All Calculators A–Z

Project your 401(k) balance at retirement based on contributions, employer match, salary, and expected returns.

Calculate the absolute and signed difference between two numbers. Find the distance between any two values instantly.

Calculate the absolute value of any number. Determine whether a number is negative and find its magnitude instantly.

Convert between m/s², ft/s², gals, standard gravity, and other acceleration units.

Convert between acres, square feet, and square meters for land area and real estate.

Calculate depreciation using the units-of-production (activity) method based on actual usage rather than time.

Add or subtract days, weeks, months, and years from any date with automatic leap year handling.

A running-tape adding machine calculator. Enter values to get a running total, subtotals of additions and subtractions, and entry count.

Calculate monthly payments, total interest, payoff timeline, and impact of extra payments on any loan type.

Check if a person meets a minimum age requirement based on their birthdate.

Calculate the age gap in years, months, and days between two people.

Convert oven temperature and time to air fryer settings using the 25 deg F reduction and 20 pct time savings rule.

Convert between shots, jiggers, fluid ounces, pints, fifths, liters, and handles.

Generate a complete loan amortization schedule showing principal, interest, and balance for each payment period.

Convert between degrees, radians, gradians, turns, arcminutes, and arcseconds.

Calculate the present and future value of an annuity based on regular payments, interest rate, and time period.

Determine monthly withdrawal amounts from an annuity balance over a chosen payout period and return rate.

Generate present value and future value annuity factors for any interest rate and number of periods.

Area and circumference of a ring shape from outer and inner radii.

Calculate the annual percentage rate (APR) for a loan, accounting for origination fees and compound interest.

Convert a nominal interest rate to annual percentage yield (APY) and calculate earnings for any compounding frequency.

Convert between acres, hectares, square feet, square meters, square kilometers, and other area units.

Compare adjustable-rate mortgage (ARM) costs against fixed-rate mortgage payments during the initial fixed period and after rate adjustment.

Estimate body fat percentage using the U.S. Department of Defense tape-measure method.

Calculate and simplify aspect ratios for screens and images.

Estimate asphalt tonnage and volume needed for driveways, parking lots, and road surfaces.

Estimate monthly auto lease payments including depreciation and finance charges based on vehicle price, residual value, and money factor.

Calculate monthly auto loan payments for used vehicles. Compare down payments, trade-in values, and loan terms to find the best deal.

Calculate the arithmetic mean of up to four numbers.

Calculate the compound annual growth rate (CAGR) and total return of an investment to compare annualized performance across different time periods.

Calculate average velocity from initial and final velocities.

Convert between grains, drams, ounces, pounds, stones, quarters, hundredweights, and short tons.

Estimate blood alcohol concentration using the Widmark formula.

Scale recipe ingredient amounts up or down by adjusting serving sizes with precise scale factor.

Calculate network bandwidth from file size and transfer time.

Calculate the effective annual percentage rate (APR) of a loan including fees. Compare the true cost of borrowing across different loan offers.

Perform basic arithmetic — add, subtract, multiply, or divide two numbers.

Compare monthly vs bi-weekly mortgage payment frequency to see how bi-weekly payments save interest and shorten your loan term.

Calculate the bid-ask spread, spread percentage, midpoint price, and total spread cost for securities trading.

Convert between decimal and binary numbers and explore binary properties.

Discover life milestones like your 10,000th day alive and billionth second from your birthday.

Calculate Body Mass Index from height and weight to assess weight status categories.

Calculate Basal Metabolic Rate using the Katch-McArdle formula based on estimated lean body mass.

Calculate monthly boat loan payments, total interest, and see how extra payments shorten your payoff.

Calculate body fat percentage, lean body mass, and fat mass using the U.S. Navy circumference method.

Calculate body surface area using the Du Bois, Mosteller, or Haycock formula.

Determine your body frame size from wrist circumference and height.

Calculate bond price, coupon payments, and current yield. Analyze how market interest rate changes affect bond valuations.

Estimate short-term bridge loan payments and total interest for home purchase transitions.

Estimate BTU cooling or heating capacity needed for a room.

Allocate monthly income using the 50/30/20 budgeting rule for needs, wants, and savings.

Calculate monthly business loan payments including origination fees. Compare SBA and conventional loan terms.

Convert butter sticks to grams, tablespoons, cups, and ounces for baking and cooking.

Calculate the compound annual growth rate (CAGR) of an investment over a specific time period.

Calculate daily calorie needs using the Mifflin-St Jeor equation for BMR, TDEE, and weight management goals.

Estimate calories burned during exercise using metabolic equivalent (MET) values for various activities.

Calculate Canadian mortgage payments using semi-annual compounding as required by Canadian banking law.

Volume and surface area of a capsule shape.

Calculate monthly car loan payments, total interest, and see how extra payments or different terms affect your auto financing.

Calculate monthly car loan payments including sales tax. Factor in vehicle price, down payment, and tax rate.

Calculate daily carbohydrate intake in grams and calories based on your total caloric needs and desired macronutrient ratio.

Calculate credit card cash back rewards, net earnings after annual fees, and break-even spending.

Compare cash back rebate versus low-interest promotional financing for vehicle purchases.

Calculate certificate of deposit earnings including APY, total interest, and maturity value for any compounding frequency.

Convert between Celsius and Fahrenheit for cooking, weather, and everyday use.

Convert between Celsius, Rankine, and Kelvin for thermodynamics and engineering.

Convert between centimeters, feet, and inches for height and length measurement.

Convert between centimeters, inches, and millimeters for sewing, crafts, and precision measurement.

Track your checkbook balance by entering deposits and withdrawals. Instantly see your new balance and transaction totals.

A register-style calculator that tracks your opening balance plus up to five transactions to compute your closing balance and net change.

Calculate circle properties — area, circumference, and diameter from radius.

Area, circumference, and diameter of a circle from its radius.

Calculate the number of ways to arrange objects in a circle using (n−1)!.

Estimate total college costs with tuition inflation projections. Calculate first-year costs and monthly savings needed for any degree program.

Find combinations with replacement using the multiset coefficient C(n+r−1, r).

Calculate sales commission earnings, total monthly compensation, and effective commission rate based on your sales and commission structure.

Explore the arithmetic relationship between two numbers — product, sum, difference.

Convert ax² + bx + c into vertex form a(x − h)² + k. Find the vertex coordinates by completing the square.

See how your money grows over time with compound interest and regular contributions.

Estimate pregnancy timeline based on weeks pregnant.

Calculate concrete volume in cubic yards and the number of bags needed for slabs, footings, and foundations.

Volume, surface area, and slant height of a cone.

Calculate the confidence interval for a population mean using sample statistics.

Volume, surface area, and slant height of a truncated cone.

Estimate interest-only payments during construction and permanent mortgage payments after conversion for new home builds.

Convert cups to milliliters, tablespoons, teaspoons, and fluid ounces for kitchen measurements.

Countdown to a specific date or event with days, hours, and weeks breakdown.

Calculate credit card payoff timeline, total interest, and total amount paid based on your balance, APR, and monthly payment.

Determine the monthly payment needed to pay off your credit card balance within a specific timeframe at any APR.

Plan multi-card debt payoff using avalanche or snowball methods. Compare total interest and payoff times for up to three cards.

Calculate the cube (x³) and cube root (∛x) of any number. Compute cubes and cube roots instantly with this free calculator.

Volume, surface area, and space diagonal of a cube.

Calculate volume in cubic feet, cubic yards, cubic meters, and liters from length, width, and height.

Calculate volume in cubic meters, cubic feet, liters, and gallons from metric dimensions.

Convert cubic yards to cubic feet, cubic meters, cubic inches, and liters for construction and landscaping.

Convert volume to weight for construction materials like gravel, sand, and topsoil.

Convert between cups, grams, tablespoons, and teaspoons for baking with water density baseline.

Convert between cups, liters, and milliliters for cooking volume measurement.

Convert between cups, milliliters, and fluid ounces for precise recipe scaling.

Convert between cups, fluid ounces, and tablespoons for liquid measurement in cooking.

Convert between cups, tablespoons, and teaspoons for precise cooking measurements.

Calculate the appreciation or depreciation of a currency over time. See total and annualized percentage change between exchange rates.

Generate a quick-reference table of converted amounts between two currencies for common denominations from 1 to 10,000 units.

Convert between world currencies with up-to-date exchange rates.

Volume, surface area, and lateral area of a cylinder.

Convert between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes using binary (1024) standards.

Convert between Mbps, MB/s, Gbps, Kbps, and calculate download times for internet speeds.

Add or subtract days, months, and years from a date, or calculate the exact difference between two dates.

Look up the day of the week, leap year status, and calendar info for any date.

Calculate the number of days, months, and years between two dates.

Calculate what the date will be after any number of days from a chosen date.

Count down the days until a specific date, event, or milestone.

Compare current debt payments against a consolidated loan to see monthly savings and total interest reduction.

Calculate how long to pay off any debt given your balance, APR, and monthly payment. View a full payoff schedule.

Calculate debt-to-equity, debt-to-assets, equity multiplier, and equity ratio from balance sheet figures.

Calculate your personal DTI ratio for mortgage and loan eligibility assessment. See housing ratio and recommended limits.

Convert decimal degrees to degrees, minutes, and seconds notation for GPS coordinates and navigation.

Convert a decimal number to a fraction approximation.

Convert decimal hours to hours, minutes, and seconds.

Calculate accumulated value during deferral and monthly payouts during distribution for a fixed deferred annuity.

Convert between density, mass, and volume with automatic unit conversions.

Calculate asset depreciation over time using straight-line, declining balance, double declining balance, or sum-of-years' digits methods.

Calculate dew point temperature from air temperature and relative humidity.

Solve diamond problems — find two numbers given their product and sum.

Factor and evaluate a² − b² using the identity (a + b)(a − b). See each squared term and both factors instantly.

Calculate the final price after applying percentage and fixed-amount discounts.

Calculate displacement using initial velocity, acceleration, and time.

Euclidean distance and midpoint between two points.

Convert between miles, kilometers, feet, meters, inches, and other length units.

Calculate asset depreciation using the DDB method with automatic switch to straight-line. View a year-by-year schedule.

Calculate how your down payment size affects monthly mortgage payments, PMI costs, and total interest paid over the life of the loan.

Estimate NFL draft pick trade value using the Jimmy Johnson chart.

Calculate mass-energy equivalence using Einstein's famous equation.

Convert a nominal interest rate to the effective annual rate based on compounding frequency to see the true annual yield.

Calculate the true cost of borrowing by factoring in upfront fees and loan charges to find the effective interest rate.

Calculate elastic potential energy stored in a spring.

Calculate monthly electricity cost from wattage, usage hours, and utility rate.

Volume and approximate surface area of an ellipsoid.

Calculate equated monthly installments for any loan. See monthly payment, total interest, and interest-to-principal ratio.

Convert between joules, calories, BTU, kilowatt-hours, and other energy units.

Calculate engine horsepower from torque and RPM.

Calculate loan payments using equal principal amortization, where each period pays the same principal amount plus declining interest.

Area, perimeter, and height of an equilateral triangle.

Convert an interest rate from one compounding frequency to another equivalent rate at any compounding interval.

Estimate monthly escrow contributions for property taxes and homeowner's insurance.

Estimate federal estate tax liability based on gross estate value, deductions, and the current federal exemption amount.

Calculate the size of the alternating group A_n = n!/2.

Calculate the result of raising a base to any exponent. Compute powers quickly with this free exponents calculator.

Calculate the factorial (n!) of any integer from 0 to 20.

Calculate daily dietary fat needs in grams and calories, including saturated and trans fat limits based on health guidelines.

Estimate your US federal income tax using simplified 2024 progressive brackets for single filers.

Convert between feet, inches, centimeters, meters, and other imperial/metric length units.

Calculate FHA loan payments including upfront and annual mortgage insurance premiums.

Compute the nth Fibonacci number using Binet's closed-form formula.

Calculate the final exam score needed to achieve your target course grade.

Calculate final velocity from initial velocity, acceleration, and time.

General-purpose financial calculator that computes future value, total interest, and effective annual rate from present value and compounding frequency.

Estimate flooring material in square feet with waste factor for hardwood, laminate, and tile installations.

Multiply two binomials (a+b)(c+d) using FOIL — First, Outer, Inner, Last. See each step and the final product.

Convert between newtons, pound-force, kilogram-force, dynes, and kips for engineering and physics.

Project forex trading account growth with compounding monthly returns, optional recurring deposits, and total gain analysis.

Evaluate x^(a/b) — a base raised to a fractional exponent. See the decimal exponent and computed result instantly.

Add, subtract, multiply, and divide fractions and see the result as decimal and fraction.

Convert between miles per gallon (MPG), liters per 100km, and km per liter for vehicle fuel efficiency comparison.

Calculate fuel cost for a trip based on distance, MPG, and gas price.

Calculate the future value of your savings or investments, with or without additional periodic contributions.

Calculate the future value of a series of equal periodic payments compounded at a specified interest rate over time.

Calculate the future value of a series of unequal cash flows compounded at a given annual rate over successive periods.

Calculate the future value of a lump-sum investment with compound interest based on present value, rate, time, and compounding frequency.

Calculate GDP using the expenditure approach: C + I + G + NX.

Discover what generation you were born into based on your birth year.

Estimate glomerular filtration rate using the CKD-EPI 2021 race-free equation to assess kidney function and CKD staging.

Convert between troy ounces, grams, pennyweights, and grains for precious metal trading and jewelry.

Calculate golden ratio proportions, segments, and golden rectangle dimensions.

Track time elapsed since the latest US government shutdown.

Convert grams to tablespoons, teaspoons, and milliliters using water-density equivalence.

Calculate gravel volume in cubic yards and tons needed for driveways, paths, and landscaping projects.

Calculate gravitational potential energy from mass, height, and gravity.

Find the greatest common factor (GCF) of two numbers.

Calculate total gross pay for hourly employees including regular and overtime wages based on hourly rate, hours worked, and overtime multiplier.

Calculate radioactive decay, remaining quantity, and elapsed half-lives.

Calculate the feels-like temperature from air temperature and humidity.

Convert heights between centimeters, meters, inches, and feet.

Calculate available credit and interest-only payments for a home equity line of credit.

Volume and surface area of a hemisphere.

Convert between frequency (hertz) and time period (seconds, milliseconds, microseconds) for electronics and physics.

Calculate available home equity and loan-to-value ratio based on home value and mortgage balance.

Calculate spring force from spring constant and displacement.

Convert watts to mechanical, metric, and boiler horsepower.

Convert your hourly wage to weekly, biweekly, monthly, and annual salary equivalents.

Add or subtract time values in hours, minutes, and seconds format.

Estimate how much house you can afford based on your income, debts, and down payment using the 28/36 debt-to-income rule.

Calculate how many months it takes to reach a savings goal with regular monthly contributions and compound interest.

Calculate how many months your retirement savings will last with regular withdrawals adjusted for investment returns and inflation.

Calculate your exact age in years, months, days, and hours from your birthdate.

Solve PV = nRT for any unknown variable.

Estimate your ideal body weight using four established anthropometric formulas: Devine, Robinson, Miller, and Hamwi.

Calculate impulse from force and time duration.

Calculate impulse from mass and change in velocity.

Calculate the effect of inflation on purchasing power and future costs over time.

Calculate simple and compound interest earned or paid on a principal amount over time.

Determine the interest rate needed to grow your money from a present value to a future goal over time.

Generate present value and future value interest factor tables for financial analysis and education.

Calculate interest-only mortgage payments during the initial period and fully amortizing payments after, with a complete payment schedule.

Calculate inverse trigonometric functions (arcsin, arccos, arctan) and convert between degrees and radians.

Project investment account growth with regular contributions, compounding returns, and account fee adjustments.

Estimate future investment value based on initial amount, contributions, and rate of return.

Evaluate how inflation erodes investment returns and purchasing power over time, with real vs nominal comparisons.

Project traditional IRA growth with annual contributions, employer match estimates, and tax-deferred compounding over your working years.

Calculate the internal rate of return on an investment with uniform annual cash flows and optional salvage value.

Find the ISO 8601 week number for any date, or convert a week number back to its date range.

Area, perimeter, and height of an isosceles triangle.

Calculate monthly payments, total interest, and total cost for jumbo mortgages exceeding conforming loan limits.

Convert Kelvin to Celsius, Fahrenheit, Rankine, and Réaumur temperature scales for scientific and engineering applications.

Calculate kinetic energy from mass and velocity.

Calculate monthly payments and total cost for raw or improved land purchases.

Compute base^exponent for large powers. See the result and the number of digits in the answer.

Solve triangle sides or angles using the law of cosines.

Plan layaway purchases by calculating periodic payment amounts, service fees, and total cost for interest-free installment plans.

Calculate lean body mass, fat mass, and body fat percentage using the Boer equation for body composition analysis.

Estimate monthly lease payments for equipment or property using the capitalized cost, residual value, and money factor method.

Calculate the least common multiple (LCM) of two numbers.

Calculate annual savings from switching to LED bulbs.

Compute key liquidity ratios — current ratio, quick ratio, and cash ratio — to assess a company's short-term financial health.

Calculate the final sale price, savings amount, and effective discount after applying one or two successive markdown percentages to a list price.

Calculate monthly payments, total interest, and total cost for any type of loan with optional extra payments.

Calculate logarithms in any base — common, natural, binary, and custom.

Perform long division with quotient, remainder, and decimal result.

Convert lumens to watts based on bulb type and efficacy.

Calculate daily macronutrient targets in grams for protein, carbohydrates, and fat from your calorie goal and desired macro split.

Calculate gross margin, operating margin, or net profit margin for your product or business.

Calculate selling price, markup percentage, and profit from cost and desired markup or target price.

Compare the tax impact of filing jointly versus separately using simplified US federal brackets to identify a marriage penalty or bonus.

Calculate mass from force and acceleration using F = ma.

Calculate the mean, median, mode, and range of any data set.

Calculate the mean (average) and range of up to 5 numbers.

Midpoint coordinates and segment length between two points.

Calculate electric vehicle efficiency in miles per kilowatt-hour.

Convert between standard 12-hour and military 24-hour time formats.

Instantly convert between millions, billions, and trillions with comma-formatted results for financial reporting and analysis.

Convert milliliters to grams, fluid ounces, and tablespoons using water-density equivalence.

Calculate the remainder of division with quotient and divisibility check.

Calculate solution molarity from moles and volume.

Calculate linear momentum from mass and velocity.

Convert between kilogram-meters per second, newton-seconds, pound-feet per second, and slug-feet per second.

Add, subtract, and count money by entering quantities of each bill and coin denomination to compute a grand total.

Estimate earnings on a money market account with tiered interest, initial deposit, and optional monthly contributions.

Calculate your full monthly mortgage payment from home price, including principal, interest, taxes, insurance, and PMI.

Calculate monthly mortgage payments with principal, interest, taxes, and insurance breakdowns.

See how extra payments accelerate your mortgage payoff date and reduce total interest paid over the life of your loan.

Evaluate whether buying mortgage discount points is worth it by comparing payments with and without points and finding the break-even period.

Calculate Miles Per Gallon equivalent for electric vehicles.

Estimate mulch volume in cubic yards and bags needed for garden beds and landscaping areas.

Find the first several multiples of a number and check if a target is a multiple.

Project mutual fund investment growth after accounting for expense ratios, front-end loads, and annual contributions over time.

Calculate the net present value of an initial investment plus up to five periodic cash flows at a given discount rate.

Convert an effective annual rate back to the nominal (stated) rate for any compounding frequency using the inverse compound interest formula.

Generate arithmetic and geometric sequence terms, find the nth term, and calculate sums.

Count odd permutations in the symmetric group S_n — the coset of A_n.

Convert between probability and odds formats including American moneyline.

Calculate current and power from voltage and resistance using Ohms Law.

Estimate your one-repetition maximum using the Epley and Brzycki equations, plus training zone percentages for progressive overload programming.

Measure business operational efficiency with asset turnover, inventory turnover, receivables turnover, and payables turnover ratios.

Convert ounces to grams, kilograms, and pounds for kitchen weight measurements.

Convert oven temperatures between Fahrenheit, Celsius, Gas Mark, and Kelvin.

Calculate overtime pay based on hourly rate, regular hours, overtime hours, and the applicable overtime multiplier.

Estimate your ovulation day, fertile window, and next period based on menstrual cycle length and luteal phase physiology.

Calculate the p-value from a z-score or test statistic for hypothesis testing.

Calculate running or walking pace, finish time, and speed from distance and time.

Calculate gallons of paint needed for walls, accounting for coats and window and door openings.

Area, perimeter, and diagonals of a parallelogram.

Calculate the impact of a salary raise across annual, monthly, biweekly, and weekly pay periods.

Determine how long it takes for an investment or project to recoup its initial cost through annual cash flows.

Estimate defined-benefit pension income based on final average salary, years of service, and benefit multiplier.

Calculate the percent error between an experimental and theoretical value. Find the absolute and relative error instantly.

Calculate percentages instantly — find what percent of a number is.

Calculate the percentage change between two values.

Estimate menstrual cycle phases including next period day, ovulation timing, follicular phase, and luteal phase length from cycle and period duration.

Calculate permutations (nPr) and combinations (nCr) for counting problems.

Calculate ordered sequences with repetition using n^r.

Find the probability and odds of any standard poker hand rank.

Convert pounds to cups, tablespoons, and milliliters using water-density equivalence.

Convert between watts, kilowatts, horsepower, BTU/hour, and other power units.

Calculate pixels per inch for any screen or display resolution.

Estimate recommended gestational weight gain based on pre-pregnancy BMI using IOM 2009 guidelines.

Calculate the present value of a future sum of money given a discount rate and time period.

Calculate the present value of a stream of equal periodic payments discounted at a given interest rate.

Convert between PSI, bar, atmospheres, pascals, mmHg, and other pressure units.

Calculate price per square foot for real estate purchases, rentals, and property comparisons with market benchmarking.

Analyze the prime factor properties of any integer from 2 to 10,000.

Calculate basic probability, odds, and expected outcomes for single events.

Calculate gross profit, net profit, and profit margins from revenue and cost data.

Calculate return on equity, return on assets, and return on invested capital from financial statements.

Calculate annual property tax and monthly estimates based on assessed value and tax rate.

Calculate daily protein requirements adjusted for body weight, physical activity level, and fitness goal using evidence-based intake multipliers.

Volume, surface area, and slant height of a square pyramid.

Calculate the missing side of a right triangle using a² + b² = c².

Solve quadratic equations ax² + bx + c = 0 using the quadratic formula. Find roots, discriminant, and vertex instantly.

Convert quarts to cups, pints, fluid ounces, and milliliters for liquid volume.

Solve proportions and work with ratios.

Area, perimeter, and diagonal of a rectangle.

Volume, surface area, and space diagonal of a box.

Compare your current mortgage against a new loan to determine monthly savings, break-even period, and total interest cost of refinancing.

Area, perimeter, and interior angles of any regular polygon.

Calculate how much rent you can afford based on your monthly income using the 30% rule and custom thresholds.

Compare the long-term costs of renting versus buying a home over your chosen time horizon.

Analyze rental property investment returns with cap rate, cash-on-cash return, and monthly cash flow projections.

Calculate how much you need to save per year to reach your retirement goal based on current savings and expected returns.

Estimate reverse mortgage (HECM) proceeds and monthly payouts based on age, home value, and interest rate.

Calculate the original pre-tax price from a total amount that includes sales tax.

Area, perimeter, and diagonals of a rhombus.

Calculate the hypotenuse, area, and perimeter of a right triangle.

Calculate required minimum distributions from traditional IRA and 401(k) accounts based on IRS life expectancy tables.

Calculate fill material volume in cubic yards and tons for road base, grading, and site preparation.

Calculate return on investment, annualized ROI, and total gain from initial and final investment values.

Convert between Arabic numbers (1–3999) and Roman numerals with digit-by-digit breakdown.

Calculate roof area and roofing squares from dimensions and pitch for material estimation.

Calculate square roots, cube roots, and nth roots of any positive number.

Project Roth IRA growth with tax-free compounding, annual contributions, and after-tax comparison to traditional accounts.

Estimate how long it takes to double your money using the Rule of 72, with exact doubling time comparison.

Calculate how inflation erodes your purchasing power and what salary you need to maintain your current standard of living.

Convert your annual salary to an equivalent hourly wage, weekly pay, and monthly pay.

Calculate the final sale price after applying a percentage discount, including savings and effective price per unit.

Calculate sales tax amount and total price for any purchase based on your tax rate.

Calculate the required sample size for surveys and studies.

Calculate how your savings will grow over time with regular monthly deposits and compound interest.

Determine how much to save each month to reach your financial goal by a target date.

Convert between scientific notation and standard form.

Estimate monthly payments and total interest on a second mortgage loan.

Calculate India's Goods and Services Tax (GST) on services at standard, reduced, and zero rates with input tax credit.

Convert US shoe sizes to UK, EU, and centimeters.

Calculate interest earned using the simple interest formula (principal × rate × time).

Calculate the future value of a Systematic Investment Plan (SIP) with regular monthly investments and compound growth.

Calculate optimal bedtimes based on wake-up time and sleep cycles.

Calculate the slope, rise, run, and distance between two points.

Estimate Social Security retirement benefits based on average indexed monthly earnings and claiming age.

Find the exponent n in x^n = y. Uses logarithms to solve n = ln(y)/ln(x) with verification.

Convert between mph, km/h, knots, m/s, Mach, and other speed units.

Calculate speed, distance, or time using the fundamental motion equation.

Volume, surface area, diameter, and circumference of a sphere.

Calculate the square (x²) and square root (√x) of any number. Enter a value to see both results instantly.

Area, perimeter, and diagonal of a square.

Calculate area in square feet, square meters, square yards, and acres from length and width.

Dedicated converter for square meters and square feet — ideal for real estate listings.

Area and perimeter of a stadium (discorectangle) shape.

Calculate the number of risers, treads, actual riser height, and total run for a staircase.

Calculate the population standard deviation, variance, and mean.

Calculate population and sample standard deviation with step-by-step workings.

Calculate basic statistics for up to 5 values including mean, sum, range.

Comprehensive statistics toolkit for mean, median, mode, range, and more.

Estimate calories burned from step count using body weight and stride length for walking exercise.

Convert step count to distance in miles and kilometers using your stride length for accurate walking and running tracking.

Calculate the average cost per share when buying stocks at different prices through dollar-cost averaging.

Calculate key stock valuation ratios including P/E, P/B, dividend yield, and earnings yield for equity analysis.

Add or subtract stopwatch lap times in minutes and seconds.

Calculate monthly student loan payments, total interest, and payoff timeline for federal and private student loans.

Explore day-of-year position and seasonal day length information for any date.

Calculate the surface area of common 3D shapes: cube, prism, sphere, cylinder.

Convert tablespoons to teaspoons, milliliters, and fluid ounces for precise measurements.

Estimate your take-home pay after federal income tax, Social Security, Medicare, and state tax deductions.

Calculate tank capacity in gallons and liters for cylindrical, rectangular, and spherical tanks.

Calculate target heart rate zones for exercise using the Karvonen method.

Calculate Total Daily Energy Expenditure using the Harris-Benedict Revised equation with physical activity level multipliers.

Convert teaspoons to grams, tablespoons, and milliliters using water-density equivalence.

Convert between Celsius, Fahrenheit, Kelvin, Rankine and Réaumur temperature scales.

Calculate how many tiles you need for a room, including a waste factor for cuts and breakage.

Calculate total weekly hours and pay from time card entries.

Convert between milliseconds, seconds, minutes, hours, days, weeks, months and years.

Convert hours, minutes, and seconds to decimal time format.

Calculate tip amount, total bill, and per-person cost when splitting the check.

Calculate tire diameter, circumference, and revolutions per mile.

Convert between newton-meters, foot-pounds, inch-pounds, and kilogram-centimeters for mechanical engineering.

Calculate triangle area, perimeter, height, and inradius from three side lengths using Heron's formula.

Solve any triangle given three sides using Heron's formula.

Volume and surface area of a triangular prism.

Calculate sine, cosine, tangent, and other trigonometric functions for any angle.

Convert between troy pounds, troy ounces, pennyweights, and grains for precious metals and gemstone trading.

Volume and surface area of a hollow cylinder.

Calculate monthly mortgage repayments, total interest, and view a full amortization schedule for UK property purchases.

Solve kinematic equations for uniformly accelerated motion.

Calculate the unit rate and price per unit for comparison shopping and rate analysis.

Calculate USDA loan payments including upfront and annual guarantee fees.

Estimate VA loan payments including funding fee costs for eligible veterans.

Calculate Value Added Tax for any country — add VAT to a net price or extract VAT from a gross price.

Calculate final velocity from initial velocity, acceleration, and displacement.

Calculate voltage drop and percentage drop for electrical wire runs.

Convert between liters, gallons, cups, milliliters, and other volume units.

Convert watts to amps for DC and single-phase AC circuits using voltage and power factor inputs.

Convert watts to lumens based on bulb type and efficacy.

Calculate wavelength from wave velocity and frequency.

Convert between kilograms, pounds, ounces, grams, stone, and other weight units.

Calculate waist-to-hip ratio and assess cardiovascular health risk category based on WHO guidelines.

Calculate wind chill from air temperature and wind speed.

Calculate mechanical work from force, displacement, and angle.

Calculate weekly work hours with breaks and overtime for payroll.

Calculate the z-score (standard score) for a value given mean and standard deviation.

Calculate Z-scores to determine how many standard deviations a value is from the mean.