How many grams of ground coffee should I use per cup if my scoop is a teaspoon?

The Specialty Coffee Association recommends roughly 10 grams per 6-ounce cup. One level teaspoon of ground coffee weighs about 2 grams, so you would need five teaspoons per cup. Weighing on a kitchen scale is faster once you calibrate, but the teaspoon-to-gram ratio helps when camping without a scale.

How do I figure out how many teaspoons of fertilizer to add per gallon when the bag lists grams per liter?

Divide the recommended grams-per-liter rate by 4.929 to get the teaspoon count per liter, then multiply by 3.785 to scale to a US gallon. For example, 2 grams per liter becomes roughly 0.4 teaspoons per liter, or about 1.5 teaspoons per gallon. This rough method works for granular fertilizers where scooping precision matters less than with baking.

How do I convert the teaspoon marking on a pet medication syringe to the gram dosage on the label?

Multiply the teaspoon volume by 4.929 to get the water-equivalent gram mass. If the medication is a thick paste or suspension, its actual mass per teaspoon will be higher than the water baseline. For accuracy, draw the prescribed teaspoon amount into the syringe, then weigh it on a postal scale to confirm it matches the label's gram target.

Free Teaspoons to Grams Converter — Spoon to Weight Kitchen Tool | CalculatorChef