Type into any field and every other US customary cooking measure updates — all derived from the same exact US gallon this site’s other converters already use.
US customary, not metric
This converts US customary cooking measures specifically, not the metric “cup” some countries use, which is a different, rounder 250 mL. A US cup (236.59 mL) and a metric cup (250 mL) differ by about 5.7% — small enough to not matter in a forgiving recipe, large enough to matter in baking, where ratios are exact. This calculator doesn’t attempt to guess which “cup” a given recipe means; it converts the US customary measures consistently throughout.
How to use this calculator
- Type a quantity into any field.
- The rest update — teaspoons, tablespoons, fluid ounces, cups and millilitres up front; pints, quarts and gallons behind “More units”.
Frequently asked questions
Why are 3 teaspoons always exactly 1 tablespoon?
Because that ratio is how the US tablespoon is defined relative to the teaspoon — it isn’t an approximation that happens to work out closely, it’s exact by definition, which is why the standard kitchen equivalence holds with no rounding at all.
Is a UK tablespoon the same as a US tablespoon?
No — a UK (imperial) tablespoon is a different, slightly larger volume. This calculator handles US customary measures only; converting to or from imperial UK measures needs a different conversion factor.
Why does a recipe sometimes say “cup” and sometimes give weight in grams?
Weight is more precise and repeatable — the same volume of a packed versus loose ingredient can weigh meaningfully different amounts, while a gram is a gram regardless of how it’s packed. Professional and baking-focused recipes increasingly favour weight for exactly this reason.
How many cups are in a gallon?
16, exactly — a gallon is 4 quarts, each quart is 2 pints, each pint is 2 cups, so 4×2×2 = 16.
Does a fluid ounce weigh one ounce?
Only for a substance with roughly the density of water — a fluid ounce is a unit of volume, an ounce is a unit of weight, and the two coincide closely for water but diverge for anything denser or lighter, like honey or oil.
