Recipe Measurements: Cups, Spoons, Volume, and Weight

A measurement conversion changes units for the same quantity. Replacing an ingredient changes the recipe. Before doing either, read the recipe’s measurement notes and use any supplied gram amounts. The cooking measurements hub brings together ingredient estimates, volume tools, mass tools, and oven settings.

Identify the cup convention

NIST’s customary factors give about 236.6 mL per US customary cup, 14.8 mL per tablespoon, and 4.93 mL per teaspoon. These are rounded descriptions of customary factors.

FDA household-measure guidance uses a 240 mL cup, 15 mL tablespoon, and 5 mL teaspoon for nutrition labeling. That scope does not identify the cup in an unrelated baking chart.

The NSW Health cookbook, page 39 specifies a 250 mL metric cup, 20 mL tablespoon, and 5 mL teaspoon. A 20 mL tablespoon is one-third larger than a 15 mL spoon, calculated from those amounts. Do not silently substitute one convention for another.

A country’s name alone may not resolve an individual recipe’s conventions. Use the author’s stated units or ask for clarification. This guide does not assign an unverified modern UK tablespoon size.

Separate volume and mass

For mL to cups, both sides measure volume; ingredient density is irrelevant. The site tool uses the customary US cup. If the recipe specifies a 250 mL cup, dividing its volume by 250 mL is a different calculation.

For grams to ounces, both sides measure mass. This works for flour, milk, oil, and other ingredients without a density assumption. A fluid ounce is a volume unit and must not be substituted for a mass ounce.

For cups or spoons to grams, use the selected ingredient’s author reference and preparation. Our cups-to-grams guide explains why these results are estimates. For mL to mass, an independently verified density is required; water’s approximate kitchen relationship cannot be applied to every liquid.

Scale quantities consistently

If a recipe serves four and you need twelve portions, the arithmetic scale factor is three. Multiply the listed quantities by three while preserving their units. Unit conversion can happen before or after that multiplication if the same factor and convention are used.

That quantity calculation does not establish a new cooking time, oven mode, pan size, or ingredient substitution. Check the recipe author’s directions for those decisions.

Ingredient substitutions need recipe guidance

A cups-to-grams conversion cannot verify that oil replaces butter, honey replaces sugar, or milk plus acid replaces buttermilk in a particular recipe. This guide does not offer unverified substitution ratios. Use a tested substitution instruction from the recipe author, including any changes to other ingredients and preparation.

For oven units, use the oven temperature guide and distinguish exact arithmetic from a rounded setting supplied by the recipe.