Cooking Measurement Converter

Cooking recipes around the world use two dominant measurement systems for liquids and semi-liquids: the US customary system (cups, tablespoons, teaspoons, fluid ounces) and the metric SI system (millilitres, litres). A third system — British Imperial — uses cups, tablespoons, teaspoons, and fluid ounces that are defined differently from their US equivalents, which is a frequent source of confusion when following UK recipes. Understanding which system a recipe uses is the first and most important step before any conversion.

This converter works by expressing every unit as an exact number of millilitres, then forming a simple ratio. For example, one US cup equals 236.588 mL, one US tablespoon equals 14.787 mL, and one US teaspoon equals 4.929 mL. To convert from one unit to another, the input quantity is multiplied by the ratio of the two conversion factors. The formula V_out = V_in × (F_in ÷ F_out) captures this relationship precisely. Because all conversion factors are anchored to millilitres, the converter can handle any pair of units without needing a separate conversion table for every combination.

Practical applications include scaling recipes up or down for different serving sizes, adapting American recipes for metric kitchens (and vice versa), converting liquid ingredients such as water, milk, oil, stock, cream, and fruit juice, and verifying measurements when two sources give different units. Note that this converter handles volume only — weight-based conversions for flour, sugar, and other dry goods require density information and are handled by a separate tool.

This calculator converts volume measurements only. Dry ingredients such as flour, sugar, oats, cocoa powder, and breadcrumbs are commonly measured by volume in recipes but vary significantly in weight per cup depending on how tightly they are packed. For dry ingredients, a kitchen scale and a grams-based recipe will always produce more consistent baking results than volume conversion alone. Additionally, the US fluid ounce (29.574 mL) and the Imperial fluid ounce (28.413 mL) differ by about 4%, so always confirm which system a recipe is using — especially for UK, Australian, or Canadian sources. Australian tablespoons are 20 mL (not 15 mL as in the US), which is not included in this tool. For very small quantities such as a pinch or a dash, volume measurement becomes impractical and a precise digital scale is recommended.