Cooking Measurement Converter

Making sense of cups, spoons, and millilitres in the kitchen

Recipe measurement is one of the most common places unit confusion causes real, tangible problems — an over- or under-measured ingredient can throw off a bake or a sauce. This tool focuses specifically on the volume-based measurements used in cooking: teaspoons, tablespoons, cups (both US and metric), fluid ounces, pints, quarts, millilitres, and litres, so you can adapt a recipe from a different country's convention without guesswork.

US cup versus metric cup

This is the single biggest source of recipe conversion errors. A US cup, used throughout American recipes, is 240 mL. A metric cup, common in Australian, and some UK and international recipes, is 250 mL — a roughly 4% difference that's small for a single cup of liquid but compounds noticeably in recipes calling for multiple cups of an ingredient, or in baking where ratios matter more than in general cooking. Always check which convention a recipe's country of origin uses; this tool includes both explicitly labelled so you're never guessing.

Teaspoons and tablespoons aren't universal either

A US teaspoon is 4.92892 mL and a US tablespoon is 14.7868 mL (exactly 3 teaspoons). Australian tablespoons are a notable exception at 20 mL (4 teaspoons) rather than the 15 mL used almost everywhere else — if you're working from an Australian recipe and a non-Australian one side by side, tablespoon measurements are not directly interchangeable. This tool uses the standard US/UK/most-of-world 15 mL tablespoon definition.

Volume versus weight for dry ingredients

It's worth being upfront about this tool's biggest limitation: it converts volume to volume (a millilitre to a cup, a tablespoon to a fluid ounce), not volume to weight. A "cup of flour" and a "cup of sugar" contain different masses because the ingredients have different densities — converting a cup measurement into grams accurately requires an ingredient-specific density figure, which a general volume converter can't provide. For baking recipes where precision matters most, weighing dry ingredients directly on a kitchen scale (following the recipe's own gram figures, if given) is more reliable than any volume-based conversion, including this one.

Everyday uses

Home cooks adapting a recipe found online from a different country's measurement convention, people without a set of US measuring cups trying to follow a US recipe using a kitchen scale calibrated in millilitres, and anyone scaling a recipe up or down and wanting to double check that, say, "3 teaspoons" really does equal "1 tablespoon" before combining ingredients, all find this tool useful during actual meal prep.

A practical tip

When a recipe's origin is unclear, a good default assumption for "cup" is the US 240 mL standard, since it's the most widely published convention online — but if a bake doesn't turn out as expected and you suspect a metric-cup recipe, converting with the 250 mL metric cup option and comparing the two results can help identify where the discrepancy came from.

Scaling a recipe up or down

When doubling or halving a recipe, convert every ingredient into a single consistent volume unit first, scale that number, and only then convert back into whatever measuring tools you actually have on hand — this avoids the small compounding rounding errors that can happen when scaling several ingredients that were originally given in a mix of teaspoons, tablespoons, and cups.