Cups to mL converter — US, metric, imperial & Japanese cup standards

By Fidamen-Chefsolver Team | Reviewed by Ugo Candido | Updated August 20, 2026

Convert cups and millilitres both ways and compare the US customary, US legal, metric, imperial and Japanese cup standards side by side, with baking-friendly rounding.

Cups to mL — US, metric, imperial and Japanese cup standards

Convert cups and millilitres in both directions and see how the result shifts across the US, metric, imperial and Japanese cup standards.

Direction

Amount

Cup standard

8 US fluid ounces, 236.5882365 mL. The cup almost every US recipe assumes.

Recipe context (optional)

Rounding

This only suggests a standard. Always double-check the guidance printed in the original recipe.

Result 236.588237 mL

Difference from the US customary cup This is the US customary cup, the reference every other standard is measured against.

Cups and millilitres are both units of volume, so this conversion never depends on the ingredient — a cup of water and a cup of flour hold the same millilitres. Density only matters when you turn volume into weight, such as cups to grams.

Every cup standard compared

Standard	mL per cup	Result
US customary cup selected	236.5882365	236.588237
US legal cup (nutrition labels)	240	240
Metric cup (250 mL)	250	250
Imperial cup (UK)	284.130625	284.130625
Japanese traditional cup	180	180
Japanese modern cup	200	200

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When to use this converter

Reach for this when a recipe's cups and your measuring cups follow different standards. US, metric, British imperial and Japanese cups are all different sizes, so choose the standard your recipe was written for before you convert.

Common mistakes to avoid

Assuming every “cup” is a US cup — a metric or imperial cup holds noticeably more.
Pour liquids and read the meniscus at eye level; eyeballing can be off by several millilitres.

Quick example A British recipe written before metric may mean the imperial cup, so 2 cups lands near 568 mL rather than the 473 mL a US cup gives — the comparison table shows all six side by side.

Cups to mL converter — US, metric, imperial & Japanese cup standards

Cups to mL — US, metric, imperial and Japanese cup standards

Every cup standard compared

Embed this converter

When to use this converter

Common mistakes to avoid

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