US Cups to mL Converter
Convert US cups to milliliters for American baking and cooking recipes.
How It Works
Formula: US cup to mL = value × 236.5882365
Example: 1 US cup = 236.588236 mL
Note: 1 US customary cup equals 236.5882365 mL for liquid cooking measurements. The FDA labeling cup uses 240 mL.
Common Uses
Quick Conversion Table
| US cup | mL |
|---|---|
| 0.5 | 118.2941 |
| 1 | 236.5882 |
| 2 | 473.1765 |
| 4 | 946.3529 |
| 8 | 1893 |
| 16 | 3785 |
| 32 | 7571 |
| 64 | 15142 |
Rounding Rule
Rounded to 4 decimal places
Error Margin
±0.01 mL
Precision Guidance
For everyday cooking, round to 240 mL per cup. For precise baking, use the exact 236.59 mL conversion.
Common Mistakes
Do not confuse US cup with metric cup (250 mL) or imperial cup. American recipes use the US customary cup (236.59 mL) which this converter implements.
Frequently Asked Questions
What is 1 US cup in mL?
1 US customary cup equals exactly 236.5882365 mL for liquid measurements. Note: The FDA nutritional labeling cup uses 240 mL.
Why are there different cup measurements?
The US customary cup (236.59 mL) is used for recipe measurements, while the FDA labeling cup (240 mL) is used on nutrition labels. This converter uses the customary standard for cooking.
Is this the right conversion for baking?
Yes, this uses the US customary cup standard (236.59 mL) used in most American cookbooks and baking recipes.
How accurate is this for cooking?
For everyday cooking, rounding to 240 mL is common. For precise baking, use the full conversion (236.59 mL) for accurate results.
Deep Dive Guide
US Cups to ML: Complete Baking and Cooking Conversion Guide
Convert US cups to milliliters for baking and cooking. Master the cups to ml conversion for accurate recipe measurements in metric.
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Exact Constants & Authoritative Sources
Every conversion on this page uses the fixed, internationally agreed constants below — drawn from NIST and the SI Brochure. No values are estimated or rounded as if exact. See the full list on our Sources & Standards page.
- EXACT1 US gallon (gal) = 3.785411784 litres (exact, 231 in³)
- EXACT1 US fluid ounce (fl oz) = 29.5735295625 mL (exact, 1/128 gal)
- EXACT1 US cup = 236.5882365 mL (exact, 8 fl oz)
- EXACT1 US pint (pt) = 473.176473 mL (exact, 16 fl oz)
- EXACT1 US quart (qt) = 946.352946 mL (exact, 32 fl oz)
- EXACT1 litre (L) = 1000 millilitres (definition)
Common Pitfalls & How to Avoid Them
US vs. Imperial (UK) cups
A US cup is 236.59 mL, but a UK/metric cup is 250 mL and an Imperial cup is ~284 mL. Recipes from different countries are not interchangeable drop-in.
Fluid ounce is volume, not mass
A US fl oz is 29.57 mL of volume. 1 fl oz of water ≈ 29.57 g, but 1 fl oz of honey or oil weighs more. Do not treat fluid ounces as grams.
Teaspoon/tablespoon sizes differ
1 US tbsp = 14.7868 mL; 1 US tsp = 4.92892 mL. Metric measuring spoons are 15 mL and 5 mL — close but not exact; for baking precision use weighed grams.
A unit-conversion reference site has no manufacturer-specific or device calibration parameters, so "layered tuning" does not apply here. The only real error-handling is input validation: the converter rejects non-numeric, empty, or out-of-range entries and shows a clear message, then falls back to exact constants above. No estimated or rounded figures are ever presented as exact.
Authoritative sources for this page
- NIST (U.S. National Institute of Standards and Technology) — NIST SP 330 — The International System of Units (SI), 2019 edition
- BIPM (International Bureau of Weights and Measures) — SI Brochure — The International System of Units (9th edition)
Last Updated 2026 | This converter was reviewed for accuracy