fl oz to mL Converter
Convert US fluid ounces to milliliters for cooking, beverages, and nutrition labels.
How It Works
Formula: fl oz to mL = value × 29.5735296
Example: 8 fl oz = 236.588237 mL
Note: 1 US fluid ounce equals 29.5735 milliliters, the standard for American beverage and recipe volumes.
Common Uses
Quick Conversion Table
| fl oz | mL |
|---|---|
| 0.5 | 14.7868 |
| 1 | 29.5735 |
| 2 | 59.1471 |
| 4 | 118.2941 |
| 8 | 236.5882 |
| 16 | 473.1765 |
| 32 | 946.3529 |
| 64 | 1893 |
Rounding Rule
Rounded to 4 decimal places
Error Margin
±0.01 mL
Precision Guidance
For cooking, round to whole mL. For nutrition labels, keep 1 decimal.
Common Mistakes
Fluid ounces measure volume, not weight. Do not confuse fl oz with the avoirdupois ounce (28.35 g).
Frequently Asked Questions
What is 1 fl oz in mL?
1 US fluid ounce equals 29.5735 milliliters (1 fl oz = 29.5735296 mL).
How do I convert fl oz to mL?
Multiply the fluid ounce value by 29.5735. For example, 8 fl oz × 29.5735 = 236.59 mL.
Is this the US or imperial fluid ounce?
This uses the US fluid ounce (29.57 mL). The imperial fluid ounce (28.41 mL) is slightly smaller.
How many mL in a cup?
1 US cup is 8 fl oz, which equals 236.59 mL using this conversion.
Deep Dive Guide
Fluid Ounces to mL: Convert US Liquid Volume to Metric
Convert fluid ounces to mL with the exact US formula (1 fl oz = 29.5735 mL). Covers drinks, recipes, and skincare for everyday American use.
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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