Convert fluid ounces to milliliters instantly. Uses the exact NIST-defined factor — free, accurate, no sign-up.
Quick Answer: One US fluid ounce equals exactly 29.5735 milliliters. Multiply any fl oz value by 29.5735 to get ml. For example: 4 oz = 118.29 ml · 8 oz = 236.59 ml · 16 oz = 473.18 ml · 32 oz = 946.35 ml.
Formula: ml = fl oz × 29.5735295625
Milliliters = Fluid Ounces × 29.5735295625
Fluid Ounces = Milliliters ÷ 29.5735295625
29.5735295625 ml is the exact legal definition of the US fluid ounce — established by international agreement and maintained by NIST. It is not a rounded approximation. When accuracy matters (medicine, lab work, professional baking), always use the full factor.
| Fluid Ounces (fl oz) | Milliliters (ml) | US Equivalent | Common Container |
|---|---|---|---|
| 0.5 fl oz | 14.787 ml | 1 tablespoon | medicine dose cup |
| 1 fl oz | 29.574 ml | 2 tablespoons | shot glass |
| 2 fl oz | 59.147 ml | ¼ cup | — |
| 4 fl oz | 118.294 ml | ½ cup | yogurt pot |
| 6 fl oz | 177.441 ml | ¾ cup | — |
| 8 fl oz | 236.588 ml | 1 cup | coffee mug |
| 10 fl oz | 295.735 ml | 1¼ cups | — |
| 12 fl oz | 354.882 ml | 1½ cups | soda / beer can |
| 16 fl oz | 473.176 ml | 1 pint / 2 cups | standard water bottle |
| 20 fl oz | 591.471 ml | 2½ cups | vending machine bottle |
| 24 fl oz | 709.765 ml | 3 cups | sport bottle |
| 32 fl oz | 946.353 ml | 1 quart / 4 cups | Nalgene / mason jar |
| 40 fl oz | 1,182.941 ml | 5 cups | — |
| 64 fl oz | 1,892.706 ml | ½ gallon / 8 cups | half-gallon jug |
| 128 fl oz | 3,785.412 ml | 1 gallon / 16 cups | gallon jug |
Recipes often call for fractional cups. This table maps them directly to ml so you can use a metric measuring jug without recalculating.
| Recipe Measure | Fluid Ounces | Milliliters (ml) |
|---|---|---|
| 1 teaspoon | 0.167 fl oz | 4.929 ml |
| 1 tablespoon | 0.5 fl oz | 14.787 ml |
| ⅛ cup | 1 fl oz | 29.574 ml |
| ¼ cup | 2 fl oz | 59.147 ml |
| ⅓ cup | 2.667 fl oz | 78.863 ml |
| ½ cup | 4 fl oz | 118.294 ml |
| ⅔ cup | 5.333 fl oz | 157.725 ml |
| ¾ cup | 6 fl oz | 177.441 ml |
| 1 cup | 8 fl oz | 236.588 ml |
These are the real-world containers people most often need to convert. Knowing the ml equivalent means you can substitute containers or scale recipes without measuring from scratch.
| Container | Labeled Size | Milliliters | Notes |
|---|---|---|---|
| Shot glass (US) | 1.5 fl oz | 44.36 ml | standard bar pour |
| Espresso shot | 1 fl oz | 29.57 ml | single; double = 59 ml |
| Mini water bottle | 8 fl oz | 236.59 ml | kids' lunch size |
| Standard water bottle | 16.9 fl oz | 500 ml | 500 ml is the labeled size |
| Sport bottle | 24 fl oz | 709.76 ml | common gym bottle |
| Soda can | 12 fl oz | 354.88 ml | US standard can |
| Beer pint (US) | 16 fl oz | 473.18 ml | US pint glass |
| Wine pour (standard) | 5 fl oz | 147.87 ml | restaurant standard |
| Quart mason jar | 32 fl oz | 946.35 ml | wide-mouth canning jar |
Why 16.9 oz = 500 ml: Bottled water is produced in metric volumes. A 500 ml bottle is labeled "16.9 fl oz" because 500 ÷ 29.5735 = 16.907, rounded to one decimal. The metric volume is primary — the fl oz is the converted label.
The US and UK both use "fluid ounce" but the volumes differ. This creates silent errors when following international recipes or purchasing imported products.
| Measure | US fl oz → ml | UK fl oz → ml | Difference |
|---|---|---|---|
| 1 fl oz | 29.574 ml | 28.413 ml | 1.16 ml |
| 4 fl oz | 118.294 ml | 113.652 ml | 4.64 ml |
| 8 fl oz | 236.588 ml | 227.305 ml | 9.28 ml |
| 16 fl oz | 473.176 ml | 454.609 ml | 18.57 ml |
| 32 fl oz | 946.353 ml | 909.218 ml | 37.13 ml |
A UK recipe calling for 8 fl oz of milk needs 227 ml — not the 237 ml a US cup holds. For baking that difference can change the texture of a batter. When in doubt, use grams or ml as specified and ignore the fl oz label. For the full picture of US measurement units, our liquid measurement conversion chart covers every unit relationship.
When you need a fast mental estimate, these shortcuts keep you close without any tools:
The exact value of 29.5735295625 ml per US fluid ounce is defined by the National Institute of Standards and Technology (NIST) — the official US measurement authority.
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