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Formula used
Choose the standard matching your source measurement. Multiply fluid ounces by the selected factor. Divide milliliters by that factor for reverse conversion.
How to use this calculator
- Select the required conversion direction.
- Enter the volume you want converted.
- Choose the correct fluid-ounce standard.
- Select precision and rounding preferences.
- Add optional batch values for multiple conversions.
- Press Calculate to view detailed results.
- Copy, share, or download the result.
US and UK fluid ounces differ
A US fluid ounce equals about 29.5735 milliliters. A UK fluid ounce equals about 28.4131 milliliters. Selecting the wrong standard changes every converted result.
Fluid ounces measure volume, not object weight. Ounces without “fluid” usually describe mass. Always confirm the unit before completing conversions.
Common conversion table
| Fluid ounces | US milliliters | UK milliliters | Nutrition milliliters |
|---|---|---|---|
| 1 fl oz | 29.5735 mL | 28.4131 mL | 30 mL |
| 2 fl oz | 59.1471 mL | 56.8261 mL | 60 mL |
| 4 fl oz | 118.2941 mL | 113.6523 mL | 120 mL |
| 6 fl oz | 177.4412 mL | 170.4784 mL | 180 mL |
| 8 fl oz | 236.5882 mL | 227.3045 mL | 240 mL |
| 12 fl oz | 354.8824 mL | 340.9568 mL | 360 mL |
| 16 fl oz | 473.1765 mL | 454.609 mL | 480 mL |
| 20 fl oz | 591.4706 mL | 568.2613 mL | 600 mL |
| 32 fl oz | 946.3529 mL | 909.218 mL | 960 mL |
| 64 fl oz | 1,892.7059 mL | 1,818.436 mL | 1,920 mL |
| 128 fl oz | 3,785.4118 mL | 3,636.872 mL | 3,840 mL |
Example calculations
| Example | Standard | Calculation | Result |
|---|---|---|---|
| 8 fl oz | US customary | 8 × 29.5735295625 | 236.5882 mL |
| 8 fl oz | UK imperial | 8 × 28.4130625 | 227.3045 mL |
| 240 mL | US customary | 240 ÷ 29.5735295625 | 8.1154 fl oz |
Frequently asked questions
How many milliliters are in one US fluid ounce?
One US customary fluid ounce equals 29.5735295625 milliliters.
How many milliliters are in one UK fluid ounce?
One UK imperial fluid ounce equals 28.4130625 milliliters.
Why are US and UK results different?
Each measurement system defines its fluid ounce differently.
What is a nutrition-label fluid ounce?
US nutrition labeling commonly treats one fluid ounce as 30 milliliters.
Can this calculator convert milliliters back?
Yes. Select milliliters to fluid ounces from the direction menu.
Can I convert several values together?
Yes. Enter multiple values inside the batch conversion box.
Does the calculator support scientific notation?
Yes. Inputs such as 1e3 are accepted.
Are negative volume values allowed?
No. Volume entries must be zero or greater.
Is one milliliter equal to one cubic centimeter?
Yes. One milliliter equals one cubic centimeter exactly.
How should cooking measurements be converted?
Use the standard printed by the recipe source.
Can I download my conversion results?
Yes. CSV and PDF export buttons appear after calculation.