Milliliters to Fluid Ounces
Result:
Enter a volume to convert.
Convert milliliters to U.S. fluid ounces. From is set to milliliters and To is set to fluid ounces. The result updates as you type. One U.S. fluid ounce is exactly 29.5735295625 milliliters. Liters, cups, and gallons are on the volume converter. That converter does not list fluid ounces. The other direction is fluid ounces to milliliters.
Milliliters to fluid ounces formula
NIST Handbook 44 (2024), Appendix C defines the U.S. gallon as 231 cubic inches, equal to 3.785411784 liters. A U.S. fluid ounce is 1/128 of that gallon, and also 1/8 of the U.S. cup.
1 fl oz = 3.785411784 ÷ 128 = 0.0295735295625 L = 29.5735295625 mL exactly.
Formula: fluid ounces = milliliters ÷ 29.5735295625.
The converter divides by that exact fluid ounce, then rounds the displayed result to five decimal places. This page does not use the British fluid ounce.
Example: 30 mL shows 1.01442 fl oz. 29.5735295625 mL shows 1.00000 fl oz.
Milliliters to fluid ounces reference table
Each value below is the converter result at five decimal places. Enter the same milliliters in the form above and the result should match. The 29.5735295625 mL row is one fluid ounce exactly, and 236.5882365 mL is eight fluid ounces, one cup.
| Milliliters | U.S. fluid ounces |
|---|---|
| 5 | 0.16907 |
| 15 | 0.50721 |
| 30 | 1.01442 |
| 29.5735295625 | 1.00000 |
| 50 | 1.69070 |
| 100 | 3.38140 |
| 150 | 5.07210 |
| 236.5882365 | 8.00000 |
| 250 | 8.45351 |
| 355 | 12.00398 |
| 500 | 16.90701 |
| 750 | 25.36052 |
| 1000 | 33.81402 |
Milliliters to fluid ounces examples
A tablespoon: 15 mL, the nutrition-label tablespoon in 21 CFR 101.9(b)(5)(viii), is 0.50721 fl oz.
Near one ounce: 30 mL is 1.01442 fl oz, not a flat 1 fl oz. One fluid ounce is 29.5735295625 mL and displays as 1.00000 fl oz.
A can: 355 mL is 12.00398 fl oz. Twelve U.S. fluid ounces are 354.88235 mL on the fluid ounces to milliliters page.
Quick mental math (approximation)
To estimate fluid ounces, divide the milliliters by 30. Example: 30 mL ÷ 30 is about 1 fl oz. The exact result is 1.01442 fl oz.
This shortcut is an approximation. It runs about 1.4 percent low. Use the converter or the exact formula for bottles, recipes, or records.
Milliliters to fluid ounces FAQ
How many fluid ounces are in a milliliter?
One milliliter is 1 ÷ 29.5735295625 U.S. fluid ounces. The converter shows 0.03381 fl oz for 1 mL. Thirty milliliters show 1.01442 fl oz, which is a little more than one fluid ounce.
Is 30 milliliters one fluid ounce?
No. One U.S. fluid ounce is 29.5735295625 milliliters exactly and displays as 29.57353 mL. Thirty milliliters display as 1.01442 fl oz.
Does this page use the British fluid ounce?
No. It uses the U.S. fluid ounce, one-eighth of the U.S. cup and 1/128 of the U.S. gallon. NIST Handbook 44 lists the imperial gallon as 160 British fluid ounces, which is a different ounce.