What is a ml to oz converter?
A milliliters to ounces converter is an online tool that turns a volume measured in milliliters (mL) into its equivalent in US fluid ounces (fl oz), and back again. The milliliter is a metric unit found on most product labels worldwide, while the fluid ounce is a US customary unit common in American recipes and packaging. This converter lets you move between the two instantly.
Type a value into either field and the other updates automatically in real time — there is no button to press.
How does it work?
One milliliter equals about 0.033814 US fluid ounces, and conversely one US fluid ounce equals exactly 29.5735 milliliters. Since both units describe the same physical volume, the conversion is a single multiplication or division.
Keep in mind that the US fluid ounce differs from the UK (imperial) fluid ounce, which is about 28.4131 mL. This tool defaults to the US ounce; switch units with the selector when you need the imperial value.
Formula
To convert milliliters to US fluid ounces:
To convert US fluid ounces to milliliters:
Worked examples
Example 1: 100 milliliters to fluid ounces
So 100 mL is about 3.38 US fluid ounces — a bit more than three shots.
Example 2: 1 fluid ounce to milliliters
A single US fluid ounce therefore holds 29.5735 mL.
Conversion table
| Milliliters (mL) | Fluid ounces (US) |
|---|---|
| 10 | 0.3381 |
| 30 | 1.0144 |
| 50 | 1.6907 |
| 100 | 3.3814 |
| 250 | 8.4535 |
| 500 | 16.9070 |
| 1000 | 33.8140 |
Notes
- Everyday cooking often treats 30 mL as 1 fl oz; use the exact factor of 29.5735 mL when accuracy matters.
- Check whether a recipe or label uses US or UK ounces, as the two differ by roughly 4%.
- To convert larger volumes between liters and gallons, see the gallons to liters converter.
Frequently asked questions
How many ounces are in 100 ml?
100 milliliters equal about 3.3814 US fluid ounces.
How many ml are in 1 ounce?
There are 29.5735 milliliters in one US fluid ounce.
Does this use US or UK fluid ounces?
By default it uses US fluid ounces (29.5735 mL). You can switch to UK (imperial) ounces, which are about 28.4131 mL, with the unit selector.
How do I convert 250 ml to ounces?
Divide by 29.5735: 250 / 29.5735 ≈ 8.4535 US fluid ounces.