Use US fl oz for most US cup specifications
Multiply by 29.5735295625. A 10 US fl oz cup is 295.735 mL, usually described commercially as about 300 mL.
Cup capacity, without the unit guesswork
Oz to mL Converter
Enter the fluid-ounce size on a cup, bottle, or filling sheet and see the milliliter equivalent. Choose US or Imperial fl oz first—the two systems are close, but not identical.
1 US fl oz is 29.5735 mL. 1 Imperial fl oz is 28.4131 mL. For a 10 fl oz cup, that difference is about 11.6 mL.
Convert fluid ounces to milliliters
Select the measurement system printed on the specification, then enter the fluid ounces.
Milliliter result
295.7353 mL
Formula used
mL = US fl oz × 29.5735295625
Common fl oz cup sizes in milliliters
Use both columns when a supplier sheet says fl oz but does not state whether the unit is US or Imperial.
| fl oz | US fl oz → mL | Imperial fl oz → mL |
|---|---|---|
| 1 fl oz | 29.57 mL | 28.41 mL |
| 2 fl oz | 59.15 mL | 56.83 mL |
| 4 fl oz | 118.29 mL | 113.65 mL |
| 6 fl oz | 177.44 mL | 170.48 mL |
| 8 fl oz | 236.59 mL | 227.3 mL |
| 10 fl oz | 295.74 mL | 284.13 mL |
| 12 fl oz | 354.88 mL | 340.96 mL |
| 16 fl oz | 473.18 mL | 454.61 mL |
| 20 fl oz | 591.47 mL | 568.26 mL |
| 32 fl oz | 946.35 mL | 909.22 mL |
Cup names are nominal capacities. Rim-full capacity, recommended serving volume, lid clearance, ice, foam, and ingredients can all reduce the usable fill.
10 oz
= 283.5 g
10 US fl oz
= 295.7 mL
One small label check
Make sure the source means fl oz, not weight oz
Milliliters and fluid ounces both measure volume, so they convert directly. A plain oz used for net weight measures mass and needs product density before it can become a volume.
A cup marked 10 oz usually means 10 fl oz—but confirm it
Packaging catalogs often shorten a fluid-ounce capacity to “oz.” A food label or recipe may use the same letters for weight. Check the capacity field, drawing, or test report before choosing the formula.
Which conversion should you use?
The right factor comes from the market and the source specification, not from the cup material.
Use Imperial fl oz only when the source calls for it
Multiply by 28.4130625. A 10 Imperial fl oz measure is 284.131 mL.
Test the usable fill, not only the nominal number
Leave room for the lid, movement, ice, foam, toppings, or expansion. A nominal 300 mL cup is not always meant to be filled with 300 mL of product.
How to check a cup size before ordering samples
- 1
Confirm that the source unit is fluid ounces and identify US or Imperial.
- 2
Enter the fl oz value and keep enough decimal precision for the job at hand.
- 3
Compare the result with the cup drawing and run a real fill test with the intended lid and headspace.
Questions people ask when converting oz to mL
How many mL are in 1 oz?
If oz means a US fluid ounce, 1 fl oz equals 29.5735295625 mL. One Imperial fl oz equals 28.4130625 mL.
How many mL is 10 oz?
10 US fl oz equals 295.735 mL. 10 Imperial fl oz equals 284.131 mL. Confirm the system before ordering a cup.
Are US and Imperial fluid ounces the same?
No. The Imperial fluid ounce is about 3.9% smaller than the US fluid ounce.
Can weight ounces be converted directly to mL?
No. Weight oz measures mass, while mL measures volume. You need the product density to convert between them.
Have a target fill but not the right container yet?
Tell us what the food is, how much goes in, whether it is served hot or cold, and where it will be sold. We can narrow the packaging options before you spend time on samples.