Quick takeaway: 2 US fluid ounces = 59.15 mL. For any US amount, multiply by 29.5735295625. UK Imperial fluid ounces use 28.4130625 mL instead.
oz to ml conversion chart
These results are rounded to two decimal places. Choose an amount to open the calculator with that volume filled in; switch the fluid-ounce type to compare systems.
| Fluid ounces | US fluid ounces to mL | UK Imperial fluid ounces to mL | Calculate this amount |
|---|---|---|---|
| 1 oz | 29.57 mL | 28.41 mL | Convert 1 oz |
| 2 oz | 59.15 mL | 56.83 mL | Convert 2 oz |
| 8 oz | 236.59 mL | 227.30 mL | Convert 8 oz |
| 8.5 oz | 251.38 mL | 241.51 mL | Convert 8.5 oz |
| 11 oz | 325.31 mL | 312.54 mL | Convert 11 oz |
| 16 oz | 473.18 mL | 454.61 mL | Convert 16 oz |
| 17 oz | 502.75 mL | 483.02 mL | Convert 17 oz |
| 32 oz | 946.35 mL | 909.22 mL | Convert 32 oz |
| 300 oz | 8872.06 mL | 8523.92 mL | Convert 300 oz |
How to convert oz to ml
For the US fluid ounce, multiply by 29.5735295625. For the Imperial fluid ounce, multiply by 28.4130625.
If you are starting with milliliters, use the mL to oz converter. If your problem is about 3D shape capacity instead of liquid unit conversion, use the volume calculator.
mL = fl oz * mL per fluid ounce
- Confirm you are using fluid ounces, not weight ounces.
- Choose US or Imperial fluid ounces.
- Multiply the number of fluid ounces by the correct milliliter factor.
Example for a common US cup:
8 US fl oz * 29.5735295625 = 236.588 mL
Worked example for an 8.5 oz bottle
An 8.5 US fl oz bottle holds 8.5 × 29.5735295625 = 251.37500128125 mL, or 251.38 mL rounded. An 8.5 Imperial fl oz bottle holds 8.5 × 28.4130625 = 241.51103125 mL, or 241.51 mL. Check which system the bottle uses before comparing capacities.
Evidence note: NIST's conversion table distinguishes US fluid ounces, Imperial fluid ounces, and ounces of mass. The two fluid-ounce systems produce different volumes; a mass ounce needs the substance's density to convert to mL.
Common mistakes
- Treating US and Imperial fluid ounces as interchangeable.
- Converting ounces of weight directly to milliliters without density.
- Rounding each intermediate value instead of rounding the final answer.
When the ounce type matters
US recipes, nutrition labels, and most American search results use US fluid ounces. UK recipes may use Imperial fluid ounces. If you are measuring medicine or preparing a precise formula, check the label and use the matching system.