PaperBull · Cup size reference
12oz to ml
12 US fluid ounces = 354.88 mL — about 355 mL. Using Imperial fluid ounces? The answer is 340.96 mL.
Fluid ounces to milliliters
Live converterQuick reference
Fluid oz to mL chart
Choose the column that matches the measurement system. “oz” on its own does not tell you whether the quantity is a fluid volume or a weight.
| Fluid ounces | US fluid ounces → mL | Imperial fluid ounces → mL |
|---|---|---|
| 8 fl oz | 236.59 mL | 227.30 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 |
| 24 fl oz | 709.76 mL | 681.91 mL |
These are mathematical volume conversions, not measured capacities of the products shown below.
Know your units
12oz to ml conversion formula
The US and Imperial fluid ounce are different units of volume. The converter defaults to US fluid ounces; change the selector when your recipe or specification uses Imperial units.
US fluid ounce
12 fl oz ≈ 355 mL
Multiply the number of US fluid ounces by 29.5735295625.
12 × 29.5735295625
= 354.88235475 mL
Imperial fluid ounce
12 fl oz ≈ 341 mL
Multiply the number of Imperial fluid ounces by 28.4130625.
12 × 28.4130625
= 340.95675 mL
Fluid ounces are not ounces of weight
A fluid ounce measures volume; an ounce of weight measures mass. You cannot convert 12 oz of flour, coffee beans or another ingredient to mL from the weight alone. You need its density: volume (mL) = mass (g) ÷ density (g/mL). Packing and temperature can also matter, so do not use this liquid-volume calculator as a weight converter.
From conversion to cup selection
Is a 12 oz cup 360 mL?
Not as an exact unit conversion. 12 US fluid ounces is 354.88235475 mL, not 360 mL. A product sold as a “12 oz cup” may use a nominal size name; that label is not a measurement of every cup’s capacity.
Check the rated capacity
Ask whether the supplier’s mL figure is nominal, recommended fill or brimful capacity. Do not assume they describe the same fill level.
Allow for the drink
Confirm the intended serving volume and space for foam, ice, toppings or a lid. Test the actual cup with your drink and service method.
Verify the fit
Request the selected cup’s rim diameter, height and base diameter, plus its matching lid reference. The “12 oz” name alone cannot confirm lid fit.
For more on the physical format, read the 12 oz cup size guide. Always check dimensions against the exact product you intend to order.
PaperBull paper cups
Explore 12 oz cup formats
These product pages use a nominal 12 oz size. Compare the wall construction, then confirm actual capacity, dimensions and lid compatibility for your order.
Nominal 12 oz · Single wall
Single-Wall Paper Cup
A single-wall paper cup format for your cup and sleeve specification.
View single-wall cup
Nominal 12 oz · Double wall
Double-Wall Paper Cup
A double-wall paper cup format to compare with your preferred single-wall option.
View double-wall cup
Nominal 12 oz · Kraft double wall
Kraft Double-Wall Cup
A kraft-look double-wall format for a different cup appearance.
View kraft cupConversion basis
The calculator uses 29.5735295625 mL per US fluid ounce and 28.4130625 mL per Imperial fluid ounce. It keeps the full conversion factor for calculation and rounds only the displayed result. Unit references are listed here; cup selection notes describe what to verify with the supplier, not a tested capacity claim.
- NIST Handbook 44, Appendix C: the US gallon is 3,785.411784 mL and contains 128 US fluid ounces; dividing gives the US factor used here.
- NIST Guide to the SI, Appendix B.8: reference tables distinguish fluid ounces from ounces of mass and list rounded US and Imperial conversion factors.
- UK Units of Measurement Regulations 1995, Schedule: the Imperial fluid ounce is defined as 28.4130625 millilitres.
Need a cup for your serving size?
Send your drink volume, preferred cup format and lid requirements to PaperBull.