28.4mL
UK Fluid Ounces to Milliliters
Imperial fluid ounces, exact, with the US difference spelled out.
Tip: you can type “8 oz flour” or “500 ml to oz”.
1 UK fluid ounce =
Try:
about ⅔2/3 of a 1.5 fl oz shot
Reading this as UK fluid ounces.
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Details
Weighs about 28.4 g as
All units
- mL
- 28.4
- L
- 0.0284
- UK cup
- 0.114
- UK tbsp
- 1.89
- UK tsp
- 5.68
- UK pint
- 0.05
- UK qt
- 0.025
- UK gal
- 0.00625
How we got this
1 UK fluid ounce × 28.4130625 mL/fl oz = 28.413063 mL
1 US fl oz = 29.5735295625 mL (NIST). 1 UK fl oz = 28.4130625 mL (UK Weights and Measures Act 1985).
Density used: water, 1 g/mL. By definition close to 1 g/mL at room temperature. Source: NIST.
Also useful:
The imperial fluid ounce is 28.4130625 mL. It is 1/160 of an imperial gallon, which the Weights and Measures Act 1985 fixes at 4.54609 litres. Twenty of them make a UK pint (568.26 mL), forty make a quart, and 160 make a gallon.
UK food packaging has been metric for years, so imperial ounces now turn up in old cookbooks, cocktail books and pub-measure references. If the source is American, use the US fluid ounce instead. It is about 4% larger.
Quick answers
- 1 UK fl oz
- 28.41 mL
- 1 UK pint
- 568.3 mL
- 1 UK fl oz
- 0.96 US fl oz
Formula
mL = UK fl oz × 28.4130625UK fl oz = mL ÷ 28.4130625US fl oz = UK fl oz ÷ 1.040843UK fl oz = US fl oz × 1.040843
Conversion table
| Amount | UK fl oz to mL | UK fl oz to US fl oz |
|---|---|---|
| 1 | 28.41 | 0.96 |
| 2 | 56.83 | 1.92 |
| 3 | 85.24 | 2.88 |
| 4 | 113.7 | 3.84 |
| 5 | 142.1 | 4.8 |
| 6 | 170.5 | 5.76 |
| 7 | 198.9 | 6.73 |
| 8 | 227.3 | 7.69 |
| 9 | 255.7 | 8.65 |
| 10 | 284.1 | 9.61 |
| 12 | 341 | 11.53 |
| 16 | 454.6 | 15.37 |
| 16.9 | 480.2 | 16.24 |
| 20 | 568.3 | 19.22 |
| 24 | 681.9 | 23.06 |
| 32 | 909.2 | 30.74 |
| 50 | 1,421 | 48.04 |
| 64 | 1,818 | 61.49 |
| 100 | 2,841 | 96.08 |
Which ounce?
| Ounce | Exactly | Used for |
|---|---|---|
| Ounce (oz) | 28.349523125 g | Food, mail, kitchen scales, the default meaning of a bare “oz”. |
| US fluid ounce (US fl oz) | 29.5735295625 mL | US labels, bottles, cans. 16 of them make a US pint. |
| UK fluid ounce (UK fl oz) | 28.4130625 mL | UK recipes, older imperial labels. 20 of them make a UK pint. |
| Troy ounce (oz t) | 31.1034768 g | Gold, silver, platinum. About 10% heavier than the ounce on your kitchen scale. |
Common amounts
- 8 oz cup 237 mL
- 12 oz can 355 mL
- 16.9 oz bottle 500 mL
- 20 oz bottle 591 mL
- 3.4 oz TSA 100 mL
- 1.7 oz perfume 50 mL
- 8 oz steak 227 g
- 1 oz gold 31.1 g
Questions
How many mL is a UK fluid ounce?
28.4130625 mL, usually rounded to 28.4 mL.
Why is a UK pint bigger than a US pint?
A UK pint is 20 fluid ounces and each UK ounce is slightly smaller than a US one. 20 x 28.4131 is 568.26 mL, against 16 x 29.5735 for 473.18 mL.
Has the imperial fluid ounce always been this size?
The imperial gallon dates from 1824 and has been redefined slightly since. The current value, 4.54609 litres, is the one in the Weights and Measures Act 1985. The changes were tiny, so old recipes still convert fine.
Is a UK cup 10 fluid ounces?
Some older British recipes use a 10 fl oz cup, which is 284 mL. Modern UK recipes usually mean a 250 mL metric cup, and some mean a US cup. If the recipe does not say, look for clues such as mL amounts or an American publisher.