This converter turns imperial fluid ounces into milliliters instantly, using the exact factor 1 imperial fluid ounce = 28.4130625 milliliters. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The UK fluid ounce, about 4% smaller than its US counterpart. One thousandth of a litre, equal to one cubic centimetre.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
imperial fluid ounces- The amount you are converting, measured in imperial fluid ounces
28.4130625- The exact number of milliliters in one imperial fluid ounce
milliliters- The converted result
How it works, step by step
- Enter the number of imperial fluid ounces you want to convert.
- The value is multiplied by 28.4130625, the exact conversion factor.
- The result is displayed in milliliters, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 imperial fluid ounces
Multiply 5 by 28.413062. That gives 142.0653 milliliters. A quick sanity check: one imperial fluid ounce is larger than one milliliter, so the number should get bigger — and it does.
Converting 72 imperial fluid ounces
72 × 28.413062 = 2,045.74 milliliters. Working backwards, 2,045.74 ÷ 28.413062 returns 72 imperial fluid ounces, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many milliliters are in one imperial fluid ounce?
Exactly 28.4130625. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert imperial fluid ounces to milliliters?
Milliliters = imperial fluid ounces × 28.4130625. To reverse it, divide instead: imperial fluid ounces = milliliters ÷ 28.4130625, which is the same as multiplying by 0.03519507973.
Is the imperial fluid ounce bigger than the milliliter?
Yes. One imperial fluid ounce equals 28.4131 milliliters, so it is the larger unit.
Why does my answer differ slightly from other imperial-fluid-ounces to ml converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a imperial fluid ounce?
The UK fluid ounce, about 4% smaller than its US counterpart.
What is a milliliter?
One thousandth of a litre, equal to one cubic centimetre.
Imperial Fluid Ounces to milliliters reference table
| Imperial Fluid Ounces | Milliliters |
|---|---|
| 0.5 fl oz | 14.2065 mL |
| 1 fl oz | 28.4131 mL |
| 2 fl oz | 56.8261 mL |
| 3 fl oz | 85.2392 mL |
| 5 fl oz | 142.0653 mL |
| 10 fl oz | 284.1306 mL |
| 15 fl oz | 426.1959 mL |
| 20 fl oz | 568.2613 mL |
| 25 fl oz | 710.3266 mL |
| 50 fl oz | 1,420.65 mL |
| 75 fl oz | 2,130.98 mL |
| 100 fl oz | 2,841.31 mL |
| 250 fl oz | 7,103.27 mL |
| 500 fl oz | 14,206.53 mL |
| 1000 fl oz | 28,413.06 mL |
Exact factor: 1 imperial fluid ounce = 28.4130625 milliliters. Values rounded for display.