This converter turns cubic inches into imperial fluid ounces instantly, using the exact factor 1 cubic inch = 0.576744024 imperial fluid ounces. 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 volume of a one-inch cube, traditional for US engine displacement. The UK fluid ounce, about 4% smaller than its US counterpart.
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
cubic inches- The amount you are converting, measured in cubic inches
0.576744024- The exact number of imperial fluid ounces in one cubic inch
imperial fluid ounces- The converted result
How it works, step by step
- Enter the number of cubic inches you want to convert.
- The value is multiplied by 0.576744024, the exact conversion factor.
- The result is displayed in imperial fluid ounces, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 cubic inches
Multiply 5 by 0.57674402. That gives 2.8837 imperial fluid ounces. A quick sanity check: one cubic inch is smaller than one imperial fluid ounce, so the number should get smaller — and it does.
Converting 72 cubic inches
72 × 0.57674402 = 41.5256 imperial fluid ounces. Working backwards, 41.5256 ÷ 0.57674402 returns 72 cubic inches, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many imperial fluid ounces are in one cubic inch?
Exactly 0.576744024. 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 cubic inches to imperial fluid ounces?
Imperial Fluid Ounces = cubic inches × 0.576744024. To reverse it, divide instead: cubic inches = imperial fluid ounces ÷ 0.576744024, which is the same as multiplying by 1.733871455.
Is the cubic inch bigger than the imperial fluid ounce?
No. One cubic inch is only 0.576744 of a imperial fluid ounce, so the imperial fluid ounce is the larger unit.
Why does my answer differ slightly from other cubic-inches to imperial-fluid-ounces 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 cubic inch?
The volume of a one-inch cube, traditional for US engine displacement.
What is a imperial fluid ounce?
The UK fluid ounce, about 4% smaller than its US counterpart.
Cubic Inches to imperial fluid ounces reference table
| Cubic Inches | Imperial Fluid Ounces |
|---|---|
| 0.5 in³ | 0.288372 fl oz |
| 1 in³ | 0.576744 fl oz |
| 2 in³ | 1.1535 fl oz |
| 3 in³ | 1.7302 fl oz |
| 5 in³ | 2.8837 fl oz |
| 10 in³ | 5.7674 fl oz |
| 15 in³ | 8.6512 fl oz |
| 20 in³ | 11.5349 fl oz |
| 25 in³ | 14.4186 fl oz |
| 50 in³ | 28.8372 fl oz |
| 75 in³ | 43.2558 fl oz |
| 100 in³ | 57.6744 fl oz |
| 250 in³ | 144.186 fl oz |
| 500 in³ | 288.372 fl oz |
| 1000 in³ | 576.744 fl oz |
Exact factor: 1 cubic inch = 0.576744024 imperial fluid ounces. Values rounded for display.