This converter turns imperial fluid ounces into US quarts instantly, using the exact factor 1 imperial fluid ounce = 0.03002374814 US quarts. 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. A quarter of a US gallon, just under one litre.
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
0.03002374814- The exact number of US quarts in one imperial fluid ounce
US quarts- 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 0.03002374814, the exact conversion factor.
- The result is displayed in US quarts, 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 0.030023748. That gives 0.150119 US quarts. A quick sanity check: one imperial fluid ounce is smaller than one US quart, so the number should get smaller — and it does.
Converting 72 imperial fluid ounces
72 × 0.030023748 = 2.1617 US quarts. Working backwards, 2.1617 ÷ 0.030023748 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 US quarts are in one imperial fluid ounce?
Exactly 0.03002374814. 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 US quarts?
Us Quarts = imperial fluid ounces × 0.03002374814. To reverse it, divide instead: imperial fluid ounces = US quarts ÷ 0.03002374814, which is the same as multiplying by 33.30696739.
Is the imperial fluid ounce bigger than the US quart?
No. One imperial fluid ounce is only 0.0300237 of a US quart, so the US quart is the larger unit.
Why does my answer differ slightly from other imperial-fluid-ounces to quarts 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 US quart?
A quarter of a US gallon, just under one litre.
Imperial Fluid Ounces to US quarts reference table
| Imperial Fluid Ounces | Us Quarts |
|---|---|
| 0.5 fl oz | 0.015012 qt |
| 1 fl oz | 0.030024 qt |
| 2 fl oz | 0.060047 qt |
| 3 fl oz | 0.090071 qt |
| 5 fl oz | 0.150119 qt |
| 10 fl oz | 0.300237 qt |
| 15 fl oz | 0.450356 qt |
| 20 fl oz | 0.600475 qt |
| 25 fl oz | 0.750594 qt |
| 50 fl oz | 1.5012 qt |
| 75 fl oz | 2.2518 qt |
| 100 fl oz | 3.0024 qt |
| 250 fl oz | 7.5059 qt |
| 500 fl oz | 15.0119 qt |
| 1000 fl oz | 30.0237 qt |
Exact factor: 1 imperial fluid ounce = 0.03002374814 US quarts. Values rounded for display.