This converter turns US quarts into imperial gallons instantly, using the exact factor 1 US quart = 0.2081685462 imperial gallons. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
A quarter of a US gallon, just under one litre. Exactly 4.54609 litres, about 20% larger than the US gallon.
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
US quarts- The amount you are converting, measured in US quarts
0.2081685462- The exact number of imperial gallons in one US quart
imperial gallons- The converted result
How it works, step by step
- Enter the number of US quarts you want to convert.
- The value is multiplied by 0.2081685462, the exact conversion factor.
- The result is displayed in imperial gallons, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 US quarts
Multiply 5 by 0.20816855. That gives 1.0408 imperial gallons. A quick sanity check: one US quart is smaller than one imperial gallon, so the number should get smaller — and it does.
Converting 72 US quarts
72 × 0.20816855 = 14.9881 imperial gallons. Working backwards, 14.9881 ÷ 0.20816855 returns 72 US quarts, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many imperial gallons are in one US quart?
Exactly 0.2081685462. 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 US quarts to imperial gallons?
Imperial Gallons = US quarts × 0.2081685462. To reverse it, divide instead: US quarts = imperial gallons ÷ 0.2081685462, which is the same as multiplying by 4.803799702.
Is the US quart bigger than the imperial gallon?
No. One US quart is only 0.208169 of a imperial gallon, so the imperial gallon is the larger unit.
Why does my answer differ slightly from other quarts to imperial-gallons 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 US quart?
A quarter of a US gallon, just under one litre.
What is a imperial gallon?
Exactly 4.54609 litres, about 20% larger than the US gallon.
Us Quarts to imperial gallons reference table
| Us Quarts | Imperial Gallons |
|---|---|
| 0.5 qt | 0.104084 gal |
| 1 qt | 0.208169 gal |
| 2 qt | 0.416337 gal |
| 3 qt | 0.624506 gal |
| 5 qt | 1.0408 gal |
| 10 qt | 2.0817 gal |
| 15 qt | 3.1225 gal |
| 20 qt | 4.1634 gal |
| 25 qt | 5.2042 gal |
| 50 qt | 10.4084 gal |
| 75 qt | 15.6126 gal |
| 100 qt | 20.8169 gal |
| 250 qt | 52.0421 gal |
| 500 qt | 104.0843 gal |
| 1000 qt | 208.1685 gal |
Exact factor: 1 US quart = 0.2081685462 imperial gallons. Values rounded for display.