This converter turns US gallons into US quarts instantly, using the exact factor 1 US gallon = 4 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.
Exactly 231 cubic inches — the US liquid gallon used for fuel and milk. 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
US gallons- The amount you are converting, measured in US gallons
4- The exact number of US quarts in one US gallon
US quarts- The converted result
How it works, step by step
- Enter the number of US gallons you want to convert.
- The value is multiplied by 4, 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 US gallons
Multiply 5 by 4. That gives 20 US quarts. A quick sanity check: one US gallon is larger than one US quart, so the number should get bigger — and it does.
Converting 72 US gallons
72 × 4 = 288 US quarts. Working backwards, 288 ÷ 4 returns 72 US gallons, 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 US gallon?
Exactly 4. 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 gallons to US quarts?
Us Quarts = US gallons × 4. To reverse it, divide instead: US gallons = US quarts ÷ 4, which is the same as multiplying by 0.25.
Is the US gallon bigger than the US quart?
Yes. One US gallon equals 4 US quarts, so it is the larger unit.
Why does my answer differ slightly from other us-gallons 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 US gallon?
Exactly 231 cubic inches — the US liquid gallon used for fuel and milk.
What is a US quart?
A quarter of a US gallon, just under one litre.
Us Gallons to US quarts reference table
| Us Gallons | Us Quarts |
|---|---|
| 0.5 gal | 2 qt |
| 1 gal | 4 qt |
| 2 gal | 8 qt |
| 3 gal | 12 qt |
| 5 gal | 20 qt |
| 10 gal | 40 qt |
| 15 gal | 60 qt |
| 20 gal | 80 qt |
| 25 gal | 100 qt |
| 50 gal | 200 qt |
| 75 gal | 300 qt |
| 100 gal | 400 qt |
| 250 gal | 1,000 qt |
| 500 gal | 2,000 qt |
| 1000 gal | 4,000 qt |
Exact factor: 1 US gallon = 4 US quarts. Values rounded for display.