This converter turns US cups into US gallons instantly, using the exact factor 1 US cup = 0.0625 US 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.
The US legal cup used in recipes: 240 mL, or 236.6 mL by the customary definition. Exactly 231 cubic inches — the US liquid gallon used for fuel and milk.
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 cups- The amount you are converting, measured in US cups
0.0625- The exact number of US gallons in one US cup
US gallons- The converted result
How it works, step by step
- Enter the number of US cups you want to convert.
- The value is multiplied by 0.0625, the exact conversion factor.
- The result is displayed in US gallons, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 US cups
Multiply 5 by 0.0625. That gives 0.3125 US gallons. A quick sanity check: one US cup is smaller than one US gallon, so the number should get smaller — and it does.
Converting 72 US cups
72 × 0.0625 = 4.5 US gallons. Working backwards, 4.5 ÷ 0.0625 returns 72 US cups, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many US gallons are in one US cup?
Exactly 0.0625. 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 cups to US gallons?
Us Gallons = US cups × 0.0625. To reverse it, divide instead: US cups = US gallons ÷ 0.0625, which is the same as multiplying by 16.
Is the US cup bigger than the US gallon?
No. One US cup is only 0.0625 of a US gallon, so the US gallon is the larger unit.
Why does my answer differ slightly from other cups to us-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 cup?
The US legal cup used in recipes: 240 mL, or 236.6 mL by the customary definition.
What is a US gallon?
Exactly 231 cubic inches — the US liquid gallon used for fuel and milk.
Us Cups to US gallons reference table
| Us Cups | Us Gallons |
|---|---|
| 0.5 cup | 0.03125 gal |
| 1 cup | 0.0625 gal |
| 2 cup | 0.125 gal |
| 3 cup | 0.1875 gal |
| 5 cup | 0.3125 gal |
| 10 cup | 0.625 gal |
| 15 cup | 0.9375 gal |
| 20 cup | 1.25 gal |
| 25 cup | 1.5625 gal |
| 50 cup | 3.125 gal |
| 75 cup | 4.6875 gal |
| 100 cup | 6.25 gal |
| 250 cup | 15.625 gal |
| 500 cup | 31.25 gal |
| 1000 cup | 62.5 gal |
Exact factor: 1 US cup = 0.0625 US gallons. Values rounded for display.