How to Convert US cups to US gallons (cup to gal)
Volume conversions help with baking from American recipes, comparing petrol prices quoted per gallon abroad with pump prices per litre here, and reading PUB water bills in cubic metres. This guide shows how to convert us cups into us gallons by hand, with examples and a quick-reference table.
The conversion
To convert us cups to us gallons, multiply the value by 0.062499967. To go the other way, divide by the same number (or multiply by 16.0000084535). For a quick estimate, multiply by about 0.062.
US gallons = us cups × 0.062499967
Worked examples
- 3 cup = 0.1875 gal
- 12.5 cup = 0.78125 gal
- 75 cup = 4.6875 gal
US cups to US gallons table
| US cups | US gallons |
|---|---|
| 1 cup | 0.0625 gal |
| 2 cup | 0.125 gal |
| 5 cup | 0.3125 gal |
| 10 cup | 0.625 gal |
| 20 cup | 1.25 gal |
| 25 cup | 1.5625 gal |
| 50 cup | 3.125 gal |
| 100 cup | 6.25 gal |
| 250 cup | 15.625 gal |
| 500 cup | 31.25 gal |
| 1,000 cup | 62.5 gal |
Common questions
Is cup to gal exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the US gallons to US cups converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Background
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
For any value, use the US cups to US gallons Converter or browse all volume converters.
Run your own numbers: US cups to US gallons Converter