How to Convert US gallons to US cups (gal to cup)
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 gallons into us cups by hand, with examples and a quick-reference table.
The conversion
To convert us gallons to us cups, multiply the value by 16.0000084535. To go the other way, divide by the same number (or multiply by 0.062499967). For a quick estimate, multiply by about 16.
US cups = us gallons × 16.0000084535
Worked examples
- 3 gal = 48 cup
- 12.5 gal = 200.0001 cup
- 75 gal = 1,200 cup
US gallons to US cups table
| US gallons | US cups |
|---|---|
| 1 gal | 16 cup |
| 2 gal | 32 cup |
| 5 gal | 80 cup |
| 10 gal | 160.0001 cup |
| 20 gal | 320.0002 cup |
| 25 gal | 400.0002 cup |
| 50 gal | 800.0004 cup |
| 100 gal | 1,600 cup |
| 250 gal | 4,000 cup |
| 500 gal | 8,000 cup |
| 1,000 gal | 16,000.01 cup |
Common questions
Is gal to cup 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 cups to US gallons converter.
Mistakes to avoid
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
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.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Background
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.
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.
For any value, use the US gallons to US cups Converter or browse all volume converters.
Run your own numbers: US gallons to US cups Converter