How to Convert US gallons to US quarts (gal to qt)
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 quarts by hand, with examples and a quick-reference table.
The conversion
To convert us gallons to us quarts, multiply the value by 3.9999978866. To go the other way, divide by the same number (or multiply by 0.2500001321). For a quick estimate, multiply by about 4.
US quarts = us gallons × 3.9999978866
Worked examples
- 3 gal = 12 qt
- 12.5 gal = 50 qt
- 75 gal = 299.9998 qt
US gallons to US quarts table
| US gallons | US quarts |
|---|---|
| 1 gal | 4 qt |
| 2 gal | 8 qt |
| 5 gal | 20 qt |
| 10 gal | 40 qt |
| 20 gal | 80 qt |
| 25 gal | 99.9999 qt |
| 50 gal | 199.9999 qt |
| 100 gal | 399.9998 qt |
| 250 gal | 999.9995 qt |
| 500 gal | 2,000 qt |
| 1,000 gal | 4,000 qt |
Common questions
Is gal to qt 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 quarts to US gallons converter.
Mistakes to avoid
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
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.
Background
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
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 everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
For any value, use the US gallons to US quarts Converter or browse all volume converters.
Run your own numbers: US gallons to US quarts Converter