How to Convert US gallons to Litres (gal to L)
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 litres by hand, with examples and a quick-reference table.
The conversion
To convert us gallons to litres, multiply the value by 3.78541. To go the other way, divide by the same number (or multiply by 0.2641721769). For a quick estimate, multiply by about 3.8.
Litres = us gallons × 3.78541
Worked examples
- 3 gal = 11.3562 L
- 12.5 gal = 47.3176 L
- 75 gal = 283.9058 L
US gallons to Litres table
| US gallons | Litres |
|---|---|
| 1 gal | 3.7854 L |
| 2 gal | 7.5708 L |
| 5 gal | 18.9271 L |
| 10 gal | 37.8541 L |
| 20 gal | 75.7082 L |
| 25 gal | 94.6352 L |
| 50 gal | 189.2705 L |
| 100 gal | 378.541 L |
| 250 gal | 946.3525 L |
| 500 gal | 1,892.71 L |
| 1,000 gal | 3,785.41 L |
Common questions
Is gal to L 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 Litres to US gallons converter.
Mistakes to avoid
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.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
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.
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.
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.
For any value, use the US gallons to Litres Converter or browse all volume converters.
Run your own numbers: US gallons to Litres Converter