Gallons to litres●
Gallons in. Litres out. Convert fuel and water in a moment.
Volume
Use a decimal point, for example 2.54. Scientific notation works too: 1e3.
Try a value
Pick an example to startThe formula
litres = us gallons (liquid) × 3.785411784
Multiply the number of us gallons (liquid) by 3.785411784 to get litres. To go the other way, divide by the same number.
A worked example
For 10 US gal, multiply 10 by 3.785411784. The result is approximately 37.854118 L.
10 × 3.785411784 ≈ 37.854118 L
Quick reference
Reference values are rounded to 6 decimal places. Use the converter above for other values or precision.
| US gallons (liquid) (US gal) | Litres (L) |
|---|---|
| 0.25 | 0.946353 |
| 0.5 | 1.892706 |
| 1 | 3.785412 |
| 2 | 7.570824 |
| 5 | 18.927059 |
| 10 | 37.854118 |
| 15 | 56.781177 |
| 20 | 75.708236 |
| 50 | 189.270589 |
All equivalent units
The same value, in every supported unit.
Volume conversions
For US fuel and water volumes.
Use this conversion for US fuel prices, tank sizes and water use. Multiply gallons by 3.785411784 to get litres. For quick checks, one gallon is a little under four litres.
Calculation details & precision
Volume conversions use litres as the base unit. One litre is 1,000 mL or 0.001 m³. A US liquid gallon is exactly 3.785411784 L; a UK Imperial gallon is exactly 4.54609 L. The US customary cup is 1/16 of a US liquid gallon; the metric cup here is 250 mL.
Automatic displays up to 12 significant digits. Choose 2, 4 or 6 decimal places in Precision for a shorter result. Displayed results are rounded; very large or small values use scientific notation.
Common questions
How many litres is a gallon of petrol?
A US gallon is 3.785 litres. A UK gallon is 4.546 litres. Check which one your source uses.
How many litres are in 5 us gallons (liquid)?
5 US gal is approximately 18.927059 L. The converter can show more significant digits or round to a chosen number of decimal places.