Gallons to Liters Converter
Convert gallons to liters and back. 1 gallon = 3.785411784 liters exactly.
Tip: Results show up to 8 significant digits. The factors and their sources are listed on the "Where our numbers come from" page.
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Gallons and Liters
One gallon is exactly 3.785411784 liters, and one liter is about 0.264172052358 gallons. The converter works both ways: use the two tabs at the top of the tool to choose the direction.
Quick conversion table
Gallons to Liters
| Gallons | Liters |
|---|---|
| 0.25 gal | 0.94635295 L |
| 0.5 gal | 1.8927059 L |
| 1 gal | 3.7854118 L |
| 2 gal | 7.5708236 L |
| 5 gal | 18.927059 L |
| 10 gal | 37.854118 L |
| 15 gal | 56.781177 L |
| 20 gal | 75.708236 L |
| 25 gal | 94.635295 L |
| 50 gal | 189.27059 L |
| 100 gal | 378.54118 L |
| 500 gal | 1,892.7059 L |
Liters to Gallons
| Liters | Gallons |
|---|---|
| 1 L | 0.26417205 gal |
| 2 L | 0.5283441 gal |
| 5 L | 1.3208603 gal |
| 10 L | 2.6417205 gal |
| 20 L | 5.283441 gal |
| 40 L | 10.566882 gal |
| 50 L | 13.208603 gal |
| 60 L | 15.850323 gal |
| 100 L | 26.417205 gal |
| 500 L | 132.08603 gal |
Exact factor and source
| Conversion | Value | Basis |
|---|---|---|
| 1 gallon in liters | 3.785411784 | exact. NIST SP 811 (2008), Appendix B.8: 1 gal (US) = 231 in3 = 3.785411784 L exactly |
| 1 liter in gallons | 0.264172052358 | rounded to 12 digits. SI Brochure, 9th edition (BIPM 2019): the liter is accepted for use with the SI; 1 L = 1 dm3 |
How to convert gallons to liters
- Step oneTake the number of gallons.
- Step twoMultiply it by 3.785411784.
- Step threeThe result is the number of liters.
- Step fourTo go back, divide by 3.785411784, or multiply by 0.264172052358.
Example: 15 gal x 3.785411784 = 56.78117676 L.
All volume units compared
Each unit written in milliliters, the base unit of this tool. Exact values come straight from the definitions.
| Unit | Symbol | Value in milliliters |
|---|---|---|
| Milliliters | mL | 1 milliliter |
| Liters | L | 1,000 milliliters |
| Fluid ounces | fl oz | 29.5735295625 milliliters |
| Cups | cup | 236.5882365 milliliters |
| Pints | pt | 473.176473 milliliters |
| Quarts | qt | 946.352946 milliliters |
| Gallons | gal | 3,785.411784 milliliters |
What is a gallon?
The US gallon is exactly 3.785411784 liters and holds 4 quarts or 16 cups. US fuel is sold by the gallon. The UK imperial gallon (4.54609 liters) is a different, larger unit.
What is a liter?
The liter (L) is one cubic decimeter, 1,000 milliliters, or 0.264172052358 US gallons. Drinks, fuel and water are measured in liters in most countries.
What this converter does not do
- Results are rounded for display to 8 significant digits; the stored factor is the exact one.
- It converts US liquid measures (gallon, quart, pint, cup, fluid ounce). UK imperial units of the same names are larger and are not used here.
- It does not convert between a volume and a weight, because that needs the density of the ingredient.
Frequently asked questions
How many liters are in a gallon?
1 gallon is exactly 3.785411784 liters. That factor is exact by definition.
How many gallons are in a liter?
1 liter is about 0.264172052358 gallons.
How many liters does a 15 gallon fuel tank hold?
A 15 gallon tank holds 56.781177 liters (US gallons).
Where do the factors come from?
Gallons: NIST SP 811 (2008), Appendix B.8: 1 gal (US) = 231 in3 = 3.785411784 L exactly. Liters: SI Brochure, 9th edition (BIPM 2019): the liter is accepted for use with the SI; 1 L = 1 dm3.
References
- Gallons: NIST SP 811 (2008), Appendix B.8: 1 gal (US) = 231 in3 = 3.785411784 L exactly
- Liters: SI Brochure, 9th edition (BIPM 2019): the liter is accepted for use with the SI; 1 L = 1 dm3
- NIST Special Publication 811: Guide for the Use of the International System of Units (SI), 2008 edition.
- The International System of Units (SI Brochure), 9th edition, BIPM.