Gallons to Liters Converter
Unit ConversionConvert gallons to liters: 1 gallon equals exactly 3.785411784 liters. With a conversion table, the formula and every related volume converter.
Liters
Equivalent volume in liters
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SponsoredThis calculator converts a volume in US gallons to liters using the exact factor: multiply the gallon value by 3.785411784. The US gallon has a fixed legal size, so this factor carries no rounding at all; the section below gives the exact figure.
Gallons to liters is a common conversion for fuel tank capacity, bulk liquid purchases, and comparing a US gallon price against a per-liter price used almost everywhere else in the world. This page covers the US gallon specifically, not the larger UK imperial gallon.
For the reverse direction, converting liters back into gallons, or converting a gallon value into quarts instead, see the related converters below.
Gallons to Liters Conversion Table
This table covers common fuel-tank and bulk-liquid measurements.
| Gallons | Liters |
|---|---|
| 1 gal | 3.785 L |
| 2 gal | 7.571 L |
| 5 gal | 18.927 L |
| 10 gal | 37.854 L |
| 15 gal | 56.781 L |
| 20 gal | 75.708 L |
| 25 gal | 94.635 L |
| 50 gal | 189.271 L |
| 55 gal | 208.198 L |
The Gallons to Liters Formula
To convert gallons to liters, multiply the gallon value by 3.785411784. For example, 15 gallons times 3.785411784 equals approximately 56.78 liters.
To go the other way, use the Liters to Gallons converter instead, which divides by the same factor for you. For the mid-size quart scale instead, see the Gallons to Quarts converter below.
How Many Liters in a Gallon
The US gallon is legally defined as exactly 231 cubic inches, a figure that converts to exactly 3,785.411784 mL once cubic inches are expressed in metric terms. This is why the factor has so many decimal places, rather than being a cleanly rounded number.
A UK imperial gallon is exactly 4.54609 liters, so the same word means about 20% more liquid in a British recipe or fuel figure.
A Common Reference Point: Fuel Tanks
A typical car fuel tank holding 15 US gallons holds about 56.8 liters, a useful mental benchmark when comparing a US-spec vehicle's tank size against a liter-based figure from elsewhere.
To find what a volume weighs, the Gallons to Pounds Converter converts gallons to pounds for water, milk, flour, sugar, honey, or butter. The Liters to Pounds Converter does the same starting from liters. Paint is sold by the gallon, and the Paint Coverage Calculator works out how many gallons a wall area needs for a given number of coats.
Frequently Asked Questions
How many liters is 3 gallons?
11.356235352 liters.
How many liters is 4 gallons?
15.141647136 liters.
How many liters is 7 gallons?
26.497882488 liters.
How many liters is 12 gallons?
45.424941408 liters.
How many gallons is 1 liter?
1 liter equals approximately 0.264172 US gallon, the reverse of this conversion.
Can a gallons-to-liters result be negative?
No. A volume can't be below zero, so a negative entry shows a dash instead of a result. A minus sign in front of a value is usually a typing slip.
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