Convert US Gallon to Liter
Convert us gallons to liters instantly. 1 us gallon = 3.785411784 liter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Liter to US Gallon converter for the reverse conversion.
Units explained
US Gallon
The US liquid gallon is defined as exactly 231 cubic inches (3.785411784 liters).
Based on the English wine gallon of 231 cubic inches, retained by the US after 1824.
The primary US unit for fuel, milk and large beverage containers.
English wine gallon; US since 1824.
Liter
The liter is a metric unit of volume equal to one cubic decimeter (0.001 m³). It is the everyday metric volume unit.
Introduced in France in 1795; redefined in 1964 as exactly one cubic decimeter.
The world's common unit for beverages, fuel, and household liquids.
France, 1795; CGPM 1964.
US Gallon to Liter conversion formula
The relationship between us gallons and liters:
To convert us gallons to liters, multiply the value in us gallons by 3.785411784. To reverse, multiply liters by 0.2641720524.
How to use this converter
Type a value into the calculator. The result in liters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Liter to US Gallon converter for the reverse direction.
Step-by-step: convert us gallons to liters
- Write down the value in us gallons (gal).
- Multiply that value by the factor 3.785411784.
- The product is the equivalent value in liters (L).
- To reverse, multiply the liter value by 0.2641720524.
Worked examples
Example 1 — Convert 1 gal to L:
1 × 3.785411784 = 3.785411784 L
Example 2 — Convert 100 gal to L:
100 × 3.785411784 = 378.5411784 L
Real-world example — Ruler-scale measurements
A 30-us gallon school ruler converts cleanly to liters — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 gal × 3.785411784 = 113.56235352 L
Real-world example — Hardware-scale dimensions
A 10-us gallon fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between us gallons and liters daily when mixing metric and imperial tools.
10 gal × 3.785411784 = 37.85411784 L
Real-world example — Postcard and small-object dimensions
A postcard is about 5 us gallons wide. Converting to liters is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 gal × 3.785411784 = 18.92705892 L
US Gallon to Liter conversion table
Standard reference values for converting us gallons to liters:
| US Gallon [gal] | Liter [L] |
|---|---|
| 0.01 | 0.0378541178 |
| 0.1 | 0.3785411784 |
| 1 | 3.785411784 |
| 2 | 7.570823568 |
| 3 | 11.356235352 |
| 4 | 15.141647136 |
| 5 | 18.92705892 |
| 10 | 37.85411784 |
| 20 | 75.70823568 |
| 30 | 113.56235352 |
| 40 | 151.41647136 |
| 50 | 189.2705892 |
| 100 | 378.5411784 |
| 500 | 1892.705892 |
| 1000 | 3785.411784 |
Frequently asked questions
How many liters is 1 us gallon?
How do I convert us gallons to liters?
How do I convert liters back to us gallons?
How many liters is 100 us gallons?
Popular volume unit conversions
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Metric / SI (15 units)
US Customary (Liquid) (14 units)
US Customary (Dry) (5 units)
Imperial (UK) (14 units)
Cubic (length-derived) (4 units)
Cooking / Culinary (5 units)
Sources & references
Conversion factor (1 gal = 3.785411784 L) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.