How to Convert Liters to US Gallons
There are two gallons. The US liquid gallon = 3.785411784 liters — defined as exactly 231 cubic inches. The imperial (UK) gallon = 4.54609 liters — defined as the volume of 10 pounds of water at 62°F. Same word, 20% difference. This calculator uses the US gallon because that's what American gas stations, American recipes, and American aquarium specs use. If you're reading a British cookbook or a Canadian fuel economy figure from before 1977, confirm which gallon you're dealing with. The conversion formula is US gallons = liters × 0.264172052 — the mathematical reciprocal of 3.785411784. For imperial gallons, use liters × 0.219969 instead.
The Conversion Formula
US gallons = liters × 0.264172052
Worked Examples
Example 1: Convert 50 liters to US gallons
50 × 0.26417 = 13.21 gal (typical compact car fuel tank — a Toyota Corolla holds about 50 L / 13.2 gal)
Example 2: Convert 3.78541 liters to US gallons
3.78541 × 0.26417 = 1.000 gal (the definitional equivalence — exactly one US gallon)
Example 3: Convert 1,000 liters to US gallons
1,000 × 0.26417 = 264.2 gal (a standard IBC tote tank — common in chemical and food processing)
Common Liters To US Gallons Conversions
| liters | US gallons |
|---|---|
| 1 L | 0.2642 gal |
| 5 L | 1.321 gal |
| 10 L | 2.642 gal |
| 20 L | 5.283 gal |
| 50 L | 13.21 gal |
| 100 L | 26.42 gal |
Related Unit Converters
Frequently Asked Questions
How many liters are in a US gallon vs an imperial gallon?
1 US liquid gallon = 3.785411784 liters. 1 imperial (UK) gallon = 4.54609 liters. The imperial gallon is 20% larger. If you're reading a British cookbook, a Canadian fuel economy label from before 1977, or any Caribbean island that was a British colony, confirm which gallon is being used. Using the wrong one produces a 20% volume error — enough to run out of gas or ruin a batch recipe.
How do I compare European fuel economy (L/100km) to US MPG?
Divide 235.215 by L/100km to get US MPG. Example: 5.0 L/100km → 235.215 ÷ 5.0 = 47.0 MPG (US). For UK MPG use 282.481 instead. Quick reference: 4 L/100km = 58.8 MPG, 6 L/100km = 39.2 MPG, 8 L/100km = 29.4 MPG. The constant 235.215 = (100 km × 0.621371 mi/km × 3.78541 L/gal) — it bakes in both the distance and volume conversions.
Has a liters-to-gallons mistake ever caused a real accident?
The Gimli Glider — Air Canada Flight 143, July 23, 1983 — is the canonical example. Canada had just adopted the metric system, and the ground crew used the wrong conversion factor when calculating the fuel load for a Boeing 767. The plane needed 22,300 kg of fuel but was loaded with 22,300 lbs — less than half the required amount. Both engines flamed out at 41,000 feet. The crew glided the aircraft to an emergency landing on a decommissioned runway in Gimli, Manitoba. Zero fatalities. The investigation cited the liters/kilograms/pounds/gallons unit confusion as the primary cause.
What's the quickest way to estimate liters to US gallons?
Divide by 4 and add 5%. 60 L ÷ 4 = 15, + 5% (0.75) = 15.75 gal. Actual: 15.85 gal — error of about 1%. For imperial gallons: divide by 4.5. 60 L ÷ 4.5 ≈ 13.3 imperial gallons. Common references: 2 L soda = 0.53 US gal (roughly half a gallon jug), 50 L fuel tank = 13.2 gal, 200 L drum = 52.8 gal.
Engineering Context
The US vs imperial gallon distinction is not academic — it's a 20% volume error that propagates through fuel systems, chemical batch processing, and international trade. The US gallon (231 cubic inches, exactly 3.785411784 L) descends from the English wine gallon of 1707, while the imperial gallon (exactly 4.54609 L) was standardized in 1824 as the volume of 10 pounds of distilled water at 62°F. Both are still in active use: the US gallon for fuel and beverages in the US and its territories, the imperial gallon for fuel in the UK, Canada (pre-1977), and many Commonwealth Caribbean nations. When a US company acquires a UK chemical plant, every tank, pipe schedule, and pump curve must be re-labeled — because a 10,000 US gallon reactor holds only 8,327 imperial gallons, and a process designed for 10,000 imperial gallons won't fit. The fix: when in doubt, specify volumes in liters. Liters are unambiguous. Gallons are not.
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