Gallons ↔ Liters Converter
Convert between US gallons, Imperial gallons, and liters for fuel planning. Note: US gallons and Imperial gallons are NOT the same — 1 Imperial gallon is about 20% larger than 1 US gallon.
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Formula
1 US gal = 3.78541 L 1 Imp gal = 4.54609 L 1 US gal = 0.8327 Imp gal
US gallons are used in American aviation. Imperial gallons are used in some Commonwealth countries. Always verify which gallon type is referenced in your POH.
Reference Table
| US Gal | Imp Gal | Liters | Context |
|---|---|---|---|
| 10 | 8.3 | 37.9 | Small reserve quantity |
| 40 | 33.3 | 151.4 | Typical C172 usable fuel |
| 56 | 46.6 | 212.0 | C172SP total fuel capacity |
| 84 | 69.9 | 318.0 | C182 total fuel capacity |
| 100 | 83.3 | 378.5 | Round reference number |
Aviation Context
100LL avgas weighs 6.0 lbs per US gallon. Jet-A weighs 6.7 lbs per US gallon. Confusing US and Imperial gallons when fueling can lead to dangerous fuel shortages. The Gimli Glider incident (1983) was caused in part by a metric/imperial fuel calculation error.
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