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Aviation Fuel Conversion Calculator

Convert between liters, pounds, lbs, kilograms, kg, US gallons, and Imperial gallons for aviation fuels. Supports Jet A1, Jet B, and Avgas 100LL with industry-standard densities. Used by aircraft maintenance engineers and pilots for weight & balance, fuel planning, and refueling.


Fuel Conversion Tool

Select Fuel Type


Standard Aviation Fuel Densities (at 15°C / 59°F)

Fuel Type lbs/US gal kg/L kg/US gal
Jet A1 6.71 0.804 3.044
Jet B 6.52 0.780 2.957
Avgas 100LL 6.02 0.720 2.721

Source: ASTM D1655 (Jet A), ASTM D910 (Avgas), ICAO Doc 9976.

Fuel Conversion FAQ

In aviation, energy content is directly related to mass, not volume. While 1,000 liters of fuel will expand on a hot day and shrink on a cold day, 1,000 kg of fuel will always provide the same amount of energy and exert the same weight on the aircraft structure, regardless of temperature.

This tool uses standard ISA density values at 15°C:
  • Jet A-1: ~0.804 kg/L (6.7 lbs/USG)
  • AVGAS 100LL: ~0.721 kg/L (6.0 lbs/USG)
Note: Actual SG varies by batch and temperature. Always check the fuel release note during refueling for precise Uplift calculations.

A US Gallon is smaller (3.785 Liters) than an Imperial Gallon (4.546 Liters).

Warning: Mixing these units during manual fuel planning is a common cause of fuel exhaustion incidents. Always verify the unit used by the fuel truck meter.

To calculate the required uplift in Liters:
  1. Determine the required Block Fuel (Total weight needed).
  2. Subtract the Fuel on Board (Current weight in tanks).
  3. Divide the resulting weight by the Fuel Density (SG).
Example: You need 500kg more fuel and the SG is 0.80.
500 / 0.80 = 625 Liters of uplift required.