Aviation Fuel Weight Converter – Avgas & Jet A-1
This aviation fuel weight converter changes fuel between litres, US gallons, imperial gallons, kilograms and pounds for Avgas 100LL, Jet A-1 or a custom density.
Densities are typical values at 15°C. Fuel density changes with temperature and batch; use the density on the fuel receipt or your operator’s figure where required.
For training and general informational use. Use approved aircraft and operator data for fuel and loading.
Convert aviation fuel volume to weight
Fuel is bought by volume but matters by weight. Weight and balance, maximum takeoff weight and performance all need kilograms or pounds, while the pump and the fuel gauge show litres or gallons. This converter handles both directions for the common aviation fuels and lets you enter a measured density when accuracy matters.
How to use it
- Enter the fuel quantity and choose its unit.
- Choose the fuel type, or Custom to enter a density in kg per litre.
- Convert to see the same fuel in litres, US gallons, imperial gallons, kilograms and pounds.
Method and calculation
Everything is converted to litres first: 1 US gallon = 3.785 L and 1 imperial gallon = 4.546 L. Mass in kg = litres × density, and pounds = kg × 2.2046. Typical densities: Avgas 100LL about 0.72 kg/L (6.0 lb per US gallon) and Jet A-1 about 0.80 kg/L (6.7 lb per US gallon).
Worked example and practical notes
40 US gallons of Avgas 100LL is 151.4 litres, which weighs about 109 kg (240 lb). The same volume of Jet A-1 weighs about 121 kg (267 lb), which is why using the wrong density in weight and balance can matter.
Accuracy and practical tips
Warm fuel is less dense, so a full tank on a hot day weighs slightly less than on a cold one. Never mix up kilograms and pounds when ordering fuel or completing a load sheet; confirm units with the fueller.
Typical densities from published fuel specifications (ASTM D910 for Avgas, ASTM D1655 and Def Stan 91-091 for Jet A/Jet A-1). Actual density varies by batch and temperature.
Last reviewed: October 2026
Read the guide: Aviation Fuel Weight: Avgas and Jet A-1 Conversions
Frequently asked questions
How much does a gallon of Avgas weigh?
About 6 lb (2.72 kg) per US gallon at 15°C, which is the figure most light-aircraft weight and balance uses.
How much does a litre of Jet A-1 weigh?
About 0.80 kg per litre at 15°C. The specification allows roughly 0.775 to 0.840 kg/L.
Why does fuel density change?
Fuel expands as it warms, so the same mass takes up more volume and each litre weighs a little less.
Can I use this for weight and balance?
Yes, as a conversion step. Then enter the fuel weight and its arm in the Weight and Balance Calculator.