Fuel & Liquid Weight Calculator
Convert volume (Litres, Gallons) to weight (kg, lbs) for Avgas, Jet A-1, Diesel, Petrol, and Water.
Last reviewed by the myCalculator Editorial Team
Input Parameters
Calculation Results
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Formula & How Fuel & Liquid Weight Calculator Works
Aircraft weight and balance needs fuel in kilograms or pounds, but fuel is sold by volume, so you multiply litres by the fuel's density. Avgas 100LL is about 0.72 kg/L, so 100 L weighs 72 kg, or 158.7 lb. Jet A-1 is denser at about 0.80 kg/L, so 100 L weighs about 80 kg. Water is 1.0 kg/L and diesel is about 0.84 kg/L. Fuel density changes with temperature, so use the figure from your flight manual or the fuel supplier for a precise calculation. Enter the volume and the fuel type to get the mass in kg and lb, then use it in your weight and balance sheet.
- Enter Fluid / Fuel Type: Input your target parameter value.
- Enter Fuel Quantity / Amount: Input your target parameter value.
- Enter Input Unit: Input your target parameter value.
- Apply Formula: Calculate using
Weight (kg) = Volume (L) × Density (kg/L) | Weight (lbs) = Weight (kg) × 2.20462. - Review Results: View exact computed answers, metrics, and worked mathematical proofs.
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Frequently Asked Questions (FAQs)
How much does 100 Litres of Avgas weigh?
100 Litres of Avgas 100LL weighs 72.0 kg (approx. 158.7 lbs).
How much does a US Gallon of Jet A-1 weigh?
1 US Gallon of Jet A-1 weighs approximately 6.7 lbs (3.04 kg).
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Authoritative Standards & Verified Reference Citations
Calculations and mathematical logic on this page are grounded in published statutory rules, regulatory standards, and official government data published by the following bodies:
Statutory fuel price monitoring and 24-hour price transparency service for Western Australia.
Real-time statutory fuel price matching across all service stations in New South Wales.
Statutory fuel price reporting scheme providing mandatory real-time retail bowser price transparency across South Australia.
Mandatory statutory reporting scheme requiring all Queensland fuel retailers to report price changes within 30 minutes.
Statutory fuel price transparency scheme for service stations across Darwin, Alice Springs, and regional Northern Territory.
Official Australian fuel consumption ratings (L/100km) and tailpipe CO₂ emissions data.
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