Industrial & Aviation Fuel Density Guide: Petrol, Diesel, Jet A-1 & LPG Mass Calculations
Learn how temperature impacts petroleum density, how to calculate fuel weight for freight and aviation, and how to convert fuel liters to kilograms accurately.
In transport logistics, commercial trucking, marine shipping, and aviation refueling, fuel is stored and metered volumetrically in liters or gallons. However, payload weight limits, gross vehicle weight ratings (GVWR), and flight trim balances are calculated strictly in mass (kilograms or pounds).
Because liquid hydrocarbons possess high thermal expansion coefficients, a tanker carrying 40,000 liters of diesel in hot summer weather (35°C) weighs significantly less than the same 40,000 liters in winter (5°C).
Key Takeaway for Logistics & Aviation: Petrol weighs ~0.74 kg/L, Diesel weighs ~0.835 kg/L, and Jet A-1 weighs ~0.804 kg/L at 15°C standard temperature. Because fuel expands when warm, 1,000 liters of diesel at 35°C weighs ~15 kg less than 1,000 liters at 15°C.
1. Petroleum Fuel Density Reference Table (ASTM D1298)
| Fuel Grade | Density @ 15°C (kg/L) | Specific Gravity | Weight of 1,000 Liters | API Gravity |
|---|---|---|---|---|
| Unleaded Gasoline (Petrol) | 0.740 kg/L | 0.740 | 740 kg | 59.7° API |
| Automotive Diesel (ULSD) | 0.835 kg/L | 0.835 | 835 kg | 37.9° API |
| Kerosene (Heating Oil) | 0.820 kg/L | 0.820 | 820 kg | 41.1° API |
| Jet A-1 Aviation Fuel | 0.804 kg/L | 0.804 | 804 kg | 44.5° API |
| Heavy Fuel Oil (Marine Bunker C) | 0.980 kg/L | 0.980 | 980 kg | 12.9° API |
| Liquid Propane (LPG) | 0.493 kg/L | 0.493 | 493 kg | N/A |
| AdBlue / DEF (32.5% Urea) | 1.090 kg/L | 1.090 | 1,090 kg | N/A |
2. Thermal Expansion: Correcting Density for Temperature
The volume of liquid hydrocarbons changes predictably with temperature. To calculate temperature-compensated density:
Density_T = Density_15 * [1 - beta * (T - 15)]
Where:
Density_15= Standard density at 15°C (kg/L)beta= Thermal expansion coefficient (approximately 0.00095 per °C for diesel)T= Measured temperature (°C)
Freight Impact Example:
A long-haul truck loads 800 liters of diesel at 35°C:
Density_35 = 0.835 * [1 - 0.00095 * (35 - 15)] = 0.819 kg/L
Actual Fuel Mass = 800 L * 0.819 kg/L = 655.2 kg
Comparing to standard 15°C conditions (800 * 0.835 = 668 kg), the thermal expansion reduces actual fuel mass by 12.8 kg.
To perform dynamic volume-to-mass calculations for automotive, aviation, and chemical liquids, visit our main Liters to Kg Fuel Calculator.
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