Which Jet A density does this converter use?

Jet A and Jet A-1 are both computed at 0.804 kg per litre (6.71 lb per US gallon), the nominal at 15C. ASTM D1655 permits any conforming batch between 0.775 and 0.840 kg per litre at that same temperature, so treat the result as a planning figure rather than a measurement of the fuel in your tanks.

Which Avgas 100LL density does this converter use?

Avgas 100LL is computed at 0.721 kg per litre (6.01 lb per US gallon) at 15C. Most POH weight and balance sections round this to 6.0 lb/gal, which understates fuel weight very slightly.

Which fuel type should I use for MSFS 2024?

Select Jet-A for airliners and business jets, and Avgas 100LL for piston GA aircraft such as the Cessna 172. The simulator uses the same density values as real-world aircraft.

Why does density matter for fuel planning?

Aircraft fuel systems measure capacity in volume (gallons or litres), but weight and balance is calculated in mass (kg or lbs). The same volume of Avgas weighs less than Jet-A, so using the wrong density gives incorrect takeoff weights.

Fuel Planning

Aviation Fuel Weight & Volume Converter

Convert aviation fuel between kg, lbs, US gallons, UK gallons, and litres. Covers Jet-A, Avgas 100LL, and Diesel with accurate ICAO density values.

CalculatorInteractive

Fuel Type

Jet-A / Jet-A1 (AVTUR) density: 0.804 kg/L nominal at 15C (ASTM D1655 permits 0.775 to 0.840)

Enter Value

gal

Input unit

Results

US Gallons (entered)1,000gal

UK Gallons832.7gal

Litres3,785.4L

Mass (kg)3,043.5kg

Mass (lbs)6,709.7lbs

How to Use & Reference

About

Aviation fuel is sold and loaded in different units depending on the country and operator. Jet-A and Jet-A1 are the standard turbine fuels used by airliners and business jets worldwide, weighing approximately 6.71 lb per US gallon (0.804 kg/L) at 15C. Avgas 100LL is the primary piston GA fuel at 6.01 lb per US gallon (0.721 kg/L). Diesel is included as a general reference at 6.94 lb per US gallon (0.832 kg/L); note that aviation diesel-cycle piston engines are themselves certified on Jet A-1 rather than automotive diesel.

How to Use

1Select the fuel type - Avgas 100LL for piston GA, Jet-A for turbine aircraft, or Diesel as a general reference.
2Enter the quantity you want to convert in the input field.
3Select the unit of your input value - kg, lbs, US gallons, UK gallons, or litres.
4All equivalent values appear instantly in the results panel below.

Tips

SimBrief and most airline OFPs show fuel in kg. FBO fuel trucks in the US are typically metered in US gallons.
Jet-A density varies slightly by temperature and batch - the 0.804 kg/L figure is the ICAO standard at 15C. Cold fuel is slightly denser.
UK gallons are larger than US gallons (4.546 L vs 3.785 L). Using the wrong gallon type causes ~20% error.
Weight and balance sheets always use mass (kg or lbs), not volume. Convert volume to mass before entering W&B.
Avgas and Jet-A have different densities - never substitute them in a calculation.

Formula

vol (L)input converted to litres

mass (kg)vol × density (kg/L)

mass (lbs)mass (kg) / 0.453592

US galvol / 3.78541

UK galvol / 4.54609

All conversions route through litres as the intermediate unit.

FAQ

Which Jet A density does this converter use?: Jet A and Jet A-1 are both computed at 0.804 kg per litre (6.71 lb per US gallon), the nominal at 15C. ASTM D1655 permits any conforming batch between 0.775 and 0.840 kg per litre at that same temperature, so treat the result as a planning figure rather than a measurement of the fuel in your tanks.
Which Avgas 100LL density does this converter use?: Avgas 100LL is computed at 0.721 kg per litre (6.01 lb per US gallon) at 15C. Most POH weight and balance sections round this to 6.0 lb/gal, which understates fuel weight very slightly.
Which fuel type should I use for MSFS 2024?: Select Jet-A for airliners and business jets, and Avgas 100LL for piston GA aircraft such as the Cessna 172. The simulator uses the same density values as real-world aircraft.
Why does density matter for fuel planning?: Aircraft fuel systems measure capacity in volume (gallons or litres), but weight and balance is calculated in mass (kg or lbs). The same volume of Avgas weighs less than Jet-A, so using the wrong density gives incorrect takeoff weights.

Densities Used by This Converter

Jet A and Jet A-1 are computed at 0.804 kg/L (6.71 lb per US gallon), Avgas 100LL at 0.721 kg/L (6.01 lb per US gallon), both at 15C. Those are nominals, not constants: real fuel varies with the specification band, temperature, and - for UK/imperial gallons, which are about 20% larger than US gallons - which gallon a source actually means.

Aviation Fuel Weight Reference Table

Fuel type	lb per US gal	kg per litre	lb per litre	kg per US gal
Jet A / Jet A-1	6.71	0.804	1.77	3.04
Avgas 100LL	6.01	0.721	1.59	2.73
Diesel	6.94	0.832	1.83	3.15

Densities at 15C per ICAO standard atmosphere. Quick examples: 100 US gallons of Jet A weighs about 671 lb (304 kg); 50 gallons of 100LL weighs about 300 lb (136 kg); 1,000 litres of Jet A weighs 804 kg (1,772 lb).

Why Fuel Weight Matters

Fuel is bought and loaded by volume but flight planning runs on mass. Takeoff performance, range, and centre of gravity all depend on fuel weight, so converting volume to mass with the right density is the first step of every load sheet. Once you have the weight, plan your trip fuel with the fuel calculator and check your loading with the weight and balance calculator.