Free Thrust Specific Fuel Consumption Calculator
Determine thrust specific fuel consumption (TSFC) of a jet engine from fuel flow rate and thrust produced.
TSFC
25.000 kg/(kN·h)
TSFC vs Fuel Flow Rate
Thrust Specific Fuel Consumption
TSFC measures how efficiently a jet engine converts fuel into thrust. Lower values indicate better fuel economy.
Formula
TSFC = fuel_flow / Thrust
where fuel_flow is in kg/h and thrust in kN for the common industry unit of kg/(kN·h). Modern high-bypass turbofans achieve TSFC values around 15-20 g/(kN·s). Turbojet engines are less efficient at about 25-30 g/(kN·s).
Example Calculation
A turbofan engine producing 100 kN of thrust while burning 2500 kg/h of fuel.
- 01TSFC = 2500 kg/h ÷ 100 kN = 25 kg/(kN·h)
- 02Convert to SI: 25 / 3.6 = 6.944 g/(kN·s)
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