// multi-utility computation suite · offline · instant · precise
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eng.engine-specific-fuel-consumption Calculator
Calculates engine Specific Fuel Consumption (SFC or BSFC) from fuel flow rate and power output, and compares to typical engine values. BSFC in g/kWh is the primary engine efficiency metric — modern diesel engines achieve 190–210 g/kWh; Otto cycle engines 250–300 g/kWh.
Inputs
Thrust Kn
Reference formula or conversion factor shown for context.
Fuel Flow Kg S
Volume of fluid per unit time. Used to size pipes, pumps, and ducts.
Flight Speed M S
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Results
SFC (mg/N·s)
Sample size or count used in the calculation.
SFC (kg/kN·hr)
Sample size or count used in the calculation.
propulsive efficiency η_p
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
range factor (Breguet parameter)
A dimensionless multiplier applied in the calculation.
SFC = ṁ_fuel / F
Reference formula or conversion factor shown for context.