Formula
BSFC=fuel kg/h × 1000 / brake kW.
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Use measured brake output at the same operating point as fuel flow. No engine map or heating-value assumptions.
Example Calculation
Example inputs
- Fuel mass flow: 10 kg/h
- Brake power: 50 kW
10 kg/h divided by 50 kW gives 200 g/kWh.
Frequently asked questions
How do I use this calculator?
Enter fuel mass flow, brake power. The result updates automatically. Use Reset to restore the example values.
What method does it use?
BSFC=fuel kg/h × 1000 / brake kW.. Use measured brake output at the same operating point as fuel flow. No engine map or heating-value assumptions.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.