Brake Specific Fuel Consumption (BSFC) Calculator

BSFC Calculator: Brake Specific Fuel Consumption

Brake specific fuel consumption is the standard way engineers compare fuel efficiency across engines of different sizes: it measures fuel burned per unit of useful power delivered, rather than per unit time. Lower BSFC means better efficiency.

The Formula

BSFC = (Fuel Consumption(kg/hr) × 1000) / Power(kW)

Worked Example

An engine consumes 20 kg/hr of fuel while producing 80 kW of power.

BSFC = (20 × 1000) / 80 = 250 g/kWh

How to Use This Calculator

1. Enter the fuel consumption rate in kg/hr.
2. Enter the power output in kW.
3. Click Calculate to get the BSFC in g/kWh.

Related Calculations

Compare against the Indicated Thermal Efficiency Calculator for a complementary efficiency view.