Enter the fuel consumption rate (grams per second) and the power produce by the engine (watts) into the calculator to determine the BSFC.

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## BSFC Formula

The following formula is used to calculate brake-specific fuel consumption.

BSFC = r / P

- Where BSFC is the brake-specific fuel consuption ( g/J)
- r is the standard rate of fuel consumption (grams per second, g/s)
- P is the power output by the engine (watts, W)

To calculate brake specific fuel consumption (BSFC), divide the standard rate of fuel consumption by the power output of the engine.

## BSFC Definition

**What is BSFC? **

BSFC, which is short for break-specific fuel consumption, is a measure of the fuel efficiency of any engine that burns fuel in order to produce a rotational movement and power.

## Example Problem

How to calculate BSFC?

**First, determine the rate of fuel consumption of the engine.**In this example, the engine consumes a total of 2.75 grams of fuel per second.

**Next, determine the power output of the engine.**This engine is able to output 40 watts of energy.

**Finally, calculate the BSFC.**Using the formula, the break-specific fuel consumption is found to be:

BSFC = r / P

BSFC = 2.75/40

BSFC = r / P

BSFC = .06875 g/J