Enter the torque and displacement of an engine into the calculator to determine the brake mean effective pressure (BMEP).

## BMEP Formula

The following formula is used to calculate a brake mean effective pressure.

BMEP = 150.8 * T / D
• Where BMEP is the brake mean effective pressure (psi)
• T is the torque (lb-ft)
• D is the displacement (CID – cubic inch displacement)

To calculate the break mean effective pressure, divide the torque by the displacement, then multiply the result by 150.8.

## BMEP Definition

BMEP is an acronym that stands for brake mean effective pressure. The brake mean effective pressure is a measure of the total pressure that if applied to the pistons of an engine through an entire stroke, would reduce the power output of the engine.

## Example Problem

How to calculate BMEP?

1. First, determine the total torque the motor can output.

For this example, the motor being analyzed can output a total of 55 pound-feet (lb-ft) of torque.

2. Next, determine the displacement of the engine.

In this case, the engine displacement is measured to be 10 cubic inches (10 in^3)

3. Finally, calculate the brake mean effective pressure.

Using the formula above, the BMEP is found to be:
BMEP = 150.8 * T / D
BMEP = 150.8 * 55 / 10
BMEP = 829.4