BMEP Calculator - Brake Mean Effective Pressure

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Forward mode: enter torque and displacement to get BMEP. Reverse mode: enter a target BMEP and displacement to get required torque. Power mode: add engine speed to get shaft power.
A 4-stroke engine fires once every two crankshaft revolutions (n = 2); a 2-stroke engine fires every revolution (n = 1).
Peak torque output at the crankshaft (before transmission losses).
N·m
Total swept volume of all cylinders combined.
cc
BMEP
1,570.8

Brake mean effective pressure - a size-independent measure of engine efficiency

Pressure unitkPa
BMEP (kPa)1,570.8kPa
Engine categoryTurbocharged gasoline (passenger car)
1,570.8 kPa
Very low / part-load<700Naturally aspirated700-1300Turbocharged1300-2200High-performance / motorsport2200+

BMEP: 1570.8 kPa

  • Your BMEP of 1570.80 kPa (1570.8 kPa) tells you how effectively the engine is filling and burning its swept volume.
  • This is in turbocharged gasoline or heavy-duty diesel territory - a respectable level achievable only with forced induction or very high compression.
  • Closest benchmark category: Turbocharged gasoline (passenger car).
  • BMEP is independent of engine size, so two engines with the same BMEP produce the same torque per litre of displacement.

Next stepPair this with a volumetric efficiency estimate or a dyno run to validate your result against real-world engine output.

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