Physics

BMEP Calculator (Brake Mean Effective Pressure)

Find brake mean effective pressure from torque and displacement.

Torque (N·m)

Displacement

Engine cycle

Calculated Output

BMEP (kPa) 1,256.64

BMEP (bar) 12.566

Formula: BMEP = 2π·n_c·T ÷ V_d

Step-by-Step Breakdown

1. Values used:

2. Torque = 200 N·m

3. Displacement = 2

5. BMEP = 1,256.64kPa

6. BMEP = 12.566bar

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The math behind it

BMEP = 2π·n_c·T ÷ V_d, where n_c is revolutions per power stroke (2 for a 4-stroke).

200 N·m from a 2.0 L 4-stroke → about 1257 kPa (12.6 bar).

What's a high BMEP?

Naturally aspirated engines ~10–12 bar; turbocharged ones can exceed 20 bar.