Engine Torque Curve Calculator

Estimate engine torque at a given RPM using a parabolic torque curve model based on peak torque RPM and redline.

Input Parameters

Results

--
Torque at Target RPM
lb-ft
--
HP at Target RPM
hp
--
% of Peak Torque
%
--
Est. BMEP
psi
Note: This parabolic model approximates a naturally aspirated torque curve. Turbocharged engines have a flatter torque plateau. SAE J1349 defines standard test conditions.

Reference

T(N) = T_peak × [1 − 0.5 × ((N − N_peak)/(N_redline − N_peak))²] HP = Torque × RPM / 5252 BMEP = Torque × 75.4 / Displacement (L) SAE J1349 standard conditions