Science & Engineering

Mechanical Units Conversion

Force, pressure, torque, energy, power — imperial ↔ metric conversion factors.

Force

FromToFactor
Nlbf× 0.2248
lbfN× 4.448
kgfN× 9.807
kNlbf× 224.8

Pressure / stress

FromToFactor
Papsi× 1.45 × 10⁻⁴
psikPa× 6.895
kPapsi× 0.1450
MPapsi× 145.04
barpsi× 14.50
atmkPa× 101.325
atmpsi× 14.696
mmHgPa× 133.322
inHgkPa× 3.386

Torque

FromToFactor
N·mlb-ft× 0.7376
lb-ftN·m× 1.356
N·mlb-in× 8.851
kgf·mN·m× 9.807

Energy

FromToFactor
Jcal× 0.2390
kJBTU× 0.9478
kWhMJ× 3.6
kWhBTU× 3 412
ft-lbfJ× 1.356
eVJ× 1.602 × 10⁻¹⁹

Power

FromToFactor
Whp× 0.001341
kWhp× 1.341
hpkW× 0.7457
Btu/hW× 0.2931
ton (AC)kW× 3.517
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