Work out electricity unit conversion (kw to hp) instantly with clear inputs, formula shown and shareable results.
One mechanical horsepower is 745.6999 W and one metric horsepower (PS) is 735.49875 W, so the two differ by about 1.4%. Motor nameplates state shaft output, so applying efficiency gives the mechanical power actually delivered from a given electrical input.
Power conversion
1 hp = 745.6999 W; 1 PS = 735.49875 W; 1 kW = 3412.14 BTU/h
Electrical results are planning estimates only. Verify against the applicable wiring rules (IEC 60364, BS 7671, NEC or local code) and have all installation work designed and checked by a qualified electrician.
European and Asian motors usually state kW; US motors state mechanical hp. Automotive figures in Europe are often PS, which reads about 1.4% higher than hp.
No. Nameplate kW is shaft output, so electrical input is that divided by efficiency — a 7.5 kW motor at 90% draws about 8.3 kW.