Watts to Horsepower Converter
Enter a value to instantly convert between power units.
1 Watt = 0.0013 Horsepower (mech)
Key Formulas
Kilowatt → Horsepower (mech)
hp = kW × 1.34102Horsepower (mech) → Kilowatt
kW = hp × 0.7457Watt → Kilowatt
kW = W × 0.001Kilowatt → Watt
W = kW × 1000Formula
hp = W × 0.00134102One watt equals 0.001341 mechanical horsepower. Since 1 hp = 745.69987 watts by definition, dividing gives 0.001341 hp per watt. This conversion is essential for comparing electric motor ratings (given in watts) to mechanical requirements (specified in horsepower), and understanding the relationship between SI power units and traditional mechanical engineering specifications.
Source: NIST SP 811, Table B.8
Frequently Asked Questions
Real-World Examples
A 746 W electric motor = 1 hp (by definition, nearly exact).
746 W = 1.0001 hp
A 3700 W submersible pump = 4.96 hp for pump specifications.
3700 W = 4.9641 hp
Household utility tool rated 1000 W = 1.34 hp for comparison with gas-powered alternatives.
1000 W = 1.341 hp
Industrial compressor 5000 W = 6.7 hp for motor selection and load analysis.
5000 W = 6.7051 hp