// conversions › 1 · Basic Converters
Convert power between watts, kW, MW, mechanical and metric horsepower via the watt.
result = value × (from→W) ÷ (to→W)
It converts convert power between watts, kw, mw, mechanical and metric horsepower via the watt by first normalising your value to the SI base unit (watt) and then scaling to your chosen target unit. This hub-and-spoke approach guarantees every unit pair is internally consistent.
150 mech hp to kW: 150 × 745.7 = 111855 W, then ÷ 1000 ≈ 111.86 kW.
Mechanical (imperial) horsepower is 745.7 W; metric horsepower (PS/CV on European cars) is 735.5 W. They differ by about 1.4%, so a 100 hp and a 100 PS engine are not quite identical.
Automotive (hp), electrical engineering and renewable generation.
Conversions are exact ratios where the units are defined exactly (most SI and imperial units) and best-available constants otherwise. Extremely large or small magnitudes are shown in general (g) format; round-tripping through the base unit may introduce tiny floating-point differences in the final decimal places.