What this conversion means in practice
Legacy hp figures from automotive forums need kW for efficiency metrics, EU compliance sheets, or generator sizing in SI-first regions.
The exact relationship here is 1 hp = 0.745699871582 kW, consistent with expressing both units relative to watts (W).
How to convert horsepower (imperial mechanical) to kilowatt
Multiply the horsepower (imperial mechanical) value by 0.745699871582 to get kilowatt.
Example: 1 hp × 0.745699871582 = 0.745699871582 kW.
Horsepower (imperial mechanical) and Kilowatt
This focused page locks to the unit pair above so you can quote or audit one factor without scrolling the full dropdown list. For context on other rows, open the parent converter from the site navigation.
Horsepower (imperial mechanical) to Kilowatt conversion table
| Horsepower (imperial mechanical) (hp) | Kilowatt (kW) |
|---|---|
| 0.1 hp | 0.074569987158 kW |
| 1 hp | 0.745699871582 kW |
| 2 hp | 1.491399743165 kW |
| 5 hp | 3.728499357911 kW |
| 10 hp | 7.456998715823 kW |
| 20 hp | 14.913997431646 kW |
| 50 hp | 37.284993579114 kW |
| 100 hp | 74.569987158229 kW |
Horsepower (imperial mechanical) to Kilowatt FAQ
hp to kW: mechanical versus metric hp cautions at a glance.
How do I convert hp to kW?
Multiply the value in hp by 0.745699871582 to obtain kW. That factor is the ratio of the two units in the same base system as the site’s full converter.
Is this factor the same as the main converter tool?
Yes. The numeric relationship uses the same unit definitions and base normalization as the corresponding converter on CalcRegistry.
Why might my hand calculation differ slightly?
Rounding after intermediate steps, display precision limits, or mixing alternate definitions (for example different “horsepower” variants) can shift the last digits. Use this page’s factor end-to-end for consistency.