HP to kW Converter
Convert horsepower to kilowatts for US motors, vehicles, and engineering specs.
How It Works
Formula: hp to kW = value × 0.745699872
Example: 1 hp = 0.7457 kW
Note: 1 mechanical horsepower equals 0.7457 kilowatts, the conversion for US motors and vehicles.
Common Uses
Rounding Rule
Rounded to 4 decimal places
Error Margin
±0.0001 kW
Precision Guidance
For vehicles, round to 2 decimals. For engineering, keep 3-4 decimals.
Common Mistakes
Mechanical horsepower (0.7457 kW) differs from metric horsepower/PS (0.7355 kW). Confirm which a spec uses.
Frequently Asked Questions
What is 1 hp in kW?
1 mechanical horsepower equals 0.7457 kilowatts (1 hp = 0.7456999 kW).
How do I convert hp to kW?
Multiply the horsepower value by 0.7457. For example, 100 hp × 0.7457 = 74.57 kW.
Is this mechanical or metric horsepower?
This uses mechanical (imperial) horsepower (0.7457 kW). Metric horsepower (PS) is 0.7355 kW.
Why do EVs use kW?
Electric vehicles rate motors in kilowatts, the SI unit, while US cars often cite horsepower for comparison.
Deep Dive Guide
HP to KW: Converting Horsepower to Kilowatts for US Cars and EVs
Convert hp to kw for US car specs, truck ratings, and EV motors. 1 mechanical horsepower equals 0.7457 kW, the standard American automakers use.
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Last Updated 2026 | This converter was reviewed for accuracy