kW to km/h Calculator
Estimate an electric vehicle's speed in km/h from motor power and weight.
This calculator estimates a vehicle's speed in km/h from its motor power in kilowatts and its weight — handy for electric vehicles, which are usually rated in kW rather than horsepower.
How It Works
Electric motors are rated in kilowatts, so this tool converts to horsepower first, then applies the same power-to-weight speed estimate used for combustion cars. Real EV top speed is often electronically limited below this figure for efficiency and range.
How to Use This Calculator
- Enter motor power in kW.
- Enter weight in kilograms.
- Read estimated speed in km/h and MPH.
Worked Example
Frequently Asked Questions
Convert kilowatts to horsepower (×1.341), then estimate speed from the power-to-weight ratio. The calculator does both steps automatically.
Kilowatt is the SI unit for power and is standard for electric motors worldwide. Many makers also quote the horsepower equivalent for familiarity.
Not necessarily. Many EVs are electronically limited below their theoretical maximum to protect range, motor, and tires.
About 201 mechanical horsepower, since 1 kW equals roughly 1.341 HP.
Through power-to-weight, yes, especially in acceleration. At high speed, aerodynamic drag becomes the dominant factor.