How to use this tool
- Enter a power value from zero to one billion. Select kW or metric PS as its input unit.
- Run the converter to see kilowatts, metric horsepower and watts. The example uses 100 kW.
- Review the reference table or save the JSON calculation report. Change the value or unit and run again for a new result.
Check the built-in example
The built-in example converts 100 kW to 135.962162 PS after rounding to six decimal places. The same power is 100000 W. Divide 100000 by 735.49875 to reproduce the PS result independently. In the reverse direction, 100 PS equals 73.549875 kW. The table includes both 100 kW and other common ratings, so you can compare the selected result with nearby values.
Processing method
One metric horsepower is the power of 75 kilogram-force metres per second. Standard gravity is 9.80665 metres per second squared, giving 75 × 9.80665 = 735.49875 watts per PS. Kilowatts are converted to watts before division by this factor. For PS input, multiplication gives watts first. The linked NIST table lists metric horsepower separately from mechanical horsepower and rounds its watt factor for display. This converter derives the longer factor from the metric definition. The report retains the calculated numbers before the six-decimal presentation rounding.
Reference: NIST SP 811: power conversion factors
What the result leaves out
PS here always means metric horsepower. Mechanical hp, bhp and electrical horsepower are different conventions and are not accepted as input units. A unit conversion cannot infer torque, engine speed, fuel use, drivetrain loss or the power measured at the wheels. The reference table contains mathematical conversions, not approved vehicle specifications. Zero is valid; negative values, empty input and non-finite numbers are rejected. Results use ordinary floating-point arithmetic and are displayed to at most six decimals. Extra digits do not improve the accuracy of an original rounded rating.
Checking local processing
The numeric calculation runs in your browser without an account or document upload. The JSON report is created locally and includes your input, both converted units, watts, the conversion factor and the reference rows. Reset clears the displayed result and its download link. A report you already saved stays on your device. Your browser Network panel can confirm that running another conversion sends no power value to a calculation service.
Common questions
Are PS and hp interchangeable?
No. This page uses metric PS, about 735.5 W per unit. Mechanical horsepower uses a different watt factor.
Does a change of unit change engine power?
No. It expresses the same power with another unit. It does not measure or modify the engine.
Why can a car document show a slightly different PS value?
The original kW rating or the displayed PS figure may be rounded. Compare the same measurement basis and source specification.