SpecCalc Hub
kW to HP Converter
Convert kilowatts to mechanical horsepower and back.
Interactive block
Client-side estimate. SpecCalc Hub does not store entered values.
Formula: hp = kW / 0.745699872
Reference formula
This simplified formula block is educational and depends on the page status and limitations.
hp = kW / 0.745699872
Assumptions
- Inputs are user-provided.
- The result is an informational estimate.
Limitations
- Uses mechanical horsepower.
What this page helps with
kW and horsepower both describe power, but they are often used in different purchasing and maintenance contexts. Motor nameplates, pump catalogs and mechanical brochures may switch between them, so a clean conversion avoids mismatched comparisons.
This converter helps when you want to compare a metric electrical value with a motor or engine listing that still uses horsepower.
Formula or method
The working method on this page uses inputs such as Kilowatts and Horsepower and reports outputs such as kW to hp and hp to kW. The formula, assumptions and limitations stay visible so the result can be reviewed instead of simply trusted.
This makes the page useful for comparison and documentation, but it does not automatically include every manufacturer coefficient, installation condition, environmental factor or local-code requirement that may matter in a real project.
How to use
- Enter the known value in kilowatts or horsepower and read the converted result on the same page.
- Treat the output as a unit conversion first, not as a full motor performance statement.
- If you are comparing motors, check whether the quoted value is shaft output power, electrical input power or a marketing rating.
Practical examples
Example 1: 7.5 kW motor comparison
A 7.5 kW rating converts to roughly 10.06 hp using mechanical horsepower. This is useful when one supplier lists kW and another lists hp for a similar machine.
Example 2: hp back to kW
If a datasheet shows 15 hp, the equivalent is about 11.19 kW. You still need efficiency and power-factor checks if you are estimating electrical input current.
Common mistakes
- Mixing shaft output power with electrical input power.
- Assuming horsepower alone is enough for current or breaker selection.
- Ignoring which horsepower convention is being used.
Limitations
- This page converts units only; it does not estimate efficiency, torque or starting current.
- Mechanical and electrical ratings must still be verified from the equipment datasheet.
- Use motor current or motor power tools for broader electrical planning.
FAQ
Is 1 hp always the same as 0.746 kW?
For mechanical horsepower, that is the usual engineering approximation. Some regions also mention metric horsepower, so the convention should be checked in the source document.
Can I size a feeder from hp alone?
No. You also need voltage, phase type, efficiency, power factor and local electrical rules.
Why do catalogs still use hp?
Because many motor, pump and engine markets still publish legacy mechanical ratings in horsepower.
Related tools
Last reviewed: 2026-06-05
This calculator provides an estimate for informational purposes only. It is not a certified engineering design, electrical safety approval, or professional installation recommendation. Always verify final decisions with a qualified professional and applicable local codes.