Zerdly

Power Converter

Convert power between watts, kilowatts, horsepower and BTU per hour instantly and for free with this simple browser-based power converter.

100% FreeRuns in your browserBasic
How to use this calculator

Convert power

Amount to convert
From (the unit you have)
To (the unit you want)

Result

0.001

1 Watts (W) = 0.001 Kilowatts (kW)

All units

Watts (W)
1
Kilowatts (kW)
0.001
Megawatts (MW)
1.0000e-6
Horsepower (hp)
0.001341
BTU per hour (BTU/h)
3.412142

Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.

How to use this calculator

  1. Enter the amount you want to convert.
  2. Choose the unit you have (From) and the unit you want (To).
  3. Read the result instantly — every other unit is listed too.

How it works

Converts between kilowatts, watts, horsepower (1 kW ≈ 1.341 hp) and BTU per hour.

Worked example

1 kW. ≈ 1.34 horsepower.

Common mistakes

  • Confusing power (W) with energy (Wh) — energy is power × time.
  • Mixing mechanical and metric horsepower (they differ slightly).

Frequently asked questions

How many watts in 1 horsepower?

About 746 W for mechanical hp; metric hp is about 735 W.

Power vs energy?

Power is the rate (watts); energy is power used over time (watt-hours).

How many horsepower are in a kilowatt?

About 1.341 hp, so 100 kW ≈ 134 hp. (This uses mechanical/imperial horsepower.)

How accurate are the conversions?

They use standard conversion factors at full device precision, so they're reliable for everyday and professional use.

Does it work offline and stay private?

Yes — the conversion runs entirely in your browser, with no sign-up and nothing sent to a server.

Related tools

Explore more in Units, Measurement & Converters.

Cite this tool

Zerdly. (2026). Power Converter. Retrieved from https://www.zerdly.com/tools/power-converter/

Tip: Enter any known values to calculate the remaining results.

All calculations run in your browser. Your inputs are never saved or transmitted.