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Power Converter

Watts, kilowatts, horsepower and BTU/hour conversions.

Best for: Use it for engines and motors (hp/kW), appliances (W), or air-conditioning (BTU/h).

Complete guide

Input

From
To
How it's calculated & sources
The Power Converter uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

Watt = Joule per second. 1 hp ≈ 745.7 W mechanical, 735.5 W metric.

Example

100 kW ≈ 134.1 hp.

Frequently asked questions

Is conversion real-time?+

Yes — values update instantly as you type in either field, with full bidirectional input.

Where does the power reference come from?+

All factors are SI-anchored using internationally accepted conversions.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Power?
A power converter changes power between watts, kilowatts, horsepower and BTU per hour.
Why does Power matter?
The same power (energy per unit time) in your target unit.
How is Power calculated?
Each value is converted through watts (the SI unit) and then to your chosen unit. Formula: 1 kW = 1,000 W = 1.341 hp; 1 mechanical hp = 745.7 W; 1 metric hp = 735.5 W; 1 BTU/h = 0.293 W.
What are common power mistakes?
Mixing mechanical horsepower (745.7 W) with metric hp (735.5 W).
When should you use the Power Converter?
Use it for engines and motors (hp/kW), appliances (W), or air-conditioning (BTU/h).

What is the Power Converter?

A power converter changes power between watts, kilowatts, horsepower and BTU per hour.

How the Power Converter works

Each value is converted through watts (the SI unit) and then to your chosen unit.

1 kW = 1,000 W = 1.341 hp; 1 mechanical hp = 745.7 W; 1 metric hp = 735.5 W; 1 BTU/h = 0.293 W

Power conversions — watts, kilowatts, horsepower (metric & mechanical)

1000.10.13410.136
5000.50.67050.6798
7460.74611.01
100011.341.36
500056.716.8
100001013.4113.6

Common mistakes to avoid

  • Mixing mechanical horsepower (745.7 W) with metric hp (735.5 W).
  • Confusing power (kW) with energy (kWh).
  • Comparing 'peak' and 'continuous' ratings as if equal.

Keywords: power, watt, horsepower.

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Power Converter free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Power Converter?+

Power Converter uses the standard power formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Power Converter runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Power Converter on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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# Power Converter — the free tool I keep coming back to

Watts, kilowatts, horsepower and BTU/hour conversions.

Try it: https://freetoolsgalaxy.com/tools/power-converter
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The fastest way is to use a free in-browser power converter: https://freetoolsgalaxy.com/tools/power-converter. Watts, kilowatts, horsepower and BTU/hour conversions.

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