Power Converter
Convert between watts, kilowatts, horsepower and BTU/hr.
Convert between watts, kilowatts, horsepower and BTU/hr.
This free Power Converter from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the Power Converter
- Pick the unit you have and the unit you want.
- Enter the value.
- Read the converted value - most tools update as you type.
- Use the swap button to reverse the direction if needed.
What you can do with the Power Converter
- Convert recipe ingredients between metric and imperial.
- Translate engineering specs across systems.
- Check shipping weights and dimensions before ordering.
- Quick travel conversions for distance, speed and currency.
Why use KX Toolkit's Power Converter
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
For very large or very small numbers, use the scientific-notation option - it avoids floating-point rounding errors.
Related Unit Converter Tools
If you find this tool useful, explore the full Unit Converter Tools collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.
How do I convert horsepower to watts?
Multiply mechanical horsepower by 745.7 to get watts. So a 200 hp car engine produces about 149 kW. Metric horsepower (PS, used in Europe) is slightly different at 735.5 W. Always check which "horsepower" a manufacturer uses, especially when comparing cars. The converter supports mechanical, metric, and electrical horsepower distinctly.
What is the difference between watts and watt-hours?
Watts measure power, the rate of energy use, while watt-hours measure energy, the total used. A 100 W bulb on for 10 hours uses 1,000 Wh or 1 kWh. Power is instantaneous; energy is power times time. Use the power converter for ratings (W, kW, hp) and the energy converter for totals (Wh, kWh, J).
How big is a BTU per hour?
One BTU/hr equals about 0.293 W. A 12,000 BTU/hr air conditioner is therefore around 3.5 kW of cooling capacity. AC units in the US are rated in BTU/hr, while elsewhere they are rated in kW. The converter quickly translates between them, which is useful when shopping internationally or comparing efficiency ratings.
What is a typical home electrical capacity?
A standard US home has a 200 amp service at 240 V, which is 48 kW peak. UK homes typically have a 100 amp 230 V service, around 23 kW. Individual circuits are 1.5-3 kW. Use the converter to translate between watts, amps, and horsepower when sizing appliances, generators, or solar inverters.
Why are there several "horsepower" definitions?
James Watt picked the original mechanical horsepower (550 ft-lbf/s, 745.7 W). Engineers later standardised metric horsepower (PS = 735.5 W) and electrical horsepower (746 W exactly). Boiler horsepower is yet another unit (9.81 kW). The differences are small but real, so industry context matters. The converter labels them clearly.
How do I convert watts to kilowatts?
Divide by 1,000. So a 1,500 W heater is 1.5 kW, and a 60 W bulb is 0.06 kW. Going the other way, multiply kW by 1,000. The kilowatt is the practical unit for appliances, vehicles, and home energy, while the megawatt (1,000 kW) is used for industrial loads and power plants.
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