Power Converter for Watts, Horsepower, and BTU/h
This power converter turns any value into every other power unit at once, so you can switch between Watts, kilowatts, horsepower, and BTU/h without doing the math by hand. Type a number, pick its unit, and read all the conversions instantly.
It is built for car enthusiasts comparing engine ratings, electricians and engineers sizing motors, HVAC technicians working in BTU/h or tons of refrigeration, and anyone matching appliance, generator, or solar wattage. The full list spans metric, horsepower, BTU-based, and scientific units.
How to Use the Power Converter
Enter a value
Type a number into the input field. Large numbers are formatted with thousand separators automatically so they stay easy to read.
Pick your source unit
Open the unit dropdown and choose your starting unit. Start typing a name or symbol like hp or kilowatt to filter the list. Use the swap button to flip the two converter units.
Read every result
All enabled units update in real time below, grouped by category. Open Customize Units to show only the units you care about, and set Decimals to 2, 4, 6, 8, or Auto.
Copy what you need
Click the copy button on any row to grab a single value, or use Copy All Results to copy every conversion at once. Open Unit Reference to see what each unit means and where it is used.
Features
Instant Conversion
Results update the moment you type. No button to press and no waiting, just enter a value and see every conversion right away.
Comprehensive Unit Support
Convert across metric, horsepower, BTU-based, and scientific units, from Watts and kilowatts to mechanical horsepower, BTU/h, and tons of refrigeration.
Smart Input Formatting
Large numbers are grouped with thousand separators as you type, making long values easier to read and verify.
Searchable Unit Selection
The unit dropdown has a built-in search. Type a name or symbol such as "hp" or "kilowatt" to jump straight to the unit you need.
Customizable Display
Toggle which units appear in your results by group, so you can focus on just the metric, horsepower, or BTU units that matter to you.
Precision Control
Choose 2, 4, 6, or 8 decimal places, or use Auto. Higher precision suits engineering work; lower keeps results clean and readable.
One-Click Copy
Copy a single result or every result at once in a clean format, ready to paste into documents, spreadsheets, or technical reports.
Quick Unit Swap
Flip the two converter units with one tap to reverse the direction of a conversion without retyping anything.
Unit Reference Guide
A built-in panel explains each unit's value and typical use, handy for less familiar units like Boiler Horsepower or Ton of Refrigeration.
Private and Responsive
Every calculation stays in your browser and the layout adapts to desktop, tablet, and mobile, so you can convert anywhere.
Frequently Asked Questions
How many watts are in 1 horsepower?
One mechanical horsepower (hp) equals about 745.7 watts. One metric horsepower (PS), common in Europe, equals about 735.5 watts. Enter 1 in either hp or PS to see the exact watt value.
How do I convert kW to horsepower?
Enter your value in kilowatts and read the hp (mechanical) or PS (metric) row. As a quick guide, 1 kW is about 1.341 hp or 1.36 PS, so a 100 kW motor is roughly 134 hp or 136 PS.
How many watts are in a kilowatt?
One kilowatt (kW) equals exactly 1,000 watts. The metric units scale by powers of ten: 1 MW = 1,000 kW = 1,000,000 W, and 1 GW = 1,000 MW.
What is the difference between metric and mechanical horsepower?
Mechanical horsepower (hp) is used in the US and UK and equals 745.7 watts. Metric horsepower (PS), from the German "Pferdestärke," equals 735.5 watts and is used across Europe and Asia. When comparing cars: 100 hp is about 101.4 PS, and 100 PS is about 98.6 hp.
Is BTU the same as BTU/h?
No. A BTU is a unit of energy, while BTU per hour (BTU/h) is a unit of power, meaning energy per unit of time. This converter handles power units, so it works with BTU/h, BTU/min, and BTU/s. One BTU/h equals about 0.293 watts, and a 12,000 BTU/h air conditioner is roughly 3,517 watts.
What is a Ton of Refrigeration (TR)?
A Ton of Refrigeration is a unit of cooling capacity equal to 12,000 BTU/h, or about 3,517 watts. It comes from the cooling power of melting one ton of ice in 24 hours and is used mainly for commercial HVAC systems.
What is Boiler Horsepower?
Boiler horsepower (bhp) measures steam boiler output capacity and equals about 9,809.5 watts, or roughly 33,475 BTU/h. It is far larger than mechanical horsepower, with one boiler hp equal to about 13 mechanical hp.
How accurate are the conversions?
Conversions use internationally recognized conversion factors and are accurate to many decimal places. Use the Decimals selector to display as much or as little precision as you need for your work.
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