100% free · Runs 100% in your browser · Watts, kilowatts & horsepower · No signup needed
Type in any field and the rest update instantly. 1 hp = 745.7 W; 1 kW = 1,000 W; 1 W = 0.001341 hp.
Try an example: 1,500 W = 1.5 kW = 2.01 hp
| What | Watts | Kilowatts | Horsepower |
|---|---|---|---|
| LED light bulb | ~10 | ~0.01 | ~0.013 |
| Laptop charger | ~65 | ~0.065 | ~0.087 |
| Hair dryer | ~1,500 | ~1.5 | ~2.01 |
| Electric kettle | ~2,000 | ~2 | ~2.68 |
| Car engine | ~111,855 | ~111.86 | ~150 |
Power is measured in several different units, and the unit you meet depends on where you look. A light bulb is rated in watts, a home appliance may be rated in kilowatts, and a car engine is usually rated in horsepower. The free Power Converter moves between all three in seconds. Type a value in watts, kilowatts, or horsepower, and the other two fields update instantly, so you can compare ratings, check an appliance, or understand what an engine figure really means. It runs entirely in your browser with no sign-up.
The confusion is understandable, because each unit grew up in a different world. Watts are the standard scientific unit of power, named after the engineer James Watt, and they are the unit printed on almost every electrical device you buy. Kilowatts are simply thousands of watts, and they are the unit used for larger loads such as heaters, cookers, and whole-home electricity use. Horsepower is the older unit, invented to compare early steam engines with the horses they replaced, and it survives today in cars, boats, and machinery. One horsepower is a lot of power for a person, about 745.7 watts, which is roughly the power of a strong hair dryer running at full heat.
The conversion between watts and horsepower rests on one fixed fact: 1 horsepower (hp) equals 745.7 watts. That single number is all the tool needs. To convert horsepower to watts, multiply the horsepower by 745.7. To convert watts to horsepower, divide the watts by 745.7, which is the same as multiplying by 0.001341, because 1 watt equals 0.001341 horsepower. Kilowatts sit in between and are the easiest step of all: 1 kilowatt equals 1,000 watts, so converting between watts and kilowatts is just a matter of moving the decimal point three places. The tool applies these factors for you, so you never have to remember them or reach for a calculator.
| Conversion | Formula | Result |
|---|---|---|
| 1 hp to watts | 1 x 745.7 | 745.7 W |
| 1 kW to watts | 1 x 1,000 | 1,000 W |
| 1 W to horsepower | 1 x 0.001341 | 0.001341 hp |
| 1 kW to horsepower | 1,000 / 745.7 | 1.341 hp |
| 1 hp to kilowatts | 745.7 / 1,000 | 0.7457 kW |
The table above shows the five conversions people use most, and each one follows from the same three facts. A kilowatt is 1,000 watts by definition, so 1 kW converts to about 1.341 horsepower, and 1 horsepower converts to about 0.7457 kilowatts. Notice how the numbers stay consistent in both directions: converting 1 hp to watts and back again returns you to 1 hp, because the tool uses the same factor both ways. That consistency matters when you are comparing specifications from different countries, because a motor rated at 2 kW in one catalogue and a motor rated at 2.7 hp in another are very close in power, and this converter lets you prove it in a second.
Here is the worked check the converter is built around. Take 2 horsepower and multiply by 745.7 watts per horsepower. The result is 2 times 745.7, which equals 1,491.4 watts, or about 1.49 kilowatts. That is the power of a large heater or a powerful vacuum cleaner, and it shows how quickly horsepower adds up in watts. Take a smaller value, such as 0.5 horsepower, and the same maths gives 0.5 times 745.7, which equals 372.85 watts, roughly the draw of a desktop computer under load. The pattern is linear, so doubling the horsepower always doubles the watts, and halving it always halves the watts.
The reverse direction works the same way. Take 1,500 watts, the rating of a typical hair dryer, and divide by 745.7 watts per horsepower. The result is 1,500 divided by 745.7, which equals 2.01 horsepower. So a hair dryer at full power is a two-horsepower machine, which sounds surprising until you remember that a horse can only sustain that effort for a short time. Take a larger load, such as a 3,000-watt heater, and the same division gives 3,000 divided by 745.7, which equals 4.02 horsepower. Take a small device, such as a 60-watt light bulb, and the result is 60 divided by 745.7, which equals 0.08 horsepower. These examples give you a feel for the scale: most household devices sit well below one horsepower, while engines sit far above it.
Power conversion comes up in more places than most people expect. Shoppers compare vacuum cleaners, heaters, and power tools rated in watts with older models rated in horsepower. Drivers compare car engines in horsepower with electric motors rated in kilowatts, because electric cars are often sold in kW while petrol cars are sold in hp. Students meet both units in physics lessons and need to switch between them for homework. If you need to convert other kinds of measurement, the Unit Converter handles length, weight, temperature, and more, and the Speed Converter switches between kilometres per hour, miles per hour, and other speed units.
A few familiar values make the units easy to picture. A hair dryer runs at about 1,500 watts, which is about 2.01 horsepower, as the worked example shows. A microwave oven uses roughly 1,000 watts, or about 1.34 horsepower, when it is cooking. A kettle draws about 2,000 to 3,000 watts, which is about 2.68 to 4.02 horsepower, and that is why kettles are among the hungriest devices in a home. A family car engine produces about 150 horsepower, which is about 111,855 watts, or about 111.9 kilowatts, and that figure explains why a car can do in seconds what a person could not do in a day. A small scooter engine of 5 horsepower is about 3,728.5 watts, while a large truck engine of 400 horsepower is about 298,280 watts, or about 298.3 kilowatts. Keeping these anchors in mind turns an abstract number into something you can feel.
That honest label matters, and this tool states it plainly. The values shown on screen are rounded for readability, so a result may show 2.01 horsepower where the exact figure has more digits. The tool says the full-precision value is used for the next conversion, not the rounded display, so converting back and forth does not lose accuracy step by step. In practice this means you can type a value, convert it, then type the converted value into another field, and the result will still be right. Rounding is a display choice, not a maths shortcut, and the underlying calculation keeps every digit it needs.
If you enjoy comparing numbers and explaining them to others, a website is a great place to publish your guides and reviews. Whether you write about cars, tools, or home appliances, you can share your comparisons online with FistHost shared hosting from just $0.99/month, with a free domain included with the annual plan. Set up your site at FistHost and publish your buying guides, your conversion charts, and your hands-on tests for readers who want clear answers.
Always check whether a rating is input power or output power, because the two are not the same. An electric motor may draw 1,500 watts from the wall but deliver less as useful work, because some energy is lost as heat and friction. Compare like with like, in the same unit and the same kind of rating, and use this converter to put both figures into one unit before you judge which is bigger.
How many watts are in one horsepower? One horsepower equals 745.7 watts. Multiply any horsepower figure by 745.7 to get watts, so 2 hp equals 1,491.4 W and 10 hp equals 7,457 W. To go the other way, divide watts by 745.7, so 1,500 W equals 2.01 hp.
How many watts are in a kilowatt? One kilowatt equals 1,000 watts exactly. A 2 kW appliance uses 2,000 watts, and a 500 W device uses 0.5 kW. Kilowatts are simply a shorter way of writing large watt figures, in the same way that kilometres are a shorter way of writing large metre figures.
Whether you are comparing engines, checking an appliance, or finishing physics homework, this converter turns watts, kilowatts, and horsepower into one another without fuss. Type a number, read the answer, and move on. And if you want to share your own guides and comparisons online, FistHost shared hosting starts at just $0.99/month with a free domain included with the annual plan, so you can launch your site today at FistHost and publish for readers who want the numbers explained clearly.
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