FluffyBench

Power Converter

Convert watts, kilowatts and mechanical horsepower. One mechanical horsepower is 550 ft·lbf/s, about 745.7 W, and differs from metric horsepower.

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From
To

Convert to

Units

WattWFrom
KilowattkWkW
Mechanical horsepowerhphp

Other quantities have their own pages: Length, Mass, Temperature, Area, Volume, Speed, Pressure, Energy and Data size.
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How many watts is a horsepower?

Comparing a motor's horsepower with a watt rating? Put both in the same unit: one mechanical horsepower is about 745.7 watts. FluffyBench's Power Converter does that math as you type.

FluffyBench · 4 min read · Reviewed

How it works
  1. Choose the unit on your rating
  2. Choose the unit you need
  3. Type the number
  4. Read or copy the answer

Three power units

Watt (W), Kilowatt (kW), Mechanical horsepower (hp).

Every unit at once

The result list also gives your value in the other power units, each with its own Copy button.

On your device

FluffyBench converts your number on this page, without sending it anywhere for conversion.

Limits Input value takes a number; the unit goes in From.

What do watts and kilowatts measure?

Think of filling a bucket: the faucet's flow is power, and the water that collects is energy. A watt is one joule of energy every second, and a kilowatt is 1,000 watts.

A faucet pours into a bucket. The flow is labeled power, in watts or kilowatts; the water collected is labeled energy, in kilowatt-hours. Below: 1 kW = 1,000 W, and 1 kW for 1 hour = 1 kWh.
Watts and kilowatts measure the flow; kilowatt-hours measure what collects. How we measured

So a kW rating tells you how fast, and a kWh figure tells you how much. Watts, kilowatts and horsepower all measure the flow, which is why FluffyBench's Power Converter can swap between them. A number in kWh is an energy total, and that's a job for FluffyBench's Energy Converter.

Need to convert accumulated energy to another unit?

Need to convert speed separately from power?

Converting horsepower to watts in FluffyBench

Here's a 2 hp rating turned into watts, from choosing the units to copying the answer.

  1. The From list offers Watt, Kilowatt and Mechanical horsepower.
    The From list offers Watt, Kilowatt and Mechanical horsepower.
    Step 1. Open From and pick the unit on your rating. The list has three units, and picking one closes it.
    1. Choose Mechanical horsepower for an hp rating.
  2. From shows Mechanical horsepower and To shows Watt.
    From shows Mechanical horsepower and To shows Watt.
    Step 2. Open To the same way and pick the unit you need.
    1. From now reads Mechanical horsepower.
    2. Choose Watt under To.
  3. Input value is 2 and its unit reads mechanical horsepower.
    Input value is 2 and its unit reads mechanical horsepower.
    Step 3. Type the number from your rating. The answer updates as you type; there's no Convert button.
    1. Type 2 in Input value.
    2. The input is in mechanical horsepower.
  4. The result is 1,491.3997431645 watts with Copy above it; the list below shows the same power in kilowatts.
    The result is 1,491.3997431645 watts with Copy above it; the list below shows the same power in kilowatts.
    Step 4. Read the answer in watts. Need kilowatts instead? It's in the list below, with its own Copy button.
    1. Read 1,491.3997431645 watts.
    2. Copy takes the watts number.
    3. Kilowatts has its own row and Copy button.

If you see “Enter a decimal number for Value.”, take the unit and any commas out of Input value. If FluffyBench says Copy was unavailable, select the result and copy it yourself.

Which horsepower is on your rating?

FluffyBench's hp is mechanical horsepower, about 745.7 W. A rating marked PS (metric horsepower) is about 10 W smaller, and electrical horsepower is 746 W.

Three dots on a watt scale from 730 to 750: metric horsepower (PS) at 735.5 W, mechanical horsepower at 745.7 W, about 10 W further along, and electrical horsepower at 746 W.
Run a PS rating through the mechanical choice and the watts come out about 1.4% too high.

The From list has no PS or electrical choice, so turn those ratings into watts first by multiplying by their own factor.

Worked examples: 100 PS × 735.49875 = 73,549.875 W, and 2 electrical hp × 746 = 1,492 W.
Each multiplication gives watts, ready for FluffyBench's Power Converter.

Then convert those watts with Watt under From. Here's the 100 PS example in kilowatts.

  1. From shows Watt and To shows Kilowatt.
    From shows Watt and To shows Kilowatt.
    Step 1. Start from the watts you worked out: Watt under From, Kilowatt under To.
    1. Choose Watt under From.
    2. Choose Kilowatt under To.
  2. Input value is 73549.875 and its unit reads watts.
    Input value is 73549.875 and its unit reads watts.
    Step 2. Type the watts without commas.
    1. Type 73549.875 in Input value.
  3. The result reads 73.549875 kilowatts.
    The result reads 73.549875 kilowatts.
    Step 3. A 100 PS rating is about 73.5 kW.
    1. Read 73.549875 kilowatts.

Check the answer before you paste it

Copy gives the plain number, without thousands commas or a unit. Add W where you paste it, unless the field is already labeled in watts.

A real FluffyBench result shows 1,491.3997431645 watts with Copy. The clipboard holds 1491.3997431645. An illustrated note reads Motor: 1491.3997431645 W, with the W typed by hand.
A field already labeled W takes the number as it is; a note needs the W beside it.
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