Power Converter

Convert between watts and other practical power units.

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Related Conversions
1 mW to kW 5 mW to kW 20 mW to kW 75 mW to kW 100 mW to kW 200 mW to kW 230 mW to kW 250 mW to kW 282 mW to kW 410 mW to kW 500 mW to kW 1,000 mW to kW
Reverse Conversions
2 kW to mW 5 kW to mW 20 kW to mW 25 kW to mW 50 kW to mW 100 kW to mW 150 kW to mW 230 kW to mW 282 kW to mW 307 kW to mW 1,024 kW to mW 5,120 kW to mW
More Power Conversions
1 GW to MW 10 kW to hp 150 W to BTU/h 200 hp to kW 750 W to BTU/h 1,000 kW to hp 2,000 hp to kW 5,000 hp to kW 12,000 BTU/h to kW 18,000 BTU/h to kW 24,000 BTU/h to kW 100,000 W to BTU/h

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Watts to Horsepower Horsepower to Watts Watts to Kilowatts Kilowatts to Watts Kilowatts to Horsepower Horsepower to Kilowatts BTU Per Hour to Watts Watts to BTU Per Hour BTU Per Hour to Kilowatts Kilowatts to BTU Per Hour

Common Benchmarks

Hair dryer 1800 W
Car engine 100 hp
E-bike motor 500 W
Microwave 1000 W
Phone fast charge 30 W
Air conditioner 3500 W

Formula

kW = mW × 0.000001

Example

Example: convert 256 milliwatts to kilowatts.

256 mW = 0.000256 kW

Conversion table

milliwatts (mW) kilowatts (kW)
1 mW 0.000001 kW
2 mW 0.000002 kW
5 mW 0.000005 kW
10 mW 0.00001 kW
20 mW 0.00002 kW
50 mW 0.00005 kW
100 mW 0.0001 kW

Explanation

These are both units.

How to convert milliwatts to kilowatts

  1. Start with the value in milliwatts (mW).
  2. Multiply it by 0.000001.
  3. The result is the measurement in kilowatts (kW).

Example: 256 mW → 0.000256 kW

Frequently Asked Questions

How much is 256 milliwatts in kilowatts?

256 milliwatts equals 0.000256 kilowatts.

How many kilowatts is 1 milliwatt?

1 milliwatt equals 0.000001 kilowatts.

How many milliwatts is 1 kilowatt?

1 kilowatt equals 1000000 milliwatts.

What is the difference between milliwatts and kilowatts?

Both measure power, but they are commonly used in different contexts. The watt (W) is the SI unit and is widely used in electrical/device specs, while horsepower (hp) is a traditional unit often used to describe engines and machinery.

Where are milliwatts and kilowatts used?

Watts are common in electrical power/consumption (devices, appliances, lighting). Horsepower is commonly used for mechanical power (engines, pumps, compressors, machinery).

Why does 1 milliwatt equal 0.000001 kilowatts?

Because power units are defined with a fixed relationship, which determines the conversion factor.