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Watts to Milliwatts Converter

Convert watts to milliwatts and milliwatts to watts instantly. Bidirectional power converter with formula and common values.

W

Milliwatts

250

mW

0.25 W = 250 mW

mW = W × 1,000

Watts to Milliwatts: 1 W equals 1000 mW. To convert watts to milliwatts, multiply by 1000 (mW = W × 1,000). For example, 10 W = 10000 mW.

How to Convert Watts to Milliwatts

To convert from watts to milliwatts, multiply the value by 1000. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Watts to Milliwatts: mW = W × 1,000
  • Milliwatts to Watts: W = mW ÷ 1,000

Watts to Milliwatts Conversion Chart

Watts (W)Milliwatts (mW)
0.1100
0.25250
0.5500
11000
22000
33000
55000
1010000
2020000
2525000
5050000
100100000
250250000
10001000000

Understanding the Units

What is a Watt?

The watt is the SI derived unit of power, equal to one joule per second (1 W = 1 J/s = 1 V·A).

Named after James Watt (1736–1819), the Scottish engineer whose improvements to the steam engine helped drive the Industrial Revolution.

Common contexts: electricity, mechanics, lighting.

What is a Milliwatt?

A milliwatt equals one thousandth of a watt (10⁻³ W).

Common contexts: radio transmitters, lasers, electronics.

Real-World Reference Points

Item Watts (W) Milliwatts (mW)
LED bulb99000
Incandescent bulb (old)6060000
Microwave oven10001000000

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FAQ

How many milliwatts are in a watt?

One watt equals 1,000 milliwatts.

Where are milliwatts used?

Milliwatts are common in electronics, laser power ratings, radio transmitter output, Bluetooth device specifications, and sensor power consumption.

How do I convert watts to milliwatts?

Multiply the watt value by 1,000. For example, 0.25 W = 250 mW.

How many milliwatts are in 1 watt?

1 W equals 1000 mW.

How do you convert watts to milliwatts?

Multiply the watt value by 1000. Formula: mW = W × 1,000.

How many milliwatts are in 5 watts?

5 W = 5000 mW.

How do you convert milliwatts back to watts?

Use the inverse formula: W = mW ÷ 1,000. For example, 1 mW = 0.001 W.

What is the difference between Watt and Milliwatt?

The watt is the SI derived unit of power, equal to one joule per second (1 W = 1 J/s = 1 V·A). A milliwatt equals one thousandth of a watt (10⁻³ W).