Watt to Milliwatt

Convert watt to milliwatt instantly. Type in either field — results update live.

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Power Watt Milliwatt

1 watt = 1,000 milliwatts

From

Format

Conversion table

Selected W values converted to mW using the exact factor from this tool.

W	mW
0.01	10
0.1	100
1	1,000
2	2,000
3	3,000
5	5,000
10	10,000
20	20,000
50	50,000
100	100,000
1,000	1,000,000

How to convert

Exact conversion factors in both directions, plus a worked example.

1 W = 1000 mW

1 mW = 0.001 W

To convert watt to milliwatt, multiply by 1000.

To convert milliwatt to watt, multiply by 0.001.

Example: convert 10 W to mW

10 × 1000 = 10000 mW

About these units

Short background on the units used in this conversion.

Watt (W)

The watt is the SI unit of power — one joule of energy transferred per second.

Watts rate light bulbs, appliance nameplates, solar panels, and electrical device consumption.

Milliwatt (mW)

A milliwatt is one thousandth of a watt — a scale for low-power electronics and optical signals.

Milliwatts describe laser pointers, radio transmitters, and microcontroller power draw.

Frequently asked questions

How many milliwatts are in one watt?

One watt equals 1,000 milliwatts. Multiply your watts value by 1,000 to convert to milliwatts.

What is the conversion formula?

mW = W × 1,000

The reverse is W = mW × 0.001, using the same exact factors as this converter.

Is this Watt to Milliwatt converter private?

Yes. All calculations run locally in your browser. Nothing you type is sent to a server.

All watt conversions

Jump to any power conversion starting from watt — including the reverse direction and every other unit in our dataset.

milliwatt (mW) → watt (W)

watt (W) → kilowatt (kW)watt (W) → megawatt (MW)watt (W) → gigawatt (GW)watt (W) → horsepower (mechanical / uk) (hp)watt (W) → horsepower (metric) (metric hp)watt (W) → horsepower (electric) (hp (electric))watt (W) → british thermal unit (it) per hour (Btu/h)watt (W) → ton (refrigeration) (TR)watt (W) → exawatt (EW)watt (W) → petawatt (PW)watt (W) → terawatt (TW)watt (W) → hectowatt (hW)watt (W) → dekawatt (daW)watt (W) → deciwatt (dW)watt (W) → centiwatt (cW)watt (W) → microwatt (µW)watt (W) → nanowatt (nW)watt (W) → picowatt (pW)watt (W) → femtowatt (fW)watt (W) → attowatt (aW)watt (W) → horsepower (550 ft·lbf/s) (hp)watt (W) → horsepower (boiler) (hp (boiler))watt (W) → horsepower (water) (hp (water))watt (W) → pferdestärke (ps) (PS)watt (W) → british thermal unit (it) per minute (Btu/min)watt (W) → british thermal unit (it) per second (Btu/s)watt (W) → british thermal unit (thermochemical) per hour (Btu (th)/h)watt (W) → british thermal unit (thermochemical) per minute (Btu (th)/min)watt (W) → british thermal unit (thermochemical) per second (Btu (th)/s)watt (W) → mega british thermal unit (it) per hour (MBtu/h)watt (W) → mbh (thousand btu per hour)watt (W) → kilocalorie (it) per hour (kcal/h)watt (W) → kilocalorie (it) per minute (kcal/min)watt (W) → kilocalorie (it) per second (kcal/s)watt (W) → kilocalorie (thermochemical) per hour (kcal (th)/h)watt (W) → kilocalorie (thermochemical) per minute (kcal (th)/min)watt (W) → kilocalorie (thermochemical) per second (kcal (th)/s)watt (W) → calorie (it) per hour (cal/h)watt (W) → calorie (it) per minute (cal/min)watt (W) → calorie (it) per second (cal/s)watt (W) → calorie (thermochemical) per hour (cal (th)/h)watt (W) → calorie (thermochemical) per minute (cal (th)/min)watt (W) → calorie (thermochemical) per second (cal (th)/s)watt (W) → foot pound-force per hour (ft·lbf/h)watt (W) → foot pound-force per minute (ft·lbf/min)watt (W) → foot pound-force per second (ft·lbf/s)watt (W) → pound-foot per hour (lbf·ft/h)watt (W) → pound-foot per minute (lbf·ft/min)watt (W) → pound-foot per second (lbf·ft/s)watt (W) → erg per second (erg/s)watt (W) → kilovolt ampere (kV·A)watt (W) → volt ampere (V·A)watt (W) → newton meter per second (N·m/s)watt (W) → joule per second (J/s)watt (W) → exajoule per second (EJ/s)watt (W) → petajoule per second (PJ/s)watt (W) → terajoule per second (TJ/s)watt (W) → gigajoule per second (GJ/s)watt (W) → megajoule per second (MJ/s)watt (W) → kilojoule per second (kJ/s)watt (W) → hectojoule per second (hJ/s)watt (W) → dekajoule per second (daJ/s)watt (W) → decijoule per second (dJ/s)watt (W) → centijoule per second (cJ/s)watt (W) → millijoule per second (mJ/s)watt (W) → microjoule per second (µJ/s)watt (W) → nanojoule per second (nJ/s)watt (W) → picojoule per second (pJ/s)watt (W) → femtojoule per second (fJ/s)watt (W) → attojoule per second (aJ/s)watt (W) → joule per hour (J/h)watt (W) → joule per minute (J/min)watt (W) → kilojoule per hour (kJ/h)watt (W) → kilojoule per minute (kJ/min)