Milliwatts to Watts and Watts to Milliwatts: How Many Milliwatts Are In A Watt?

Milliwatts (mW) and watts (W) are directly related units of power and it is very easy to convert milliwatts to watts and watts to milliwatts.

In order to convert milliwatts to watts and watts to milliwatts, feel free to use our conversion chart, conversion calculator, but also, learn the relationship between these units.

Just be aware that the "milli (m)" is one of the official unit prefixes in the International System (SI) of Units and means one-thousandth (1/1000 = 1/10³ = 10^-3) - so one milliwatt (mW) is one-thousandth of one watt (W).

milliwatts to watts 1

On This Page:

Conversion Formulas
Conversion Examples
Conversion Calculator
Conversion Charts

Conversion Formulas

Both milliwatts (mW) and watts (W) are units of power, with the following relation between them:

1 watt (W) = 1000 milliwatts (mW)

1 milliwatt (mW) = 1/1000 watt = 0.001 watt (W)

Again, "milli (m)" is one of the official unit prefixes in the International System (SI) of Units and means one-thousandth (1/1000 = 1/10³ = 10^-3) - one milliwatt is one-thousandth of a watt.

Thus, in order to convert the power given in milliwatts into the power given in watts and vice versa, be sure to remember the following formulas:

P_watts = P_milliwatts/ 1000

P_milliwatts = P_watts* 1000

Milliwatts to Watts and Watts to Milliwatts Conversion Examples

Using conversion formulas, it is fairly easy to convert milliwatts to watts and watts to milliwatts:

500 milliwatts to watts:

P_(W) = 500 milliwatts / 1000 = 0.5 W

3.675 watts to milliwatts:

P_(mW) = 3.675 watts * 1000 = 3675 mW

Milliwatts are very small amounts of power measured with very accurate apparatuses, for example, power of the button/coin watch batteries and similar. For example:

SR626SW is a very popular silver-oxide battery with a nominal voltage of 1.55V, a typical capacity of 25 mAh, and a typical current of 50μA.

In order to calculate the power of such a battery, we use the following formula:

P(W) = U(V) * I(A) = 0.0000775 W = 0.0775 mW = 77.5 μW

So, when converting milliwatts to watts and watts to milliwatts, just be sure to multiply and divide by 1000 and that is all.

Also, when converting microwatts to milliwatts and milliwatts to microwatts, just be sure to multiply and divide by 1000 - the simplicity of SI Unit prefixes.

Milliwatts to Watts and Watts to Milliwatts Conversion Calculator

In order to convert milliwatts to watts and watts to milliwatts, feel free to use this conversion calculator - write the value that You have and click 'Calculate' to convert it: