Watt to Milliwatt Converter (and vice versa)
Created by: tinycalcs.com/en
Number of supported units: 2
Last update: 2026
This converter allows you to convert watts [W] to milliwatts [mW] or milliwatts [mW] to watts [W]. Calculations are performed in both directions. The calculation result and the entered value are displayed with up to 20 decimal places for maximum accuracy.
Convert watts to milliwatts
There are two simple ways to convert watts [W] to milliwatts [mW]. In the first calculation method, the value in watts [W] is divided by 0.001. The second method multiplies the value in watts [W] by 1,000.
- Milliwatts [mW] = watts [W] ÷ 0.001
- Milliwatts [mW] = watts [W] * 1,000
Convert milliwatts to watts
Converting milliwatts [mW] to watts [W] is easy and can be done in two ways. The first method involves multiplication, whereby the value in milliwatts [mW] is multiplied by 0.001. The second variant is a division. Here, the value in milliwatts [mW] is divided by 1,000.
- Watts [W] = milliwatts [mW] * 0.001
- Watts [W] = milliwatts [mW] ÷ 1,000
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