Unit Converters · Browser · Free

dBm to mW Conversion

Enter a power in dBm and press Convert to get the same power in milliwatts. Results are rounded to 15 significant digits, so each one is shown with ≈.

What this tool does

This tool converts dBm to mW. There is one number field, so a single value is all you fill in.

The form computes only when Convert is pressed, and the result appears in a card below the button.

Reading and keeping the result

Because the result comes from a power, it is rounded to 15 significant digits and shown with ≈.

Copy writes the result and its unit to the clipboard. Clear resets the form. Everything runs in the browser and nothing is uploaded.

dBm to mW formula

P(mW) = 10^(P(dBm) / 10), where P(dBm) is the power in dBm and P(mW) is that power in milliwatts.

The table below shows shortened values, among them 0 dBm as 1 mW, 3 dBm as 1.995262315 mW and 20 dBm as 100 mW.