# Watts to dBm free online conversion

## Watts to dBm conversion calculator

Watts (W) to decibel-milliwatts (dBm), power conversion calculator.

Enter the power in watts and press the Convert button:

W
dBm

dBm to Watts Conversion »

## How to convert watts to dBm

The power P(dBm) in dBm is equal to 10 times the base 10 logarithm of 1000 times the power P(W) in watts (W) divided by 1 watt (W):

P(dBm) = 10 ⋅ log10( 1000 ⋅ P(W) / 1W) = 10 ⋅ log10( P(W) / 1W) + 30

so

1W = 30dBm

#### Example

Convert 20 watts to dBm:

P(dBm) = 10 ⋅ log10(1000⋅20W) = 43.0103dBm

## Watt to dBm conversion table

Power (mW) Power (dBm)
0 W not defined
0+ W -∞ dBm
01 W -20 dBm
0.0001 W -10 dBm
0.001 W 0 dBm
0.01 W 10 dBm
0.1 W 20 dBm
1 W 30 dBm
10 W 40 dBm
100 W 50 dBm
1000 W 60 dBm
10000 W 70 dBm
100000 W 80 dBm
1000000 W 90 dBm

dBm to Watts Conversion »

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