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Watts to dBm conversion

Watts to dBm conversion

How to convert watts to dBm

Watts to dBm Converter

Watts to dBm Conversion Calculator

Enter the power in watts and press the Convert button:

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 (W)Power (dBm)
0 Wnot defined
0+ W-∞ dBm
0.00001 W-20 dBm
0.0001 W-10 dBm
0.001 W0 dBm
0.01 W10 dBm
0.1 W20 dBm
1 W30 dBm
10 W40 dBm
 100 W50 dBm
 1000 W60 dBm
 10000 W70 dBm
100000 W80 dBm
1000000 W90 dBm

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