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Watts to dBm conversion

  • Watts to dBm conversion calculator
  • How to convert watts to dBm
  • Watt to dBm conversion table
  • Enter the power in watts and press the Convert button:

    W
       
    dBm result: dBm

    dBm to watts conversion calculator ►

    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 ►