dBm / mW Converter
Convert power between dBm, mW, W and dBW by entering a single value, and compute the received power and the link margin by subtracting losses from the transmit power. Everything in your browser.
The power in all units
| Unit | Value | Definition |
|---|
Received power and link margin
Losses = cables + connectors + splices + FSPL or fiber attenuation
(all in dB). Prx = Tx + gains − losses;
Margin = Prx − Sensitivity.
How it is calculated · dBm, mW and margin
1. dBm is power on a logarithmic
scale referenced to 1 mW:
mW = 10^(dBm/10) and dBm = 10·log₁₀(mW).
2. Equivalences: W = mW / 1000,
µW = mW × 1000 and dBW = dBm − 30.
So 0 dBm = 1 mW and 30 dBm = 1 W.
3. Received power:
Prx (dBm) = Tx + gains − losses. In dB you add and
subtract directly (no multiplying), because the scale is already logarithmic.
4. Margin:
Margin = Prx − Sensitivity. If the margin is
positive the link works; if it is
negative the signal falls below the receiver threshold.
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