RF power is usually specified in dBm on datasheets and spec sheets, but it's often easier to reason about actual transmit power in Watts. This calculator converts between dBm, milliwatts (mW), and Watts instantly — enter a value in any field and the other two update automatically.
dBm is a logarithmic unit referenced to 1 milliwatt: 0 dBm = 1 mW. Every 3 dB roughly doubles (or halves) the power, and every 10 dB is a factor of 10. The conversion uses the standard formula: P(dBm) = 10 · log₁₀(P(mW))
dBm ⇄ Watts Calculator
Enter a value in any one field and the other two update automatically.
Uses: P(dBm) = 10·log10(P(mW)).
Watts and mW must be greater than zero.
| dBm | mW | W |
|---|---|---|
| 0 | 1 | 0.001 |
| 10 | 10 | 0.01 |
| 20 | 100 | 0.1 |
| 30 | 1,000 | 1 |
| 40 | 10,000 | 10 |
| 50 | 100,000 | 100 |
| 60 | 1,000,000 | 1,000 |