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dBm ↔ Watts Converter

dBm · dBW · Watts · mW · µW · dBµV · dB Math

When to use: The everyday RF engineer's reference tool. Convert between dBm, dBW, watts, milliwatts, and microwatts, and perform dB addition and subtraction (combining gains and losses on a signal path). Tap any common level in the reference table to instantly load it. Remember: dB values add and subtract; power values multiply and divide.

Power Level Input

dBm

Common Signal Levels

Conversions

dBm30.00 dBm

dBW0.00 dBW

Watts1.000 W

milliwatts1000 mW

microwatts1.000e+6 µW

dBµV (50Ω)137.0 dBµV

dB Addition / Subtraction

0 + 0 dB (add gain/loss)0.00 dB

0 − 0 dB (subtract loss)0.00 dB

Key Conversions

0 dBm = 1 mW · 10 dBm = 10 mW · 20 dBm = 100 mW

30 dBm = 1 W · 40 dBm = 10 W · 50 dBm = 100 W

dBm = 10·log10(P_mW) = 10·log10(P_W) + 30

+3 dB ≈ 2× power · +10 dB = 10× power