dBm ↔ Watts ↔ Volts Converter
Power level conversions for RF work — dBm to watts to RMS/peak-to-peak volts at any system impedance.
Handy anchors: +3 dB doubles power, +10 dB is 10×, and 13 dBm = 20 mW (typical WiFi), 30 dBm = 1 W, 60 dBm = 1 kW. The voltage figures assume a matched sine into the stated impedance. Never feed more than the rated dBm into instrument inputs; +30 dBm kills most analyzers.
dBm to Watts Converter computes power levels between dBm, watts and volts at a given impedance — free, instant and private in your browser. RF techs, SDR users and lab engineers protecting instrument inputs use it to skip the datasheet algebra: type your numbers, read the answer with the substituted formula shown step by step, and share an exact permalink of the calculation.
About dBm ↔ Watts ↔ Volts Converter
dBm to Watts Converter computes power levels between dBm, watts and volts at a given impedance using the standard engineering relation: P(mW) = 10^(dBm/10); V(rms) = √(P·Z). Worked live: 30 dBm = 1 W = 7.07 V rms into 50 Ω; WiFi's 20 dBm is 100 mW. The result recalculates on every keystroke, the worked-example panel shows your numbers substituted into the formula, and the Copy permalink button encodes the inputs in the URL so a colleague opens exactly your calculation. Everything runs client-side — nothing you type leaves your device.
How to use dBm ↔ Watts ↔ Volts Converter
- 1Enter your values — the tool starts with realistic defaults for this exact use case, so the worked example is meaningful immediately.
- 2Read the live result and the worked-example panel, which substitutes your numbers into the formula step by step.
- 3Adjust any input to compare scenarios, then use Copy result or Copy permalink to share the calculation.
Why use dBm ↔ Watts ↔ Volts Converter?
- ✓Implements the real formula — P(mW) = 10^(dBm/10) — with the substitution shown, not a black box
- ✓Built for RF techs, SDR users and lab engineers protecting instrument inputs
- ✓Copy result and permalink buttons — share the exact calculation in a README, forum answer or design review
- ✓100% free, no sign-up, runs entirely in your browser (works offline once loaded)
Frequently asked questions
How do you calculate dbm to watts?+
Power levels between dBm, watts and volts at a given impedance follows P(mW) = 10^(dBm/10); V(rms) = √(P·Z). For example, 30 dBm = 1 W = 7.07 V rms into 50 Ω; WiFi's 20 dBm is 100 mW. The calculator applies the same relation and shows the substituted arithmetic so you can verify every step.
What dBm levels are dangerous to equipment?+
Most spectrum analyzers and SDR front-ends spec +10 to +20 dBm absolute max — a 5 W handheld (37 dBm) keyed near them induces damage even without a direct connection. Attenuators are cheaper than mixers; when in doubt, start with 30 dB inline.
Why do RF people use dBm instead of watts?+
Link math becomes addition: +30 dBm TX, −110 dB path, +12 dB antennas = −68 dBm received — try that in watts. The log scale also spans the absurd range of RF gracefully, from −174 dBm/Hz thermal noise to 80 dBm broadcast transmitters.
Is the dBm to Watts Converter free and private?+
Yes — completely free with no sign-up or usage limits, and it runs entirely in your browser: the values you enter are never uploaded or stored on a server.
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