RF Unit Converter: dBm, dBW, Watts, Volts

Your details

Choose the unit you are starting from. Voltage-based units require you to set the system impedance below.
The power (or voltage) level you want to convert.
Standard RF systems use 50 ohm. Cable TV and video use 75 ohm. Needed only when converting between power and voltage units.
dBmHigh (module transmit power)
10

Power in decibels relative to 1 milliwatt

dBW-20
Watts (W)0.01
Milliwatts (mW)10
Microwatts (uW)10,000
Voltage RMS (V)0.707107
Voltage peak (V)1
Voltage peak-to-peak (V)2
dBuV (rms)116.99
Impedance used50ohm
10 dBm
Noise floor<-100Very weak RX-100--60Receive range-60--20Low TX-20-10Module TX10-30Base station30-46High power46+

10.00 dBm

  • 10.00 mW: characteristic of low-power module transmitters (Bluetooth, Zigbee, Wi-Fi).
  • Remember: +3 dBm doubles power, +10 dBm multiplies by 10. So 10.0 dBm is 13.0 dBm at half the power.
  • Across 50 ohm, this equals 707.107 mV RMS.
  • dBW = dBm - 30: 10.00 dBm = -20.00 dBW.

Next stepTo compute link budget, add transmit power (dBm), antenna gain (dBi), and subtract free-space path loss (dB) to get received signal level.

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