RF Calculator: Wavelength, dBm, dBuV, W, dBuV/m, mW/cm^2, pJ/cm^2, V & VSWR

This RF calculator has been developed by Compliance Engineering as a resource for individuals involved in EMC and RF compliance measurements.

The following table provides conversions for wavelength (from frequency), VSWR (from forward and reflected power) and various other useful conversions.

Calculate Wavelength (Free Space) MHz
 λ (m)
Calculate VSWR from Forward and Reverse Power Forward Power (W)
Reverse Power (W)
Forward Power (dBm)
Reverse Power (dBm)
Calculate Power Density & Field Level (Far Field) Power into Antenna (W) W/m^2
Antenna Gain (dBi)
Distance from Antenna (m)
dBuV/m
 V/m
 A/m
 V^2/m^2
 A^2/m^2
 mW/cm^2
Calculate Power to Generate a Field (Far Field) Required Field (V/m) W
Antenna Gain (dBi)
Distance from Antenna (m)
Calculate Circular Waveguide Attenuation Frequency (MHz) dB
Diameter (mm)
Length (mm)
Calculate Gain from Antenna Factor (50 Ω system) Antenna Factor (dB/m) dBi
Frequency (MHz)
Convert mW/cm^2 to pJ/cm^2 (Free Space) mW/m^2
 pJ/cm^2
Convert pJ/cm^2 to mW/cm^2 (Free Space) pJ/cm^2
 mW/m^2
Convert dBm to W (50 Ω system) dBm
 W
Convert W to dBm (50 Ω system) W
 dBm
Convert dBm to V (50 Ω system) dBm
 V
Convert V to dBm (50 Ω system) V
 dBm
Convert dBm to dBuV (50 Ω system) dBm
 dBuV
Convert dBuV to dBm (50 Ω system) dBuV
 dBm

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