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.


RF Calculator

Calculate wavelength for a known frequency (Free Space)
MHz
λ (m)

Calculate VSWR from Forward and Reverse Power
Forward Power (W)
Reverse Power (W)
VSWR
Forward Power (dBm)
Reverse Power (dBm)
VSWR

Calculate radiated magnetic field from a loop antenna (Low frequency, Close proximity)
Loop Antenna Diameter (m)
Loop Antenna Windings (N)
Current into Loop Antenna (A)
Distance from Loop Antenna (m)
dBuA/m
pT
dBpT
Tesla
Guass
A/m

Calculate Power Density & Field Level (Far Field)
Power into Antenna (W)
Antenna Gain (dBi)
Distance from Antenna (m)
W/m^2
dBuV/m
V/m
A/m
V^2/m^2
A^2/m^2
mW/cm^2

Calculate Power to Generate a Known Field (Far Field)
Required Field (V/m)
Antenna Gain (dBi)
Distance from Antenna (m)
W

Calculate Circular Waveguide Attenuation
Frequency (MHz)
Diameter (mm)
Length (mm)
dB

Calculate Gain from Antenna Factor (50 Ω system)
Antenna Factor (dB/m)
Frequency (MHz)
dBi

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/cm^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
dBmV

Convert dBuV to dBm (50 Ω system)
dBuV
dBm



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