### 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

Try our other EMC related calculator pages:

**Radiated Power Calculator:**Convert between radiated RF power units including: ERP, EIRP, dBuV/m, dBm & mW**Field Strength Calculator:**Convert between various radiated RF field units including: V/m, dBuV/m, dBuA/m, pT, dBpT, Tesla, Guass, A/m, mW/cm^2 & W/m^2