RF Calculators

Convert a power level in dBm to a voltage level in dBµV across a known system impedance.

Convert a power level in dBm to the RMS voltage it produces across a given impedance.

Convert a power level in dBm to watts, milliwatts and dBW.

Convert a voltage level in dBµV to a power level in dBm across a known system impedance.

Convert between noise figure in dB and the linear noise factor F.

Convert a noise figure to the equivalent input noise temperature, and back again.

Convert any power level between watts, dBW and dBm in one step.

Turn an output/input power pair into a ratio and its decibel equivalent — gain when positive, loss when negative.

Convert an RMS voltage across a known impedance to a power level in dBm.

Convert a power in watts, milliwatts or kilowatts to dBm and dBW.

Turn a directional coupler's forward and reflected power readings into VSWR and return loss.

Work out the reflection coefficient from the load and characteristic impedance, with the resulting VSWR and return loss.

Convert a reflection coefficient magnitude into return loss in dB.

Convert a reflection coefficient magnitude into the equivalent VSWR.

Convert a return loss in dB into the reflection coefficient magnitude.

Convert a return loss in dB into the equivalent VSWR.

Convert between VSWR, reflection coefficient and return loss — enter whichever one you have.

Find how much of the forward power a given VSWR sends back to the amplifier, as a percentage and in watts.

Convert a VSWR figure into the magnitude of the reflection coefficient.

Convert a VSWR figure into the equivalent return loss in dB.

Friis cascade: add gain and noise figure stage by stage to get the total noise figure of a receive chain.

Find a receiver's noise floor — the smallest signal it can resolve — from its bandwidth and noise figure.

Work out an amplifier's power added efficiency from its RF input, RF output and DC supply power.

Calculate the SFDR of a receiver from its input third-order intercept point and minimum detectable signal.

Calculate the thermal noise floor of a system from its bandwidth and ambient temperature.

Calculate effective isotropic radiated power from transmit power, feed losses and antenna gain.

Calculate effective radiated power for a broadcast transmitter from its output power, antenna gain and system losses.

Calculate the loss between two antennas in free space from the distance, frequency and antenna gains.

Calculate the power received over a free-space link from transmit power, antenna gains, wavelength and separation.

Add up transmit power, antenna gains, feed losses, path loss and fade margin to get the received power.

Convert a frequency to its free-space wavelength, and a wavelength back to frequency.

TE10 cut-off frequency and the usable single-mode band from the waveguide's broad wall width.

Guide wavelength, free-space wavelength and cut-off for the TE10 mode of a rectangular waveguide.

Wavelength of a TEM-mode line — stripline, coax or free space — from frequency and relative permittivity.