Link Budget Calculator

Calculate RF link budget with comprehensive transmitter, receiver, and path loss analysis.

Quick Scenarios

Select a preset to auto-populate parameters for common use cases.

Transmitter

Tx Power (dBm)Base station transmit power

Tx Antenna Gain (dBi)Transmitter antenna gain

Tx Cable Loss (dB)Feeder/cable losses at transmitter

Effective Isotropic Radiated Power

57.50dBm

Receiver

Rx Sensitivity (dBm)Minimum detectable signal (negative)

Rx Antenna Gain (dBi)Receiver antenna gain

Rx Cable Loss (dB)Cable losses at receiver

Effective Receiver Sensitivity

-105.00dBm

Path Loss & Losses

Path Loss Model

Path Loss (dB)Total path loss between Tx and Rx

Body loss (dB)

Penetration loss (dB)

Fade margin req (dB)

Visualizing the Link

A link budget accounts for all the gains and losses from the transmitter, through the medium (free space, cable, waveguide, fiber, etc.) to the receiver in a telecommunication system.

EIRPTx Power + Tx Gain - Tx Losses

Path LossSignal attenuation over distance

Fade MarginRx Power - Rx Sensitivity

Key Formula

P_RX = P_TX + G_TX - L_TX - L_fs - L_misc + G_RX - L_RX

P_RX: Received Power (dBm)

P_TX: Transmitter Output Power (dBm)

G_TX, G_RX: Antenna Gains (dBi)

L_TX, L_RX: Cable/Connector Losses (dB)

L_fs: Free Space Path Loss (dB)

L_misc: Miscellaneous Losses (Fade Margin, Body Loss, etc.) (dB)