Calculate the free space path loss (FSPL) for a given frequency and distance, and then determine the resulting RSSI based on transmit power and additional gains/losses.

Frequency
Distance
Transmit Power (dBm)
{{ advanced ? 'Hide' : 'Show' }} Advanced Options
Advanced Gains & Losses (dB)
Results

FSPL (dB): {{ fspl.toFixed(2) }} dB

RSSI (dBm): {{ rssi.toFixed(2) }} dBm

The Free Space Pathloss (FSPL) & RSSI Calculator is a tool designed for RF engineers, wireless network planners, and hobbyists working with wireless links. It computes the free space path loss given frequency and distance, and then calculates the resulting RSSI based on transmit power, antenna gains, and additional losses.

Key Features:

FSPL Formula:

For distance (d) in km and frequency (f) in MHz:

FSPL(dB) = 20*log10(d) + 20*log10(f) + 32.45

For frequency in GHz or distance in miles, internal conversions are performed first.

RSSI Calculation:

RSSI(dBm) = TxPower(dBm) + TxGain(dBi) + RxGain(dBi) - FSPL(dB) - AdditionalLosses(dB)
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