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RF Interference Calculator

Calculate RF interference impact on WiFi throughput and quality

The received signal strength of the desired/wanted WiFi signal. Measured in dBm. Typical: -40 to -75 dBm.
dBm
The received signal strength of the interfering source at your receiver. Higher (less negative) = stronger interference.
dBm
Frequency offset between desired and interferer channels. 0 MHz = co-channel. 20 MHz = adjacent channel in 20 MHz mode. 25+ MHz = non-adjacent.
MHz
Co-channel: same frequency, must share airtime via CSMA/CA. Adjacent: partial overlap causing spectral leakage. Non-WiFi: microwave, Bluetooth, etc. that don't obey 802.11 protocol.
Background noise level excluding the interferer. Typically -95 to -90 dBm in clean environments.
dBm

Interference Analysis

Signal-to-Interference Ratio (SIR)dB
Signal-to-Noise Ratio (SNR, no interferer)dB
SINR (Signal-to-Interference+Noise)dB
Effective Interference RejectiondB
Estimated Throughput Degradation%
Severity

Recommended Mitigations

    References: SIR = Desired(dBm) - Interferer(dBm). SINR calculated by combining noise and interference power. Adjacent channel rejection per IEEE 802.11 spectral mask requirements (~25 dB for first adjacent, ~40 dB for second).