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Signal-to-Noise Ratio Calculator

Calculate SNR, link quality, and expected WiFi performance

The signal level as reported by the client or AP (RSSI). Typical range: -30 dBm (excellent) to -90 dBm (unusable). Measured in dBm.
dBm
Background noise level. In clean environments typically -95 to -90 dBm. In noisy RF environments -85 to -80 dBm. Higher noise = worse SNR.
dBm

SNR Results

Signal-to-Noise RatiodB
Link Quality%
Quality Rating
Expected Max MCS Index (HT/VHT)
Expected Link Speed (1SS, 80MHz, ac)Mbps
Suitable For
Quality Bar
References: SNR = Signal(dBm) - Noise(dBm). MCS index mapping based on IEEE 802.11ac/ax minimum SNR requirements per MCS level. Quality percentage is approximate.