This calculator estimates the Signal-to-Noise Ratio (SNR) in decibels (dB), based on the ratio of signal power (or voltage) to noise power (or voltage).

The formula used depends on the input type:

• Power-based: \( \text{SNR}_{\text{dB}} = 10 \log_{10} \left( \frac{P_{\text{signal}}}{P_{\text{noise}}} \right) \)
• Voltage-based: \( \text{SNR}_{\text{dB}} = 20 \log_{10} \left( \frac{V_{\text{signal}}}{V_{\text{noise}}} \right) \)

SNR is a measure of how much stronger the signal is compared to background noise. Higher SNR means better signal quality:

• 0–10 dB: weak and noisy
• 10–20 dB: usable with effort
• 20–30 dB: good quality
• 30+ dB: excellent