Signal to Noise Ratio Calculator
Enter the known values and run the calculation.
Enter the signal level and the noise level, then run the calculation.
The result reports the signal-to-noise ratio in decibels using the power-ratio form of the logarithmic relationship.
Overview
Calculate SNR to compare signal strength to background noise in linear or dB terms.
Use this tool to convert a linear signal-to-noise ratio into decibels.
Use it for quick signal-quality comparisons when you already know the relative signal and noise levels and want the ratio in dB.
The math and how it's used
This implementation treats the entered values as power-like magnitudes or quantities already proportional to power.
If you are working from amplitude terms instead, convert accordingly before interpreting the dB result.
Use this when you already know the relative signal and noise levels and want the result in the dB form people actually use in reviews and specifications.
This implementation uses the power-ratio form. If your inputs are amplitude-like rather than power-like, be careful about the physical meaning before quoting the answer.
What to watch
Be consistent about what the entered values represent. This implementation uses the 10 log10 form, so the inputs should be power-like terms or values already proportional to power.
If the measurement context is amplitude-based, the physical interpretation changes and the result should be converted with care.