Free Signal-to-Noise Ratio Calculator
Calculate the signal-to-noise ratio (S/N) for analytical measurements to assess data quality and detection capability.
Signal-to-Noise Ratio (S/N)
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Signal-to-Noise Ratio (S/N) vs Signal Height (S)
Signal-to-Noise Ratio in Analytical Chemistry
The signal-to-noise ratio quantifies the quality of an analytical measurement. Higher S/N means the signal is more reliably distinguishable from background noise.
Formula
S/N = Signal Height / Noise Level
Noise is typically measured as peak-to-peak variation in a blank region. S/N of 3 is the detection limit criterion; S/N of 10 is the quantitation limit criterion.
Example Calculation
A chromatographic peak has a height of 100 units and baseline noise of 5 units peak-to-peak.
- 01S/N = 100 / 5 = 20
- 02S/N (dB) = 20 × log10(20) = 20 × 1.301 = 26.0 dB
- 03Well above quantitation limit (S/N = 10)
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