Estimate a single played note from the frequency and dB level of spectrum peaks. A loud overtone can be higher than the note you played.

Enter one peak per line, separated by a comma, space, or tab. Negative dB values are normal. Include quieter peaks as well as the loudest ones. Up to 64 peaks.
Range and tuning settings

Instrument presets change the search range: bass 25–500 Hz, guitar 55–1,600 Hz. Adjust for extended ranges or alternate tunings. A semitone is 100 cents.

Try a synthetic example:

Getting useful peaks from Audacity

Select the steady part of one isolated note. Open Analyze → Plot Spectrum, choose Spectrum, and use a larger Size for finer frequency resolution—particularly for low bass notes. Enter the frequencies and dB levels of the peaks, rather than every frequency bin in an exported spectrum. Audacity Plot Spectrum guide

The calculator looks for up to 32 harmonics, using relative dB levels to weight the evidence. Both instruments use the same pitch mapping; their harmonics can have different strengths. This is an estimate for one note, not a chord detector. Missing harmonics, hum, distortion, or imprecise peaks can make the octave or note ambiguous. Notes use sounding pitch and scientific octaves (middle C is C4). Guitar acoustics