THD Distortion Calculator (Total Harmonic Distortion)

This is a Total Harmonic Distortion (THD) Calculator tool that can be used alongside your Oscilloscope FFT or spectrum analyzer to find out the total harmonic distortion of your signal.

Level your signal so that the fundamental (1st-order) harmonic is at 0dB, then take the amplitude reading (in dB) of as many harmonics as you want up to the 9th-order harmonic.

Fundamental Harmonic Amplitude (dB): 2nd Order Harmonic Amplitude (dB): 3rd Order Harmonic Amplitude (dB): 4th Order Harmonic Amplitude (dB): 5th Order Harmonic Amplitude (dB): 6th Order Harmonic Amplitude (dB): 7th Order Harmonic Amplitude (dB): 8th Order Harmonic Amplitude (dB): 9th Order Harmonic Amplitude (dB): Decimal Places for THD:

THD (%): 0.00%

THD (dB): 0.00 dB

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