THD Calculator

Calculate Total Harmonic Distortion from sine wave measurements

Measurement Type

Enter RMS voltages of fundamental and harmonic components

Number of Harmonics

Harmonic Values

Total Harmonic Distortion

Enter values to calculate...

RMS Method: Standard THD calculation using voltage amplitudes.

dBc Method: THD calculation using power ratios ( power of harmonics are measured relative to the carrier.)

For more information on THD and its calculation methods, check out my blogpost "Measuring THD of a Sine Wave"

Calculations are based on video from the ham radio enthusiast Alan Wolke (W2AEW). Check out his video "#305: Measuring Total Harmonic Distortion THD using an FFT on an oscilloscope"

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