Free Total Harmonic Distortion Calculator. Step-by-step, engineering-grade tool with downloadable report.
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About this calculator
The total harmonic distortion calculator computes the Total Harmonic Distortion (THD) of a signal in audio and electric power systems and outputs a graph of the actual distorted waveform.
What is THD?
Total harmonic distortion (THD) quantifies the deviation of a signal's harmonic content from a pure signal by comparing the voltages of the signal's harmonic components to the voltage of the signal's fundamental frequency.
Why is it important to calculate THD?
THD is critical in assessing the purity of audio and electrical power signals, where a lower THD suggests a signal that closely resembles the original sound or intended electrical frequency, leading to improved audio reproduction and power system performance.
Typically, the THD value can be interpreted as:
- THD < 1%, indicates minimal distortion, ideal for high-fidelity audio and critical power systems.
- THD 1% to 5%, acceptable in many consumer audio and some industrial power applications, with possible noticeable distortion in high-quality settings.
- THD > 5%, considered poor, with likely perceptible distortion affecting audio quality and causing inefficiencies in sensitive power systems.
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