THD (Total Harmonic Distortion) Calculator

Calculate total harmonic distortion for audio and power systems.

Signal Amplitudes (Vrms)

Fundamental (V1)

Main frequency amplitude

Harmonics

2nd Harmonic (V2)

3rd Harmonic (V3)

4th Harmonic (V4)

5th Harmonic (V5)

Distortion Analysis

THD1.1402%-38.86 dB

Signal QualityAudible Dist

Overview

THD measures signal distortion from harmonics. Lower THD = cleaner signal. Essential for audio equipment and power quality analysis.

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Pro Tips

Audio: <1% THD inaudible typically.
High-end audio: <0.1% THD.
Power: <5% THD acceptable.
THD+N includes noise measurement.

Fun Facts

"Human ear: <1% THD typically inaudible."
"Tube amps: higher THD but 'warm' sound."
"Class D amps: <0.05% THD typical."
"Power THD affects equipment efficiency."

Formula: THD = √(V2² + V3² + ... + Vn²) / V1 × 100%

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