AC power quality
Harmonic Distortion Calculator
Calculate voltage or current total harmonic distortion and total RMS from measured fundamental and harmonic components.
Waveform distortion
Enter fundamental and harmonic RMS
V RMS
V RMS
V RMS
Voltage distortion estimate
4.86 % THD
Harmonic RMS5.83
Total RMS120.14
Measurement summary onlyUse components measured over the same interval and reference. Limits depend on the point of common coupling, equipment, and applicable standards; this value alone does not establish compliance.
About this calculator
Calculate voltage or current total harmonic distortion and total RMS from measured fundamental and harmonic components.
Method and assumptions
THD = root-sum-square of entered harmonic RMS components ÷ fundamental RMS × 100. Total RMS is the root-sum-square of the fundamental and entered harmonic components.
Components are assumed to be distinct frequency orders measured on the same basis. The result is not a compliance determination.