This paper presents the harmonic analysis of various pulse width modulation strategies used for the DC-AC converters. An efficient harmonics computation algorithm for piecewise continuous periodic waveforms has been derived. Fourier coefficients of experimentally obtained waveforms or simulation results can be calculated efficiently. Harmonic performance analysis of natural sampling, modified subharmonic control, symmetric/asymmetric uniform, sinusoidal pulse width modulation, and pulse position modulation strategies have been studied. Results can be used as guidelines for the modulation strategies selection in the PWM inverter design.