TheCircuitDogDigital & Timing
PWM Duty Cycle Calculator
Find PWM duty cycle and switching frequency from the pulse on-time and total period.
Enter the values above and select Calculate result.
Formula
Duty (%) = Ton / Tperiod × 100; f = 1 / Tperiod
Worked example
A 250 µs on-time in a 1000 µs period is 25% duty cycle at 1 kHz.
Engineering notes
Does not account for driver dead time, propagation delays or switching edges.
Always compare calculated values with the actual component datasheet, tolerance stack-up, operating temperature and circuit conditions before applying them to hardware.