How to Calculate a Duty Cycle

The duty cycle of a machine can be calculated using a very simple formula and a calculator.

1. Use the timer to determine the length of time the machine is switched on. Take a note of this value. For example, a refrigerator pump may be on for approximately 30 minutes.

2. Time the period in which the machine is switched off. Take a note of this value. Following the example, a refrigerator pump may be off for approximately 10 minutes.

3. Calculate the duty cycle using the following formula:

4. Duty Cycle = 100 * (Time on ) / (Time on + Time off)

5. Following the example leads to a duty cycle of:

6. Duty Cycle = (30 minutes) / (30 + 10 minutes) = 30/40 = 75 %

Things You Will Need
• Timer
• Calculator
Show More