Enter the disk utilization (%) and the interval length (sec) into the Calculator. The calculator will evaluate the Disk Service Time. 

Disk Service Time Formula

DAT = U/100 * IL


  • DAT is the Disk Service Time (sec)
  • U is the disk utilization (%)
  • UL is the interval length (sec)

To calculate Disk Service Time, divide the disk utilization by 100, then multiply by the interval length.

How to Calculate Disk Service Time?

The following steps outline how to calculate the Disk Service Time.

  1. First, determine the disk utilization (%). 
  2. Next, determine the interval length (sec). 
  3. Next, gather the formula from above = DAT = U/100 * IL.
  4. Finally, calculate the Disk Service Time.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

disk utilization (%) = 78

interval length (sec) = 234