Enter the total hours worked and the break time into the calculator to determine the hours of service.

Hours Of Service Calculator

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Hours of Service Formula

The following formula is used to calculate the hours of service for a given total hours worked and break time.

H_s = H_t - B

Variables:

  • ( H_s ) is the hours of service
  • ( H_t ) is the total hours worked
  • ( B ) is the break time in hours

To calculate the hours of service, subtract the break time from the total hours worked.

What is Hours of Service?

Hours of Service (HOS) regulations are designed to prevent accidents caused by driver fatigue. These regulations specify the maximum number of hours a driver can work and drive, as well as the minimum amount of rest they must take. The goal is to ensure that drivers are well-rested and alert, thereby improving road safety. HOS regulations are particularly important in industries such as trucking and transportation, where long hours on the road are common.

How to Calculate Hours of Service?

The following steps outline how to calculate the Hours of Service.


  1. First, determine the total hours worked (( H_t )).
  2. Next, determine the break time (( B )).
  3. Finally, calculate the hours of service using the formula ( H_s = H_t - B ).
  4. After inserting the values 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.

Total hours worked (( H_t )) = 10 hours

Break time (( B )) = 1 hour