How do I use this calculator?
Choose completion time, latest start time, or time remaining. Enter date-times in the device time zone.
Calculator Operations:
- Choose Reset completion time and enter when the consecutive off-duty period began.
- Choose Latest reset start time and enter the desired completion date and time.
- Choose Time remaining and enter the off-duty start and the date-time to check.
The calculator adds or subtracts 34 elapsed hours, including daylight-saving changes. A remaining-time result is fixed at the entered check time. This timing tool does not establish legal driving eligibility.
Use the calculate button when all known values have been entered and use the reset button when you want to clear the values from the calculator.
Calculate when a 34-hour FMCSA restart for property-carrying drivers ends, find the latest reset start time, or check remaining consecutive off-duty time.
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34-Hour Reset Clock Formula
The following formula is used to calculate the time remaining on a 34-Hour Reset Clock.
Variables:
- TR is the time remaining on the 34-Hour Reset Clock (hours)
- H is the whole consecutive off-duty hours elapsed (hours)
- M is the additional consecutive off-duty minutes elapsed (minutes)
To calculate the time remaining on the 34-Hour Reset Clock, add the whole consecutive off-duty hours elapsed to the additional consecutive off-duty minutes elapsed divided by 60 (to convert minutes to hours). Subtract this sum from 34 (the total hours in the reset period), with a minimum remaining time of zero. These are elapsed off-duty hours, not work hours.
What is a 34-Hour Reset Clock?
A 34-hour reset clock is a provision in the hours of service regulations for truck drivers in the United States for property-carrying drivers. It allows those drivers to reset their 60 or 70-hour clock, which tracks the maximum amount of time they are allowed to work in a 7 or 8-day period, by taking 34 consecutive hours off-duty. This rule is designed to prevent driver fatigue and improve road safety.
How to Calculate 34-Hour Reset Clock?
The following steps outline how to calculate the time remaining on the 34-Hour Reset Clock.
- First, determine the whole consecutive off-duty hours elapsed (H).
- Next, determine the additional consecutive off-duty minutes elapsed (M).
- Next, gather the formula from above = TR = \max(0, 34 - (H + M/60)).
- Finally, calculate the time remaining on the 34-Hour Reset Clock (TR).
- 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.
Consecutive off-duty hours elapsed (H) = 12
Additional consecutive off-duty minutes elapsed (M) = 30. The time remaining is 34 − 12.5 = 21.5 hours (21 hours 30 minutes).
