70-Hour / 8-Day Recap Logbook Calculator
Track Hours of Service (HOS) rolling recap for commercial motor vehicle drivers under FMCSA 70-hour / 8-day rules.
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Common Searches & Natural Queries
What is the 70-Hr / 8-Day Recap?
Property-carrying commercial interstate drivers operating every day of the week are bound by the FMCSA 70-hour / 8-day rule. A driver may not drive after being on duty 70 hours in any rolling 8 consecutive days. At midnight, Day 1 drops off the rolling window and its hours are regained.
Mathematical Formula & Methodology
The mathematical model underlying this tool operates on the following verified equation:
Total 8-Day Hours = Sum(Hours Days 1 through 8); Hours Available Tomorrow = 70 - (Total 8-Day Hours - Day 1 Hours Dropping Off)
Understanding the Parameters:
- Day 1 (Oldest, Dropping Off Tomorrow) (measured in hrs) — Primary input variable.
- Day 2 Hours (measured in hrs) — Primary input variable.
- Day 3 Hours (measured in hrs) — Primary input variable.
- Day 4 Hours (measured in hrs) — Primary input variable.
- Day 5 Hours (measured in hrs) — Primary input variable.
- Day 6 Hours (measured in hrs) — Primary input variable.
- Day 7 Hours (measured in hrs) — Primary input variable.
- Day 8 (Today) (measured in hrs) — Primary input variable.
How to Use This Calculator
Enter on-duty (driving + on-duty not driving) hours logged over the last 8 consecutive days. The calculator tallies your current 8-day on-duty total and indicates how many hours you gain back at midnight.
Worked Numerical Example
Days 1 through 8 log hours: 8.5, 9.0, 8.0, 10.0, 7.5, 8.5, 9.5, 6.0. Total 8-day on-duty = 67.0 hours (3.0 hours left today). At midnight, Day 1 (8.5 hrs) rolls off. Available tomorrow = 70 - (67.0 - 8.5) = 70 - 58.5 = 11.5 hours.
Key Considerations & Standards
A driver may reset their 70-hour clock to zero at any time by taking at least 34 consecutive hours completely off duty (the 34-hour restart).
Frequently Asked Questions
What is the 34-hour restart?
Taking 34 consecutive hours off-duty or in the sleeper berth resets the rolling cumulative on-duty clock to zero, giving the driver a fresh 70 hours.
Can you drive on Day 9 if you have hours left?
Yes, provided your rolling 8-day total does not exceed 70 hours at any point while operating the commercial vehicle.