How the 60/70-hour rule and the recap work
The 60- and 70-hour limits are the long game of hours-of-service. The 11-hour and 14-hour clocks govern a single shift; the 60/70-hour limit governs your whole week and beyond. Get it wrong and you can be perfectly legal for today's drive and still be shut down because your rolling total ran out. This calculator does the running arithmetic for you and, just as important, shows you the hours coming back so you can plan the days ahead instead of guessing.
Which limit is yours: 60/7 or 70/8
There are two versions of the rule, and which one applies to you depends on your carrier, not on you. Under 49 CFR 395.3(b)(1), if your carrier does not operate commercial motor vehicles every day of the week, you are held to 60 hours on duty in any period of 7 consecutive days. Under 395.3(b)(2), if your carrier operates every day of the week, you are held to 70 hours in any period of 8 consecutive days. Most over-the-road drivers run the 70/8 rule. Pick the one your carrier assigns you, and if you are not sure, ask; the two produce different numbers.
It counts on-duty time, not just driving
A common and expensive mistake is to track only driving hours against the 60/70 limit. The limit counts all on-duty time: driving, yes, but also loading and unloading, fueling, pre-trip and post-trip inspections, waiting that you have logged as on duty, and paperwork. Enter your total on-duty hours for each day so the rolling total matches what your ELD is counting, not a driving-only figure that will leave you short.
The rolling window and the recap
The key word in the rule is rolling. The limit always looks back over the last 7 or 8 days, so the window moves forward with you. Each time the clock passes midnight, the day that is now 8 days old (or 7, on the 60/7 rule) falls out of the window, and whatever on-duty hours you logged that day become available again. Drivers call the nightly tally of what comes back the recap. If you worked 10 hours eight days ago, then at tonight's midnight you get those 10 hours back, on top of whatever you have left now. The table above projects this forward day by day, assuming you keep your on-duty time low, so you can see when your hours recover.
The 34-hour restart, and when it beats the recap
Sometimes you do not want to wait for the recap to trickle your hours back. 49 CFR 395.3(c) lets a 7- or 8-day period end with the start of an off-duty period of 34 or more consecutive hours. Take that restart and your rolling total begins again at zero: you walk away with the full 60 or 70 hours available. The cost is real, though, 34 straight hours off duty, which is more than a day and a half. The restart wins when you are deep into your hours and want a clean week; the recap wins when you only need a few hours back and cannot spare 34. The comparison above shows exactly how many hours a restart would hand you right now, so you can weigh it against the wait.
A plan, not a logbook
As with every tool here, this is a planning aid, not a compliance record. It does not know your real logs, your carrier's settings, or any exception that might apply to you, and it assumes the hours you type are accurate. Your Electronic Logging Device is the authoritative record of your duty status. Use this to plan your week with confidence, then confirm every number against your ELD before you drive.