FMCSA hours of service clock calculator.

How it works

Under 49 CFR 395.3, a property-carrying driver may not drive without first taking 10 consecutive hours off duty, may not drive after the 14th consecutive hour after coming on duty, may drive a total of 11 hours in that period, may not drive once more than 8 hours of driving time have passed without at least a consecutive 30-minute interruption in driving status, and may not drive after 60 hours on duty in 7 consecutive days or 70 hours in 8 consecutive days. The tool subtracts what you have used from each limit and shows the smallest remainder. Worked example: 6 hours driven, 12 hours since coming on duty, 2 hours driven since the last break and 20 hours used on a 70-hour cycle leaves 5 hours of driving, 2 hours in the window, 6 hours to the break and 50 hours in the cycle, so 2 hours of driving remain and the 14-hour window stops you first.

What this does not decide

This is a planning aid, not an electronic log and not legal advice. It does not model short-haul or other exemptions, adverse driving conditions, the sleeper-berth provisions, personal conveyance, oilfield or agricultural rules, or the 34-hour restart in detail. A driver and carrier remain responsible for their own records. Canadian drivers follow different rules.

Sources (each retrieved 2026-10-16): 49 CFR 395.3 Maximum driving time for property-carrying vehicles (10 hours off duty, 14-hour period, 11 hours driving, 30-minute break after 8 hours of driving time, 60/70 hours in 7/8 days, 34-hour restart).

FAQ

What are the FMCSA hours of service rules for truck drivers?

Property-carrying drivers need 10 consecutive hours off duty, may drive up to 11 hours within a 14-hour window, need a 30-minute break after 8 hours of driving time, and are limited to 60 hours in 7 days or 70 hours in 8 days.

Does the 14-hour window stop when I take a break?

No. The 14-hour period runs from coming on duty after 10 consecutive hours off, so breaks inside it do not extend it, except where a split-sleeper or other provision applies, which this tool does not model.

What counts as the 30-minute break?

At least a consecutive 30-minute interruption in driving status after 8 hours of driving time. The regulation describes the interruption in driving status, not a specific log status.

When do the 60 or 70 hour limits reset?

A period of 34 or more consecutive hours off duty can end the 7- or 8-day period, which restarts the cycle.

Is this the same as my electronic logging device?

No. Your ELD and carrier records are the legal record. This tool gives a quick estimate from numbers you enter.