Hours of Service Calculator
All four clocks from today's duty events.
Open34-Hour Restart Calculator
A restart costs 34 hours of parking and returns the weekly clock. The recap returns hours every morning for nothing. This prices both against the same shutdown so the choice is arithmetic rather than habit.
When the week comes back
Pre-filled with a Friday-evening shutdown. The comparison at the bottom is the one that decides whether the restart is worth taking.
- Daily clocks reset at
- 2026-09-05 04:20
- Restart completes at
- 2026-09-06 04:20
- That is a
- Sunday
Hours available tomorrow
70.0
After the 34-hour restart
17.5
On the recap, no restart
The restart buys 52.5 extra hours. Worth it only if you can sell them before the next weekly ceiling arrives.
What it checks
Two additions and one comparison. 10 hours from your off-duty minute is when the driving clock and the window come back; 34 hours from the same minute is when the weekly clock does. The panel underneath puts the restart's result beside the recap's so you can see the real difference, which on a well-run week is often under three hours.
Worked example
Off duty 18:20 Friday, 70-hour carrier, 64 hours used, and Monday of last week's 11.5 hours about to drop off.
| Choice | Back on the road | Hours available | Verdict |
|---|---|---|---|
| Take the restart | Sun 04:20 | 70.0 | Full week |
| Run the recap | Sat 04:20 | 17.5 | Two days of work |
The restart wins here, and by a lot — 70 against 17.5 — because the driver had run the week hard. Start the same Friday at 48 hours used and the gap closes to single figures, which is rarely worth a whole extra day parked.
The rule it comes from
49 CFR §395.3(c) — a 7-day or 8-day period may end with the beginning of an off-duty period of 34 or more consecutive hours. Nothing else.
The two conditions people still quote — that a restart must include two periods from 01:00 to 05:00, and that it may be used only once in 168 hours — were suspended and then removed. They are not in the section this calculator implements. Check the text yourself if a dispatcher insists otherwise; the link is in the sources below.
Sources
- 49 CFR §395.3read 2026-09-04