TLWS DOT Tools
HOS Calculator
11-hour drive clock · 14-hour window · 60/70 cycle · split sleeper berth pairing under 49 CFR §395.1(g). See what time your split gives back — and when.
Planning and education only. This tool is not an ELD, keeps no record of duty status, and does not replace your ELD, your carrier’s safety department, or the regulations. Verify every result on your ELD before driving. Property-carrying drivers, current federal rules only — state rules, passenger rules, adverse-conditions, and short-haul exceptions are not calculated. Don’t use this while driving — park first.
What are you checking?
The rules behind the math
Straight from the regulation
- 11-hour driving limit — up to 11 hours of driving after 10 consecutive hours off duty (49 CFR 395.3(a)(3)(i)).
- 14-hour window — no driving beyond the 14th consecutive hour after coming on duty. The window runs on the wall clock; ordinary breaks don’t pause it (49 CFR 395.3(a)(2)).
- 30-minute break — required after 8 cumulative hours of driving; any 30-minute non-driving period counts (49 CFR 395.3(a)(3)(ii)).
- 60/70-hour cycle — the rolling on-duty cap over 7 or 8 days; restored only by a 34-hour restart (49 CFR 395.3(b), (c)).
- Split sleeper berth — the 10 required off-duty hours may be split into one period of at least 7 consecutive hours in the sleeper berth plus a second period of at least 2 consecutive hours off duty or in the sleeper, totaling at least 10. Properly paired periods don’t count against the 14-hour window, and the clocks recalculate from the end of the first qualifying period (49 CFR 395.1(g)(1); FMCSA split sleeper FAQs). 6/4 and 5/5 are not authorized for ordinary property-carrying drivers.
Official sources: 49 CFR 395.3 (eCFR) · 49 CFR 395.1(g) (eCFR) · FMCSA: qualifying split rest periods · FMCSA HOS summary