HOS Calculator: 11-Hour, 14-Hour, 30-Minute & Split Sleeper
Enter your duty status since your last 10-hour break to see how long you can still drive — including split-sleeper recalculation.
Not covered: passenger-carrying, short-haul exceptions, personal conveyance, team-driver passenger-seat time, Canadian and intrastate rules.
The end of your last 10 consecutive hours off duty or in the sleeper berth
Allows up to 2 extra hours for both driving and window limits (49 CFR 395.1(b))
Current Clocks
Updated live based on duty periods completed
Clocks counted from end of last break
End of your 10-hour consecutive break
Your 3:00 off-duty break can be the first half of a split. Take at least 7:00 in the sleeper berth next.
After it you will have: 8:00 driving and 11:00 window.
Planning aid for US property-carrying drivers under FMCSA rules. Your ELD record and the regulations are what count. Not legal advice.
Quick answer
After 10 consecutive hours off duty you may drive up to 11 hours, but not after the 14th hour since coming on duty, and not more than 8 hours of driving without a 30-minute break (49 CFR 395.3). With a split sleeper — one period of at least 7 hours in the sleeper berth and another of at least 2 hours, together at least 10 — your clocks are recalculated from the end of the first period, and neither period counts against the 14 hours.
How to use this calculator
- Enter when your last 10-hour break ended.
- Add each duty status since then, in order, with its length.
- Read "Can drive now" and the split panel.
- Copy the link to keep the plan.
Worked example (FMCSA Example 14)
| Time | Duty Status | Duration | HOS Significance |
|---|---|---|---|
| Day 1 00:00–10:00 | Off duty | 10h 00m | Qualifying 10-hour consecutive reset |
| Day 1 10:00–10:15 | On duty | 0h 15m | Comes on duty; 14-hour window starts |
| Day 1 10:15–14:15 | Driving | 4h 00m | 4 hours driving |
| Day 1 14:15–14:30 | Off duty | 0h 15m | 15-minute stop (does not qualify as 30-min break) |
| Day 1 14:30–19:00 | Driving | 4h 30m | 30-min break violation begins at 18:30 (8h driving) |
| Day 1 19:00–22:00 | Off duty | 3h 00m | First split period (3h off duty ≥ 2h) |
| Day 1 22:00–23:00 | On duty | 1h 00m | On duty |
| Day 1 23:00–24:00 | Driving | 1h 00m | Driving |
| Day 2 00:00–00:30 | On duty | 0h 30m | On duty |
| Day 2 00:30–02:00 | Driving | 1h 30m | Driving (legal retroactively once pair completed) |
| Day 2 02:00–09:00 | Sleeper berth | 7h 00m | Second split period (7h SB); pairs with 3h break |
| Day 2 09:00–09:30 | On duty | 0h 30m | Clocks recalculated from Day 1 22:00 |
| Day 2 09:30–17:30 | Driving | 8h 00m | Driving |
| Day 2 17:30–18:00 | On duty | 0h 30m | On duty (satisfies 30-min break) |
| Day 2 18:00–18:30 | Driving | 0h 30m | Driving |
| Day 2 18:30–21:30 | Off duty | 3h 00m | Third split period (3h off duty); pairs with 7h SB |
After the 7-hour sleeper period ends at 9:00 on day 2, the driver's clocks count from 22:00 on day 1 (end of the 3-hour break): 4 hours of the 14 used and 2.5 hours of driving, leaving 8.5 hours of driving within 10 hours. After the 3-hour break at 18:30–21:30 on day 2, the clocks count from 9:00: 9.5 of 14 used and 8.5 hours of driving, leaving 2.5 hours of driving within 4.5 hours. The only violation in the example is the 30-minute break rule from 18:30 to 19:00 on day 1 — a 15-minute stop does not count.
How it's calculated
1. Shift start (S0): The engine finds the end of the most recent consecutive rest block of 10 or more hours (600 minutes) off duty or in the sleeper berth.
2. Qualifying split blocks: Any rest period after S0 between 2 and 10 hours (120 to 599 minutes) is identified as a candidate split period.
3. Pair matching: Candidates are evaluated in chronological order. A pair is valid when both periods are at least 2 hours, at least one period has 7 or more hours in the sleeper berth, and both total at least 10 hours. When a pair completes, the calculation point restarts at the end of the earlier period, and the second period is excluded from the 14-hour window.
4. Clock usage: Driving used is the sum of driving minutes since the latest recalculation point. Window used is elapsed time minus the duration of the excluded split period.
5. 30-minute break: Drivers cannot drive after 8 cumulative hours of driving without a 30-consecutive-minute break of off-duty, sleeper-berth, or on-duty non-driving time.
6. Available driving time: The maximum time a driver can legally drive right now is the smallest of: 11-hour limit minus driving used, 14-hour window minus window used, and 8-hour break clock minus driving since break.
7. Split guidance: When a driver has an open split period, the system calculates the exact minimum duration and sleeper-berth requirement needed for the second period.
8. Projections: Future available clocks are simulated by appending the required rest period and re-running the engine.
Frequently Asked Questions (FAQ)
Does on-duty time count as a 30-minute break?
Yes. Since the 2020 rule change, 30 consecutive minutes of off-duty, sleeper-berth or on-duty (not driving) time, or a mix, satisfies the break (395.3(a)(3)(ii)).
Does a split sleeper stop my 14-hour clock?
Not while you're in it. When the second period of a valid pair ends, the 14 hours are recalculated from the end of the first period, and both periods are left out.
Why does the clock say I'm out of hours when I planned a split?
The live clock only counts breaks you have finished. The split panel tells you exactly what break completes the pair and what you'll have after it.
What is the adverse driving conditions exception?
If you meet snow, ice, fog or unusual road conditions you couldn't have known about, you may extend the 11-hour and 14-hour limits by up to 2 hours (395.1(b)).
Sources
- 49 CFR 395.3 — Maximum driving time for property-carrying vehicles (Cornell LII)
10/11/14 hours, 30-minute break, 60/70, 34-hour restart
- 49 CFR 395.1 — Scope of rules; (b) adverse conditions; (e) short-haul; (g) sleeper berths (Cornell LII)
Split-sleeper conditions, adverse +2 h, short-haul scope note
- 49 CFR 395.2 — Definitions (Cornell LII)
On-duty, driving time, 24-hour period, adverse conditions
- FMCSA — Summary of Hours of Service Regulations (updated 28 Mar 2022)
Official summary of hours of service regulations
- FMCSA — HOS Examples (PDF, 28 Apr 2022)
Example 14 test vector; Examples 6–8 (restart), 29 (70-hour)
- eCFR — 49 CFR Part 395 (official current text)
Official electronic Code of Federal Regulations text
Last reviewed: 2026-10-26
Built and maintained by Numberwright. The rules engine follows 49 CFR Part 395 and reproduces FMCSA's published Example 14. Found a mistake? Contact details coming soon.
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