Enter the two rest periods you took. The calculator shows how each one measures against the sleeper berth provision, and where your driving window restarts.
When did you come on duty?
First rest period
Second rest period
How each period measures up
Your day, drawn out
Resulting windows
Assumptions used
Important — read before relying on this result
This calculator is an unofficial planning aid and is not a substitute for your ELD, your carrier policies, or current FMCSA requirements. Verify your schedule and the applicable rules before relying on the result.
How this sleeper berth calculator works
The hours-of-service rules normally require 10 consecutive hours off duty before you can drive again. The sleeper berth provision is the exception: it lets you take that 10 hours as two separate periods instead of one unbroken block — which is what makes a long day workable when a shipper keeps you waiting or traffic eats your window.
This calculator takes the two rest periods you actually took, measures each one against the minimums, adds them together, and shows you where the 14-hour driving window falls as a result. It draws the day out as a timeline so you can see the shape of it rather than reading a number in isolation.
It reports measured hours, time windows and the assumptions behind them. It does not tell you whether you are compliant. That depends on your full record of duty status, your ELD and your carrier’s policies — none of which a web page can see.
The long period
At least 7 consecutive hours, and it has to be spent in the sleeper berth. Off-duty time in a hotel or at home does not satisfy this half.
The short period
At least 2 consecutive hours, off duty or in the berth, or a combination of the two. This half is far more flexible.
The pair total
The two periods added together must reach at least 10 hours. Meeting both minimums separately is not enough on its own.
What you get back
When the pair qualifies, neither period counts against the 14-hour driving window — and the window is recalculated from the end of the first qualifying period.
The rule, stated plainly
Three conditions have to hold at the same time. Miss any one and the split does not qualify under the general rule:
One period of 7+ consecutive hours in the sleeper berth
This is the restrictive half. The time must be in the berth and it must be unbroken — a berth period interrupted by on-duty time does not count as consecutive.
Another period of 2+ consecutive hours
Off duty, in the sleeper berth, or a mix. Also unbroken. Order does not matter; either period can come first.
The two together must total 10+ hours
A 7-hour berth period paired with a 2-hour break totals 9 and does not qualify, even though both minimums are individually met.
combined rest = period A + period B
qualifying pair = one period ≥ 7h in the sleeper berth
+ one period ≥ 2h off duty or in the berth
+ combined ≥ 10h
Why 6+4 does not work
This is the single most common misunderstanding about the provision, and it is worth being precise about. A 6-hour berth period paired with a 4-hour off-duty period totals exactly 10 hours — so it looks like it should qualify. It does not, because neither period reaches 7 consecutive hours in the sleeper berth.
The 10-hour total is necessary but not sufficient. One of the two periods has to carry the 7-hour berth requirement on its own.
FMCSA currently runs a Flexible Sleeper Berth pilot programme that adds 6/4 and 5/5 split options — but only for drivers enrolled in it. It is not the general rule, and this calculator deliberately does not apply it. If you are enrolled, your programme terms govern, not this page.
Worked example
You come on duty at 6:00 AM and drive five hours to your first stop. You take seven hours in the sleeper berth while the trailer is unloaded, drive another four hours, then take three hours off duty waiting for a live load.
| Segment | Length | Running clock |
|---|---|---|
| On duty, driving | 5h 00m | 6:00 AM → 11:00 AM |
| Sleeper berth | 7h 00m | 11:00 AM → 6:00 PM |
| Driving | 4h 00m | 6:00 PM → 10:00 PM |
| Off duty | 3h 00m | 10:00 PM → 1:00 AM |
The 7-hour berth period carries the long requirement and the 3-hour break clears the 2-hour minimum, so the pair totals 10 hours and qualifies. Because it qualifies, the 14-hour window is recalculated from 6:00 PM — the end of the first qualifying period — rather than running out at 8:00 PM from your original 6:00 AM start.
Why this matters in practice
The recalculated window is the entire point of the provision. Without it, that 6:00 AM start would have closed your driving window at 8:00 PM regardless of how much rest you took in between.
With a qualifying split, the clock restarts from the end of the first qualifying period — which is what turns a day that would otherwise strand you into one you can finish.
Mistakes that cost drivers a qualifying split
Using off-duty time for the long half
The 7-plus hour period must be in the sleeper berth. A night in a motel does not satisfy it, however long it was.
Breaking the berth period
Stepping out to move the truck or handle paperwork interrupts the consecutive requirement, and the period restarts from zero.
Counting to 10 and stopping there
Both minimums and the total have to be satisfied. 6+4 reaches 10 and still fails.
Forgetting the shorter half is flexible
Drivers often waste berth time on the short period when off-duty time would have counted just as well.
Assuming order matters
It does not. The berth period can be first or second — only the lengths and types matter.
Applying pilot rules you are not enrolled in
The 6/4 and 5/5 options exist only inside FMCSA pilot programmes. Outside them, the general rule applies.
How the sleeper berth provision fits the other limits
The provision changes how the 14-hour window is counted. It does not change anything else. All the other limits keep running underneath it:
| Limit | Value | Does the split change it? |
|---|---|---|
| Driving limit | 11 hours | No — 11 hours is 11 hours either way |
| Driving window | 14 hours | Yes — recalculated from the end of the first qualifying period |
| 30-minute break | After 8h driving | No — still required, though a qualifying rest satisfies it |
| Weekly cycle | 60h / 7 days or 70h / 8 days | No — on-duty hours accumulate regardless |
That last row catches people out on multi-day runs. A perfectly executed split does nothing for your cycle, and the cycle is often what actually stops you by day four or five.
What sleeper berth flexibility is actually for
The provision exists because a rigid 10-hour block does not match how freight actually moves. Detention at a shipper, a receiver that will not take you until morning, a construction closure that turns a four-hour run into seven — none of these care about your clock.
Being able to split rest lets you take the delay as rest rather than burning window on it. The trade-off is that both halves have to be planned deliberately. Splits rarely happen by accident; the drivers who get value from the provision are the ones who decide early in the day that they are going to use it.
Decide early
Work out whether you are splitting before the first rest, not after. Retro-fitting a split to rest you already took usually fails on the berth requirement.
Protect the 7
The long period is the fragile one. Park somewhere you will not be moved, and keep it unbroken.
Use off-duty for the short half
Save berth time for where it is required. The 2-hour period counts either way.
Log it as it happens
A split reconstructed from memory at the end of the day is where errors creep in. Your ELD is the record that matters.
Frequently asked questions
What counts as a qualifying sleeper berth period?
At least 7 consecutive hours spent in the sleeper berth. The paired period must be at least 2 consecutive hours off duty or in the berth, and the two together must reach at least 10 hours. All three conditions have to hold — meeting two of them is not a partial pass.
Does the order of the two periods matter?
No. Either period can come first. What matters is that one of them is at least 7 consecutive hours in the sleeper berth, the other is at least 2 consecutive hours, and the pair totals 10 or more.
Why does my 14-hour window move?
When a pair qualifies, neither period counts against the driving window. The window is recalculated from the end of the first qualifying period rather than running from when you originally came on duty. That recalculation is the entire benefit of the provision.
Can I use off-duty time instead of the sleeper berth?
Only for the shorter period. The 7-plus hour period has to be spent in the sleeper berth — a night off duty in a motel does not satisfy it, however long it was.
Why does 6 hours plus 4 hours not qualify?
Because neither period reaches 7 consecutive hours in the sleeper berth. The 10-hour total is necessary but not sufficient. FMCSA runs a pilot programme that adds 6/4 and 5/5 splits, but only for drivers enrolled in it.
What happens if my berth period gets interrupted?
The consecutive requirement breaks and the period effectively restarts. Stepping out to move the truck or handle paperwork partway through a 7-hour berth period means you no longer have a 7-hour berth period.
Does this tell me whether I am legal?
No, deliberately. It shows calculated hours, time windows and the assumptions used. Compliance depends on your complete record of duty status, your ELD and your carrier policies, none of which a web calculator can see.
Does a qualifying split help my weekly cycle?
No. The provision affects the 14-hour driving window only. On-duty hours accumulate against your 60 or 70 hour cycle regardless of how your rest was structured — which is often what actually stops you by day four or five.
Do passenger-carrying drivers use the same rule?
No. Passenger-carrying drivers operate under a different sleeper berth provision with different thresholds. This calculator covers property-carrying drivers.
Where do these rules come from?
They are summarised from the FMCSA Summary of Hours of Service Regulations and the FMCSA 2020 hours-of-service FAQ set. The source link and the date the rules were last verified appear directly beneath the calculator.
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