The 34-hour restart calculator is a quick planning tool that takes the moment you go off duty, adds the 34 consecutive hours the restart requires, and tells you the exact date and time you would be clear to drive again with a fresh weekly cycle. Instead of guessing whether you have parked long enough, you get a precise clear time, plus a simple way to decide whether a restart is even the right move this week. For any property-carrying driver who lives under the 60-hour/7-day or 70-hour/8-day limit, that clarity is worth a lot.
The restart is one of the most useful and most misunderstood parts of the Hours of Service system. Used well, it hands you a full week of hours back in a single block and lets you run hard the following week. Used carelessly, it costs you a day and a half of productive time you did not need to give up, or worse, it comes up a few minutes short and does not count at all. The difference between those outcomes is almost always timing, and timing is exactly what this tool is built to nail down.
What the 34-hour restart calculator does and who it is for
The tool does two related jobs. First, it computes the finish. You tell it when your continuous off-duty period begins, and it returns the moment 34 hours later when your weekly cycle resets to zero and you are clear to drive. Second, it helps you plan. You can work backward from a delivery appointment to find the latest possible start time, or compare a restart against simply waiting for your daily recap to hand hours back.
The audience is anyone who manages a truck's clock. Company drivers use it to line up a reset with a weekend at home or a long wait for a load. Owner-operators use it to protect earnings by never parking longer than the rule requires. Dispatchers and fleet planners use it to confirm a driver will actually be legal for an assignment. Newer drivers and CDL students use it to build a gut feel for how the 34-hour restart interacts with the weekly cycle. If your schedule bends around Hours of Service, the 34-hour restart calculator earns its place on your phone.
What the 34-hour restart rule actually says
Here is the rule in plain language. A property-carrying commercial driver may reset the weekly on-duty cycle by taking at least 34 consecutive hours off duty. Those hours can be logged as off duty, as sleeper berth, or as any mix of the two. The single hard requirement is that the block is continuous. From the moment it starts until at least 34 hours have passed, you cannot go on duty, not for driving and not for on-duty not driving.
When that continuous 34-hour block is complete, your total on-duty hours for the 60-hour/7-day or 70-hour/8-day cycle go back to zero. You then begin a new cycle with the full 60 or 70 hours available, as if the previous week's on-duty tally had been wiped clean. The restart does not delete your logs or your daily records, and it does not change the daily driving limits themselves. What it changes is the weekly bucket, emptying it in one move.
One more point that trips people up: the restart is optional. Nothing forces you to take one. It sits alongside the daily recap as a second way to get hours back. Recap returns hours gradually as old days roll off your rolling window. A restart returns the whole cycle at once. You pick the tool that fits the week in front of you.
How the restart resets your cycle to zero
To see why a restart is powerful, remember how the weekly cycle normally behaves. Your on-duty total is measured across a rolling window, the current day plus the previous six days under 60/7, or the current day plus the previous seven under 70/8. That total only drops when a day ages out of the window and its hours recap, and it never hits zero on its own. If you have run hard, you can be pinned against your ceiling with only a trickle of recap coming.
The 34-hour restart cuts through that. Take the continuous 34 hours off duty and the rolling total is set to zero for the purpose of the cycle. You are not waiting for individual days to roll off anymore. You start the next stretch with a clean 60 or 70. That is the trade at the heart of the restart: you spend 34 continuous hours parked, and in exchange you get your entire weekly allowance back in one shot instead of a few hours at a time.
When a 34-hour restart makes sense, and when recap is smarter
A restart is not automatically the right call. Sometimes riding the recap keeps you far more productive. The deciding factor is how much your recap will return over the next day or two versus how much a restart returns right now.
Consider the shape of the days about to leave your window. If the oldest days were long, 12 or 13 hour shifts, then a big recap is arriving soon and waiting a short while gives you plenty of hours without parking for 34. In that case, take the recap. If the oldest days were light, 4 or 5 hours each, then the recap dribbles back slowly and it could take several days to accumulate a usable amount. That is when a restart shines, because it hands you the whole cycle immediately.
There is also a timing angle. A restart costs you 34 hours of driving time, but only if those hours would otherwise be productive. If you are already going to be stopped, for a weekend at home, a long detention at a shipper, or a 34-hour gap between a delivery and your next pickup, then a restart layered over that stop costs you almost nothing extra. The art is lining the reset up with time you were going to lose anyway. If you also want to track exactly how your recap hours build over the week, our companion tool, the HOS Recap Calculator, projects the recap day by day so you can compare it against a restart side by side.
The math of a restart: finding your clear time
The calculation itself is simple, which is the good news. Your clear time is exactly 34 hours after your continuous off-duty period begins. If you go off duty at 6:00 p.m. on Friday, add 34 hours and you are clear at 4:00 a.m. on Sunday. If you go off duty at midnight, you are clear at 10:00 a.m. the day after next.
The reason a dedicated 34-hour restart calculator helps is that adding 34 hours in your head crosses a full day plus ten hours, which is easy to get wrong when you are tired at the end of a run. Thirty-four hours is one full day, 24 hours, plus another 10. So the finish is always the same clock time plus ten hours, two calendar days later, unless the ten-hour part pushes you past midnight, in which case the date shifts again. The tool handles that arithmetic and the date rollover so you do not shut down thinking you will be legal at 2 a.m. when the true clear time is 4 a.m.
A related planning move is working backward. If you must be rolling by 5:00 a.m. Monday for a delivery, subtract 34 hours to find the latest you can start the restart, which is 7:00 p.m. Saturday. Start any later and you will not have completed a valid restart in time. The calculator does this reverse math too, so you can find the last safe moment to park.
How to use the ToolFiddle 34-hour restart calculator step by step
The flow takes well under a minute.
- Step one, enter your off-duty start. Put in the date and time you begin your continuous off-duty block, the moment you go off duty or into the sleeper for the reset.
- Step two, read your clear time. The 34-hour restart calculator adds 34 hours and shows the exact date and time your restart completes and your weekly cycle resets to zero. That is the earliest you may drive again on a fresh cycle.
- Step three, work backward if you need to. If you have a fixed appointment, switch the direction, enter the moment you must be rolling, and let the tool show the latest start time that still finishes the restart before you go.
- Step four, sanity-check against your plan. Line the clear time up with your load schedule. If the reset finishes at 4 a.m. and your pickup is at 8 a.m., you have margin. If it finishes at 8:15 a.m. for an 8 a.m. pickup, you need to start the restart earlier.
- Step five, confirm against your ELD before you drive. The tool is for planning. Your electronic logging device and your logs are the record that counts, so verify the restart is complete there before you go on duty.
The timeline under the clear time shows the whole block at a glance, with a tick every two hours, heavier marks at the 10 and 24 hour points, and a moving Now pin while the block is running. Nothing you enter is sent anywhere.
Worked examples you can follow
Example one, a 70/8 driver timing a home reset. You run the 70-hour/8-day cycle and you have been hard all week. Your rolling total sits at 66 of 70 hours, and the days about to roll off are light, so recap will only give back a few hours over the next couple of days. You are heading home for the weekend anyway, so a restart is the obvious move.
You deliver your last load and go off duty Friday at 5:30 p.m. Enter that into the 34-hour restart calculator. Add 34 hours: 24 hours brings you to 5:30 p.m. Saturday, and another 10 hours brings you to 3:30 a.m. Sunday. So your restart completes at 3:30 a.m. Sunday, and from that moment your cycle is back to a full 70 hours. Your first Sunday load can be scheduled for any time at or after 3:30 a.m. You spent the weekend at home, the reset cost you no productive driving time, and you start the new week with the entire cycle available.
Example two, a 60/7 driver deciding restart versus recap. Your window total is 57 of 60 hours. The oldest day in your window was a 12-hour shift, which means tomorrow morning 12 hours recap onto your balance without you parking at all. Here a restart would be a mistake. Why give up 34 hours to reset when a simple overnight break brings 12 hours back and lets you keep rolling?
Change the facts. Suppose instead the oldest days were 3, 4, and 5 hour shifts. Now the recap over the next three days totals only 12 hours spread thin, and you are stuck near the ceiling the whole time. A 34-hour restart returns the full 60 at once. You check the 34-hour restart calculator, see that going off duty at 7:00 p.m. clears you at 5:00 a.m. two mornings later, and decide the reset is worth it because your recap was too weak to keep you productive. Same driver, opposite decision, and the numbers made the call.
Real-world ways drivers use the restart
The most common use is the weekend reset. Drivers heading home time their last delivery so the 34 hours fall across the days they would be home anyway, then use the tool to confirm exactly when they are clear for Monday.
A second use is the reset on the road. When home is not an option, a driver caught near the ceiling parks at a truck stop and uses the calculator to know the precise clear time, so the shutdown is 34 hours and not a minute more than necessary.
A third use is appointment planning. Dispatch has a Monday morning pickup, and the planner works backward with the tool to tell the driver the latest they can start their restart and still be legal for the load. No back-and-forth, just a clean answer.
A fourth use is the restart-versus-recap decision, ideally paired with a recap projection. Seeing the restart clear time next to the recap schedule makes the trade obvious, so drivers stop taking restarts they do not need and stop skipping ones they do.
A fifth use is teaching. Safety trainers and new drivers use the tool to demonstrate how a 34-hour block lands on the clock, which makes the abstract rule concrete.
Tips and common mistakes
- Do not short the block. A restart that runs 33 hours and 50 minutes does not count, full stop. If you go back on duty even a little early, you have not completed a valid restart and your cycle is not reset. Always give yourself margin past the 34-hour mark, and let the calculator show you the true finish so you are not cutting it close.
- Do not break continuity. Any on-duty time during the block resets the 34-hour clock. Pre-tripping the truck, moving it on duty, doing paperwork on the clock, all of these interrupt the restart and force you to start the 34 hours over. Off-duty activities like sleeping, eating, and resting are fine because they keep you off duty.
- Do not restart when recap would have served better. If a big day is about to roll off your window, waiting a few hours for that recap can save you the entire 34-hour shutdown. Do not reset out of habit; reset when the math says it beats recap.
- Do not ignore the time zone. Log and calculate using your home terminal's time zone consistently, so a restart that crosses zones on the road still lines up with your records.
- Do not treat the tool as the rule. The 34-hour restart calculator is a planning aid. Your ELD and your official logs are what enforcement checks, and the current federal and state regulations are what govern you. Plan with the tool, then confirm on your device.
A deeper look: history of the restart and how the block works
The 34-hour restart has a history worth knowing, because search results are still full of outdated details. A rule that took effect in 2013 added two extra conditions to the restart: it could be used only once every 168 hours, roughly once a week, and it had to include two overnight periods running from 1 a.m. to 5 a.m. Those conditions were controversial, and Congress suspended them. As the rule currently stands, the restart carries neither of those extra requirements. A driver may take a restart as needed, and it does not have to include specific overnight hours.
Because rules can and do change, treat that history as context, not gospel. Always verify the current regulations before you rely on them. What has stayed constant is the core: 34 consecutive hours off duty, off duty or sleeper berth or a mix, with no on-duty time in the middle.
On the makeup of the block, remember that the 34 hours are about duty status, not location or activity. You can sleep, eat, run errands, watch a game, or do nothing at all. You can be at home, at a rest area, or at a terminal. The clock does not care, as long as you are off duty or in the sleeper the whole time. Combining sleeper berth and off-duty time is completely normal during a restart and does not weaken it.
It is also worth separating the restart from the daily clocks. Your 11-hour driving limit and your 14-hour on-duty window reset after any 10 consecutive hours off duty. A 34-hour restart obviously includes far more than 10 hours off, so it resets those daily clocks as a matter of course. The restart's unique power, the thing a plain 10-hour break cannot do, is zeroing the weekly 60 or 70 hour cycle.
Restart and recap: two tools, one goal
It helps to hold both ideas together. Recap and the restart both give you hours back, but they work differently. Recap is automatic and gradual, handing you hours one day at a time as your rolling window advances, and it never zeroes your total. The restart is deliberate and total, setting the weekly cycle to zero after 34 continuous off-duty hours.
The smart driver uses both. Most weeks, recap alone keeps you rolling, especially when your heavy days are the ones aging off the window. When recap runs thin, or when you are going to be stopped anyway, the restart steps in to hand back the whole cycle. Knowing when to switch between them is the difference between a driver who runs full legal weeks and one who leaves hours on the table. Pairing this tool with the HOS Recap Calculator gives you both sides of that picture at once.
Important disclaimer: a planning aid, not legal advice
Read this carefully. The 34-hour restart calculator is a planning aid only. It is not legal advice, it is not compliance advice, and it is not an official record of your duty status. It computes elapsed time and helps you think ahead. It cannot account for every exception, split-sleeper pattern, adverse-driving situation, short-haul provision, or state-specific rule that might apply to you.
Your electronic logging device and your official logs are the records that matter, and they are what you must follow. Hours of Service rules are set by the Federal Motor Carrier Safety Administration and can change over time, and some states impose their own requirements for intrastate driving. Always verify your restart and your cycle status against your ELD and the current federal and state regulations, and consult your carrier's safety department whenever you are unsure. Use this tool to plan and to double-check, never as a substitute for your device, your logs, or professional guidance. Staying compliant is your responsibility.
Built for privacy: your schedule stays on your device
The times you enter are your business, and the tool is designed around that. The 34-hour restart calculator runs entirely in your browser. When you type an off-duty start time, the math happens on your own phone, tablet, or laptop. Nothing is sent to a server, nothing is tied to an account, and nothing is stored once you close the page. Your schedule never leaves your hand because the tool never receives it. You can plan a reset and walk away with no data trail left behind.
Genuinely free: no sign-up, no account, no paywall
Plenty of trucking apps make you register, hand over an email, or pay a monthly fee before they will add 34 hours to a time for you. This one does not. The 34-hour restart calculator is free to use with no sign-up, no account, no email capture, and no locked premium tier. Every feature is open to everyone, every time, at no cost. You already pay for fuel, tires, insurance, and permits. A restart clear time should not come with a subscription.
Instant and unlimited: no waiting, no limits, a light page
Because the calculation runs on your device, the answer appears the instant you enter a time. There is no server round trip, no daily usage cap, and no queue. Check one restart or test a dozen what-if start times back to back; it is free every time and never slows down. The page is intentionally light and clear of heavy ad scripts, so it loads fast even on a weak signal at a rest area far from a tower. Fast answers, as many as you want, whenever you need them.
Works on any device, even offline
This tool is meant for the cab, not just the desk. It runs on a phone, a tablet, or a laptop, and the layout fits whatever screen you have. Since the math happens locally, once the page has loaded you do not need a live connection to use it. That is exactly what you want when you are parked in a dead zone deciding when your reset ends. Load the 34-hour restart calculator while you have signal, and it keeps working when the bars disappear. No app to install, no updates to chase, just a web page that adds the hours wherever you are.
Related tools on ToolFiddle
A few other ToolFiddle tools pair well with this one. The HOS Recap Calculator tracks your rolling 60/7 or 70/8 hours and projects the recap, so you can compare it against a restart. The Days Between Dates Calculator measures the exact gap between two dates when you are planning a week out, and it doubles as a quick hours and time card check. The Time Zone Converter keeps you straight when an appointment is quoted in a different zone from your home terminal. The Countdown Timer runs a live clock down to the moment you are clear to roll, and the Stopwatch times a wait at the dock. Every one of them does its work on your device, exactly like this one.
A quick recap
The 34-hour restart calculator turns a simple but error-prone piece of trucking math into a precise answer. Enter when you go off duty, and it shows the exact moment 34 consecutive hours later when your weekly cycle resets to zero and you are clear to drive again. A restart is optional and total, wiping the 60 or 70 hour cycle in one block, while recap is automatic and gradual. Take a restart when recap is thin or when you are already stopped, and ride the recap when a big day is about to roll off. Never short the 34-hour block, never break its continuity with on-duty time, and always confirm on your ELD. The tool is private, free, instant, and works on any device, even without a signal. Plan with it, then let your logs and the current rules decide.