Hours of Service Calculator
Estimate driving time left, the 14-hour window, your next 30-minute break and cycle hours under 49 CFR 395.3.
Today's duty segments
| Status | Hours | |
|---|---|---|
This is an estimate for property-carrying drivers. Your ELD record is the legal source for your hours of service. Exceptions such as the sleeper berth split, adverse driving conditions and the short-haul exemption are not included.
The rules this calculator checks
| Rule (49 CFR 395.3) | What it means |
|---|---|
| 11-hour driving limit | You may drive up to 11 hours after 10 consecutive hours off duty. |
| 14-hour window | You may not drive after the 14th hour after coming on duty. Off-duty time does not extend it. |
| 30-minute break | You need a 30-minute break from driving after 8 cumulative hours of driving. On-duty not driving or off-duty time both count. |
| 60/70-hour cycle | No driving after 60 on-duty hours in 7 days, or 70 hours in 8 days. |
| 34-hour restart | 34 or more consecutive hours off duty resets the 60/70-hour cycle to zero. |
Worked example
Start 06:00 on the 70-hour cycle with 45 hours used: 1 hour on duty, 5 hours driving, a 30-minute break, then 3 hours driving. You have driven 8 hours, so 3 hours of driving are left. The 14-hour window closes at 20:00, with 4h 30m left. The break reset the 8-hour clock, so the next break is due after 5 more hours of driving. Cycle hours left: 70 - (45 + 9) = 16 hours.
Rules, prices and device details on this page were checked October 2026 against the official sources listed at the bottom. Where a provider doesn't publish a number, we say so instead of guessing.
Your ELD already counts your hours, but sometimes you want to plan ahead. Can you make the receiver before your 14 runs out? Will a 34 hour restart this weekend give you enough hours for Monday's run? This calculator helps you work through those questions using the federal property carrier rules in 49 CFR 395.3.
Use the HOS Calculator
Enter the time you came on duty, then add each part of your day as driving, on duty not driving, off duty or sleeper berth. Pick your cycle, either 60 hours in 7 days or 70 hours in 8 days, and enter your on duty totals for the previous days. The calculator shows:
- How much of your 11 hours of driving is left
- How much time is left in your 14 hour window
- Whether your 30 minute break is due
- How many hours are left in your 60 or 70 hour cycle
- When you'd be reset after 10 hours off or a 34 hour restart
A quick but important note: this is a planning tool. Your ELD is the legal record, and if the two ever disagree, go with the ELD and talk to your safety department. The calculator doesn't handle split sleeper berth, adverse driving conditions, short haul exemptions or passenger carrier rules. For those, see our guides to sleeper berth rules and ELD exemptions.
11 Hour, 14 Hour and 70 Hour Rules Explained
Here are the property carrier limits from 49 CFR 395.3, checked October 2026. They're the rules the calculator applies.
The 14 hour window
Once you come on duty after 10 straight hours off, a 14 hour clock starts. You can't drive after the 14th hour. Breaks don't stop this clock. If you come on at 6:00 a.m., you're done driving at 8:00 p.m. no matter how long you sat at the dock. You can still do on duty work after that, you just can't drive.
The 11 hour driving limit
Inside that 14 hour window, you can drive a total of 11 hours. Then you need 10 consecutive hours off duty before you drive again.
The 30 minute break
You need a break of at least 30 consecutive minutes once you've driven a total of 8 hours without one. The break can be off duty, sleeper berth or on duty not driving. It's tied to driving time, not to the clock, so 8 hours of driving with a two hour dock wait in the middle still adds up to 8.
The 60 and 70 hour limits
You can't drive after being on duty 60 hours in any 7 consecutive days, or 70 hours in any 8 consecutive days if your carrier runs every day of the week. All on duty time counts here, not just driving. It's a rolling total, so the oldest day drops off as each new day starts.
The 34 hour restart
Taking 34 or more consecutive hours off duty resets your 7 or 8 day total to zero.
Example Scenarios
A long dock wait
Maria comes on duty at 5:00 a.m. She does her pre trip, drives 3 hours, then waits 4 hours at a shipper while she's loaded. It's now noon. She has driven 3 hours, so she has 8 hours of driving left. But her 14 hour window ends at 7:00 p.m., which leaves only 7 hours of clock time. Her real limit is 7 hours. What about the break? The 4 hour wait counts, because it was at least 30 minutes without driving, so her 8 hour driving count starts over after it. With only 7 hours of driving possible before her window closes, she won't need another break today.
Running out of cycle
Dave is on a 70 hour, 8 day cycle. Over the last 7 days he's logged 64 on duty hours. Today he only has 6 hours available before he hits 70, even though his 11 and 14 hour clocks are fresh. If tomorrow the oldest day in his 8 day window drops a 10 hour day, he'll get those hours back. Or he can take a 34 hour restart and start clean.
Planning a restart
Ana finishes Friday at 6:00 p.m. A 34 hour restart means she can come back on duty at 4:00 a.m. Sunday with a full 70 hours available. The calculator shows the reset time so she can plan her Sunday departure.
Common HOS Violations
Most HOS trouble at roadside comes from a short list of mistakes. Watch for these:
- Driving past the 14th hour. Drivers often forget that waiting time burns the clock. Check your window before you accept a late appointment.
- Missing the 30 minute break. It's easy to roll past 8 hours on a good day. Set an alert in your ELD if it has one.
- Cycle overruns. On a busy week, drivers watch the daily clocks and forget the 60 or 70 hour total.
- Wrong duty status. Logging on duty work as off duty, or using personal conveyance for business moves, shows up fast in an audit.
- Uncertified logs. Drivers have to certify each day's record. Leaving days uncertified is a common finding.
For the full rules, including exceptions, see our hours of service guide. If you're still on a device that doesn't warn you before a violation, it might be time to compare ELD quotes.
Frequently Asked Questions
How do I calculate how many hours I have left to drive?
Take the smallest of three numbers: 11 minus the hours you have driven since your last 10 hours off, the time left until the 14th hour after you came on duty, and the hours left in your 60 or 70 hour cycle. Also check whether your 30 minute break is due.
Does a break stop the 14 hour clock?
No. Under 49 CFR 395.3 the 14 hour window keeps running during breaks. The only way to pause it is a qualifying split sleeper berth period, which this calculator does not cover.
Does on duty time count toward the 70 hour limit?
Yes. All on duty time counts toward the 60 or 70 hour limit, including loading, fueling and inspections, not just driving.
Can I trust this calculator over my ELD?
No. Use it for planning only. Your ELD record is what an inspector reviews, so if the numbers differ, follow your ELD and ask your carrier.
Sources
All prices, terms and registration details were checked October 2026 on the pages below. Providers change pricing often, so confirm before you buy.