A semi truck on an open highway at dusk, chrome catching amber light, the road running to the horizon

Free hours-of-service tools for truck drivers

Three focused clock tools and a plain-English guide to the federal rules. Free, no sign-up, and built to work on a phone in the cab.

Learn the rules

How the clocks fit together

Staying legal on the road means keeping several clocks straight at once, and the three tools here each take one of them off your plate. Together they cover the day, the week, and the load. None of them is your logbook; they are here to make the rules easy to see so you can plan with confidence and then confirm the details on your Electronic Logging Device and at the scale.

Start with the day. The split sleeper berth planner draws your 11-hour driving clock and your 14-hour window on a single timeline, and checks whether a 7/3 or 8/2 sleeper split is valid. It is the fastest way to see whether a plan actually gives you the driving time you think it does, because a valid split recalculates both clocks and the tool shows the hours coming back.

Then the week. The 70-hour/8-day recap calculator tracks your rolling 60 or 70-hour on-duty total, projects how many hours return at each midnight as old days roll off, and compares that gradual recap against a single 34-hour restart. It answers the question every driver asks on a long run: how many hours will I have tomorrow.

Finally the load. The axle weight and tandem slide calculator turns a scale ticket into how many holes to slide the trailer tandems and which direction, so an overweight axle becomes a specific move rather than a guess. As always, a certified scale is the authority, so you reweigh after every slide. Read the full hours-of-service guide for how the rules behind these tools actually work.

Frequently asked questions

What is hours of service?
Hours of service (HOS) is the set of federal rules in 49 CFR 395 that limit how long a commercial driver can drive and work. The core limits for property-carrying drivers are 11 hours of driving, a 14-hour driving window, a required 30-minute break, and a rolling 60-hour/7-day or 70-hour/8-day on-duty cap. The rules exist to reduce fatigue-related crashes.
Are these tools official or a substitute for my ELD?
No. Everything here is an advisory planning aid, not a compliance record. Your Electronic Logging Device and your carrier's records are the authoritative account of your hours, and a certified scale is the authority on your weights. Use these tools to understand the rules and plan ahead, then confirm against your ELD and the scale before you drive.
Which tool do I need?
Use the split sleeper berth planner to visualize your 11 and 14-hour clocks and check a 7/3 or 8/2 split. Use the 70-hour/8-day recap calculator to track your rolling on-duty total and see hours come back at midnight or after a 34-hour restart. Use the axle weight and tandem slide calculator to turn a scale ticket into how many holes to slide your tandems.
Do the tools cost anything or need a login?
No. Every tool is free, runs entirely in your browser, and needs no sign-up. They do not store your data on a server, because there is no server; the calculations happen on your device.
Where do the rules come from?
The hours-of-service limits come from Title 49 of the Code of Federal Regulations, Part 395, chiefly sections 395.3 and 395.1(g). The axle weight limits come from 23 CFR 658.17. The guide on this site cites those sections directly so you can read the source, but the rules can change and exceptions may apply to you, so treat the guide as a plain-English starting point.