HOS Hours Calculator
Calculate your remaining driving and on-duty requirements instantly.
Fueling, loading, inspection, paperwork, etc.
Remaining Drive Time (11H RULE)
6h 0m
Within legal HOS requirements
22:00
8h 0m window remaining
3h 0m
6h 0m
How to Use This Calculator
- 1
Check Default Scenario: The calculator loads with a standard mid-day scenario (starting at 08:00 AM with 5 hours of driving and 1 hour of other on-duty time) to demonstrate live mathematical calculations.
- 2
Set Your Shift Start Time: Adjust the Shift Start Time field to the exact moment you began your daily on-duty status today. The static 14-hour shift end clock will instantly recalculate.
- 3
Update Driving Hours: Type in your cumulative driving hours. The tool calculates your remaining driving allowance under the 11-hour rule.
- 4
Add Other On-Duty Tasks: Input your on-duty non-driving time (inspections, loading, fueling, paperwork). The calculator uses the "Lesser Of" rule between the 11H and 14H clocks.
- 5
Toggle the 30-Min Rest Break: Use the checkbox to toggle whether you have taken your mandatory 30-minute break. This updates your remaining drive window before a break is legally required.
What Is HOS Hours Calculator?
The HOS Hours Remaining Calculator is a specialized compliance tool designed to help commercial truck drivers and fleet operators maintain strict compliance with Federal Motor Carrier Safety Administration (FMCSA) regulations. Daily Hours of Service (HOS) rules are in place to ensure that drivers have sufficient rest to operate commercial motor vehicles (CMVs) safely, preventing fatigue-related accidents on public highways.
Truck drivers need this calculator because manual calculation of the 11-hour driving limit, the 14-hour shift window, and the 8-hour consecutive rest break trigger is incredibly complex and error-prone. For example, once a driver logs onto their daily shift, their 14-hour clock begins running continuously and cannot be paused by ordinary non-driving tasks. This tool provides instant, mathematically-accurate countdowns of your remaining driving window, shift expiration times, and upcoming mandatory 30-minute break requirements, helping drivers prevent costly DOT violations and stay out-of-service free.
HOS Rules and Regulations
Understanding the FMCSA hours of service regulations is critical for maintaining compliance and planning safe, efficient routes.
The 11-Hour Driving Limit
Under FMCSA rule 395.3, drivers of property-carrying commercial vehicles are permitted to steer for a maximum of 11 cumulative hours, unlocked only after completing 10 consecutive hours off-duty.
The 14-Hour Shift Window
The daily duty window is a rigid, continuous 14-hour clock starting the moment you perform any on-duty task. It runs continuously and cannot be paused by meals or non-driving breaks.
The 30-Minute Rest Break
Commercial drivers are legally prohibited from driving if more than 8 cumulative steering hours have elapsed without a consecutive 30-minute rest break (logged off-duty or on-duty non-driving).
Pro-Tip for Maximum HOS Efficiency
To maximize your remaining daily driving hours, synchronize your mandatory 30-minute rest break with fueling, pre-trip inspections, or document logs. Under the latest FMCSA updates, logging your break as "On-Duty Non-Driving" is fully compliant and keeps your clock optimized!
Frequently Asked Questions
Does the 11-hour driving clock stop for meals or rest breaks?
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No. The 11-hour driving limit specifies the maximum cumulative steering time allowed during a shift. While a rest break or meal does not reduce your remaining steering hours, it continues to consume your continuous 14-hour daily on-duty window, which cannot be paused.
Can I drive or do non-driving work past the 14-hour shift limit?
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No. You cannot perform any commercial motor vehicle (CMV) driving after reaching the 14th consecutive hour of coming on duty. However, you may perform non-driving work (such as loading or unloading) past the 14-hour limit, but that extra time must be logged as on-duty non-driving and cannot be followed by driving until a full 10 consecutive hours off-duty are completed.
What triggers the mandatory 30-minute HOS rest break?
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FMCSA rules require a consecutive 30-minute break after a driver has driven for a total of 8 cumulative hours without at least a 30-minute interruption. This break can be logged as off-duty, sleeper berth, or on-duty non-driving time (such as fueling or lunch).
How do I reset my daily 11-hour driving and 14-hour shift clocks?
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To fully reset both daily HOS clocks, you must take at least 10 consecutive hours of off-duty time, sleeper berth time, or a combination of both. Once this uninterrupted 10-hour rest period is completed, your full 11-hour driving clock and 14-hour duty window are completely restored.
What are the penalties for exceeding daily HOS limits?
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Violating FMCSA Hours of Service regulations can lead to severe consequences. DOT inspectors can place you Out of Service (OOS) immediately for a minimum of 10 hours, fine you and your carrier thousands of dollars, and significantly damage your company's CSA safety score.