HOS Calculator | FMCSA Hours of Service Calculator
Free Hours of Service calculator for truck drivers. Calculate your remaining driving hours, on-duty time, and cycle hours to stay FMCSA compliant.
HOS Hours Calculator
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Understanding the 11-Hour Driving Rule
The FMCSA 11-hour driving rule is one of the most important Hours of Service regulations for commercial motor vehicle drivers. Under this rule, you may drive a maximum of 11 hours after 10 consecutive hours off duty. This limit applies to all CMV drivers who are required to maintain a Record of Duty Status (RODS).
The 11-hour rule is designed to prevent fatigued driving, which is a leading cause of truck accidents. Once you have driven for 11 hours, you must take a 10-hour off-duty period before you can drive again. This rule cannot be extended under any circumstances, and violations can result in significant fines and CSA points.
The 14-Hour On-Duty Rule Explained
The 14-hour rule limits your total on-duty window to 14 consecutive hours after coming on duty following 10 consecutive hours off duty. This is often called the "14-hour window" or "driving window." Once this window closes, you cannot drive again until you have another 10 consecutive hours off duty.
Important: The 14-hour clock cannot be stopped or paused. Even if you take a break, your 14-hour window continues to run. This is why proper trip planning is essential. Many drivers mistakenly think that taking breaks will extend their driving window, but this is not the case under FMCSA regulations.
60/7 and 70/8 Day Cycle Rules
The cycle rules limit the total number of hours you can work over a 7 or 8 day period. If your carrier operates every day of the week, you follow the 70-hour/8-day rule. If your carrier does not operate every day, you follow the 60-hour/7-day rule.
- 60/7 Day Rule: You cannot drive after being on duty 60 hours in any 7 consecutive days
- 70/8 Day Rule: You cannot drive after being on duty 70 hours in any 8 consecutive days
- 34-Hour Restart: You can reset your cycle by taking 34 consecutive hours off duty
30-Minute Break Requirement
Drivers using the short-haul exception who drive within a 150 air-mile radius are not required to take the 30-minute break. However, all other CMV drivers must take a 30-minute break when they have driven for a period of 8 cumulative hours without at least a 30-minute interruption.
The break can be satisfied by any non-driving period of 30 consecutive minutes, including on-duty not driving, off-duty, sleeper berth, or any combination of these. This flexibility allows drivers to use fueling stops, loading/unloading time, or rest breaks to satisfy the requirement.
HOS Calculator FAQ
How do I calculate my remaining driving hours?
Subtract your current driving hours from 11 (the maximum allowed). For example, if you've driven 6 hours, you have 5 hours remaining. Also check your 14-hour window and cycle hours.
What happens if I exceed the 11-hour driving limit?
Exceeding the 11-hour limit is a serious HOS violation that can result in fines up to $16,000 per violation, CSA points, and being placed out of service until you complete a 10-hour break.
Can I pause my 14-hour clock by taking a break?
No, the 14-hour clock cannot be paused or stopped. It runs continuously from the time you come on duty until 14 hours have passed, regardless of breaks taken.
What is the 34-hour restart rule?
The 34-hour restart allows you to reset your 60/70-hour cycle by taking 34 consecutive hours off duty. After completing the restart, you begin a new 7 or 8 day cycle.
Do I need an ELD to track my HOS?
Most commercial drivers are required to use an ELD to track their Hours of Service. Exceptions include drivers using the short-haul exception, drivers of vehicles manufactured before 2000, and driveaway-towaway operations.
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