Dot Hours of Service Calculator

DOT Hours of Service Calculator

Your HOS Status:

function calculateHOS() { var hoursDrivenToday = parseFloat(document.getElementById('hoursDrivenToday').value); var hoursOnDutyToday = parseFloat(document.getElementById('hoursOnDutyToday').value); var hoursOnDutyWeekly = parseFloat(document.getElementById('hoursOnDutyWeekly').value); var weeklyLimitType = document.querySelector('input[name="weeklyLimitType"]:checked').value; var hoursDrivenSinceLastBreak = parseFloat(document.getElementById('hoursDrivenSinceLastBreak').value); // Input validation if (isNaN(hoursDrivenToday) || isNaN(hoursOnDutyToday) || isNaN(hoursOnDutyWeekly) || isNaN(hoursDrivenSinceLastBreak) || hoursDrivenToday < 0 || hoursOnDutyToday < 0 || hoursOnDutyWeekly < 0 || hoursDrivenSinceLastBreak < 0) { document.getElementById('hosResult').innerHTML = '

Error:

Please enter valid positive numbers for all fields.'; return; } var result11Hour = "; var result14Hour = "; var resultWeekly = "; var result30MinBreak = "; // 11-Hour Driving Limit var remainingDriving = 11 – hoursDrivenToday; if (remainingDriving < 0) { result11Hour = '11-Hour Driving Limit: VIOLATION! You have driven ' + Math.abs(remainingDriving).toFixed(1) + ' hours over the limit.'; } else if (remainingDriving === 0) { result11Hour = '11-Hour Driving Limit: You have reached your 11-hour driving limit. Stop driving immediately.'; } else { result11Hour = '11-Hour Driving Limit: You have ' + remainingDriving.toFixed(1) + ' hours of driving time remaining.'; } // 14-Hour On-Duty Limit var remainingOnDuty = 14 – hoursOnDutyToday; if (remainingOnDuty < 0) { result14Hour = '14-Hour On-Duty Limit: VIOLATION! You have been on duty ' + Math.abs(remainingOnDuty).toFixed(1) + ' hours over the limit.'; } else if (remainingOnDuty === 0) { result14Hour = '14-Hour On-Duty Limit: You have reached your 14-hour on-duty limit. You must go off duty.'; } else { result14Hour = '14-Hour On-Duty Limit: You have ' + remainingOnDuty.toFixed(1) + ' hours of on-duty time remaining.'; } // 60/70-Hour Weekly Limit var weeklyLimit = (weeklyLimitType === '60') ? 60 : 70; var remainingWeekly = weeklyLimit – hoursOnDutyWeekly; if (remainingWeekly < 0) { resultWeekly = '' + weeklyLimit + '-Hour Weekly Limit: VIOLATION! You are ' + Math.abs(remainingWeekly).toFixed(1) + ' hours over your weekly limit.'; } else if (remainingWeekly === 0) { resultWeekly = '' + weeklyLimit + '-Hour Weekly Limit: You have reached your weekly on-duty limit.'; } else { resultWeekly = '' + weeklyLimit + '-Hour Weekly Limit: You have ' + remainingWeekly.toFixed(1) + ' hours of weekly on-duty time remaining.'; } // 30-Minute Break Rule if (hoursDrivenSinceLastBreak >= 8) { result30MinBreak = '30-Minute Break Rule: You have driven ' + hoursDrivenSinceLastBreak.toFixed(1) + ' hours since your last break. A 30-minute break is REQUIRED.'; } else { result30MinBreak = '30-Minute Break Rule: A 30-minute break is not yet required (you\'ve driven ' + hoursDrivenSinceLastBreak.toFixed(1) + ' hours since your last break).'; } document.getElementById('result11Hour').innerHTML = result11Hour; document.getElementById('result14Hour').innerHTML = result14Hour; document.getElementById('resultWeekly').innerHTML = resultWeekly; document.getElementById('result30MinBreak').innerHTML = result30MinBreak; }

Understanding DOT Hours of Service (HOS) Regulations

For commercial truck drivers, adhering to the Department of Transportation (DOT) Hours of Service (HOS) regulations is not just a matter of compliance; it's crucial for safety, preventing fatigue-related accidents, and avoiding hefty fines. These rules dictate how long a driver can operate a commercial motor vehicle (CMV) and when they must take breaks or be off duty.

Key HOS Rules Explained:

The DOT HOS regulations are designed to ensure drivers get adequate rest. Here are the primary rules:

1. 11-Hour Driving Limit: A driver may drive a maximum of 11 hours after 10 consecutive hours off duty. This means once you start your shift after a 10-hour break, you cannot drive for more than 11 hours within that shift.
2. 14-Hour On-Duty Limit: A driver may not drive after 14 consecutive hours on duty, following 10 consecutive hours off duty. This 14-hour period includes all on-duty time (driving, loading/unloading, inspections, etc.) and cannot be extended by breaks. Once this 14-hour window starts, it continues to tick down, regardless of whether you are driving or not.
3. 60/70-Hour On-Duty Limit: This rule restricts the total number of on-duty hours over a rolling period:
   • 60-Hour Limit: A driver may not drive after 60 hours on duty in 7 consecutive days.
   • 70-Hour Limit: A driver may not drive after 70 hours on duty in 8 consecutive days.
   Most carriers operate under the 70-hour/8-day rule. Once you hit this limit, you must take a 34-hour (or longer) restart break to reset your available hours.
4. 30-Minute Break Rule: Drivers must take a 30-minute break after 8 cumulative hours of driving time. This break can be taken while off-duty or in the sleeper berth, but it must be a continuous 30-minute period.

How to Use the DOT Hours of Service Calculator:

Our calculator simplifies the complex HOS rules, helping you quickly determine your remaining driving and on-duty hours. Simply input the following information:

• Hours Driven Today: Enter the total hours you have driven since your last 10-hour off-duty period.
• Hours On-Duty Today: Input the total hours you have been on duty (driving and non-driving tasks) since your last 10-hour off-duty period.
• Total On-Duty Hours in Last 7/8 Days: Provide your cumulative on-duty hours for the rolling 7 or 8-day period.
• Weekly Limit Type: Select whether your operation follows the 60-hour (7-day) or 70-hour (8-day) weekly limit.
• Hours Driven Since Last 30-Min Break: Enter the total driving hours accumulated since you last took a 30-minute break, or since the start of your shift if no break has been taken yet.

Click "Calculate HOS" to get an instant breakdown of your remaining hours for each rule and any potential violations or upcoming requirements.

Example Scenario:

Let's say a driver has:

• Driven 6.5 hours today (since last 10-hour break).
• Been on duty for 9.0 hours today (since last 10-hour break).
• Accumulated 48.0 hours on duty in the last 7 days.
• Operates under the 60-hour (7-day) weekly limit.
• Driven 6.5 hours since their last 30-minute break.

Using the calculator, the results would show:

• 11-Hour Driving Limit: 4.5 hours of driving time remaining.
• 14-Hour On-Duty Limit: 5.0 hours of on-duty time remaining.
• 60-Hour Weekly Limit: 12.0 hours of weekly on-duty time remaining.
• 30-Minute Break Rule: A 30-minute break is not yet required (they've driven 6.5 hours since their last break, which is less than 8 hours).

This driver is in good standing but needs to be mindful of their 11-hour driving limit and the upcoming 30-minute break requirement.

Important Disclaimer:

This calculator is a helpful tool for estimating your Hours of Service status based on the inputs provided. It is not a substitute for official logbooks, Electronic Logging Devices (ELDs), or professional legal advice. Always refer to the official FMCSA regulations and your company's specific policies to ensure full compliance.