Calculate your Hours of Service instantly. Know exactly how many hours you have left.
Updated for 2026 FMCSA regulations • Mobile-friendly • No signup required
Learn how to calculate your HOS hours, avoid violations, and maximize your legal driving time.
8-day rolling cycle
Used
Available
Gaining Tomorrow
💡 Pro Tip: Need a full reset? Take a 34-hour restart (including two 1am-5am periods) to reset your clock to zero.
*Based on US DOT FMCSA 70-Hour/8-Day rule. Always verify with your ELD.
2026 HOS Compliance Survival Guide
Master Hours of Service regulations with our comprehensive free guide. Avoid violations, protect your CDL, and maximize your driving time legally.
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The 70-hour/8-day rule is the cornerstone of FMCSA Hours of Service regulations for property-carrying drivers. Under this rule, you cannot drive after being on duty for 70 hours in any 8 consecutive days. Unlike a fixed weekly limit, this is a rolling window that recalculates every day.
Each day, hours from 9 days ago "roll off" your total, giving you back available hours. This calculator automatically tracks this for you, showing exactly how many hours you'll gain tomorrow when your oldest day's hours drop off.
Driving after 11 cumulative hours of driving time since your last 10-hour off-duty period.
Driving after 14 consecutive hours on-duty, even if you haven't used all 11 driving hours.
Exceeding 70 hours of on-duty time in any 8-day period without a 34-hour restart.
Driving after 8 hours without taking a required 30-minute off-duty or sleeper berth break.