How do I calculate my 14 hour window?

The 14 hour window starts when you come on duty after at least 10 consecutive hours off duty. It keeps running even while you rest or wait, so the time left is 14 hours minus the hours since you came on duty. You cannot drive after the window ends until you take another 10 consecutive hours off duty.

When do I need the 30 minute break?

You need a break of at least 30 consecutive minutes once you have driven 8 cumulative hours without one. The break can be time off duty, in the sleeper berth, or on duty but not driving. This calculator shows how much driving you can do before the break is due.

What is the 34 hour restart?

A driver can reset the 60 or 70 hour cycle by taking at least 34 consecutive hours off duty. After a restart, the cycle hours used start again from zero. This calculator does not model the restart, so enter the cycle hours you have used now.

Does this replace my ELD?

No. It is an estimate from the numbers you type, for planning. Your electronic logging device records are what count, and some situations, such as the sleeper berth split or adverse driving conditions, change the limits and are not covered here.

HOS calculator

An HOS calculator shows how much driving time you have left under the hours of service rules. Driving time left = the smallest of (11 hours − hours driven), (14 hours − hours since your shift started) and (your 60 or 70 hour cycle − cycle hours used).

Enter your cycle rule, the hours you have driven, the time since your shift started and your cycle hours. This free hours of service calculator also shows how much driving you can do before your 30 minute break is due. It covers the U.S. rules for property carrying drivers. No signup.

Formula: Driving time left = the smallest of (11 h − driven), (14 h − since shift start) and (cycle limit − cycle hours used)
Example: 6.5 h driven, 9 h since shift start and 58 of 70 cycle hours used leaves 4 h 30 min, set by the 11 hour limit
Source: FMCSA hours of service rules for property carrying drivers, 49 CFR Part 395
Last updated: October 14, 2026

Your cycle

The weekly limit that applies to you. Most property carrying drivers use 70 hours in 8 days, or 60 hours in 7 days.

Cycle rule

Cycle hours used

hrs

Today's shift

Hours since your last 10 consecutive hours off duty. Enter hours like 6.5, or hours and minutes like 6:30.

Hours driven

hrs

Since shift start

hrs

Driven since break

hrs

Fill in the required details above to see your results.

HOS Calculator

We take the smallest of your 11 hour, 14 hour and cycle time left to show how much you can still drive. Enter your hours on the left to see it.

Enter the hours you have driven since your last 10 hour break.

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How to use the HOS calculator

Open your ELD or logs and read off five numbers.

Choose your cycle
Pick 70 hours in 8 days or 60 hours in 7 days, whichever applies to your carrier.
Enter cycle hours used
Type the on-duty hours you have used in the current cycle, driving included.
Enter today's driving
Type the hours driven since your last 10 consecutive hours off duty. Use 6.5 or 6:30.
Enter time since shift start
Type the hours since you came on duty after that break. This is your 14 hour window clock.
Enter driving since your last break
Type the hours driven since your last break of at least 30 minutes.
Read your time left
See the 11 hour, 14 hour and cycle time left, driving before the 30 minute break, and which rule sets your limit.

The main hours of service rules

These are the federal limits for property carrying drivers that this calculator uses.

11 hour driving limit: up to 11 hours of driving after 10 consecutive hours off duty.
14 hour window: no driving after the 14th hour since coming on duty, until another 10 consecutive hours off duty.
30 minute break: needed after 8 cumulative hours of driving without a break of at least 30 consecutive minutes.
60 or 70 hour limit: no driving after 60 hours on duty in 7 days, or 70 hours on duty in 8 days.
34 hour restart: 34 consecutive hours off duty resets the 60 or 70 hour cycle.

HOS calculation example

A driver on a 70 hour, 8 day cycle has driven 6.5 hours, started the shift 9 hours ago, last took a break after 6.5 hours of driving, and has used 58 cycle hours.

Driving limit left: 11 − 6.5 = 4.5 hours.
Window left: 14 − 9 = 5 hours.
Cycle left: 70 − 58 = 12 hours.
Driving time left is the smallest of the three: 4 hours 30 minutes, set by the 11 hour limit.
Break: 8 − 6.5 = 1.5 hours of driving before the 30 minute break is due.

What this HOS calculator does not cover

It is a planning estimate, not legal advice and not a log. It does not model the sleeper berth split, adverse driving conditions, the short haul exceptions, the 34 hour restart or Canadian rules. Your ELD records are what count, so check anything close to a limit against them.

FAQ'sFrequently Asked Questions

For property carrying drivers, the federal rules set an 11 hour driving limit after 10 consecutive hours off duty, a 14 hour window that starts when the driver comes on duty, a 30 minute break after 8 cumulative hours of driving, and a weekly limit of 60 hours in 7 days or 70 hours in 8 days. The rules are in 49 CFR Part 395.

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