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HOS Clock Calculator

Enter where you are in your shift and see your four hours-of-service clocks at a glance — remaining drive time, the 14-hour window (and the wall-clock time it slams shut), your 30-minute break status, and cycle hours left. Property-carrying interstate rules only.

49 CFR Part 395 — FMCSA

Presets

Where are you in the shift?

When your 14-hr window began (after 10+ hrs off)
Carrier-dependent; 70/8 is most common
Time in the driving line, this shift
Loading, fueling, inspections, etc.
Cumulative driving minutes since your last qualifying break
On-duty hrs in prior days of the rolling cycle (excludes this shift)

Your Clocks

Drive time remaining
—
of 11-hour driving limit
—
14-hour window remaining
—
expires at —
—
30-minute break
—
after 8 hrs cumulative driving
—
Cycle hours remaining
—
of the rolling limit
—
—
How each clock is figured
Drive: 11 − hours driven  ·  14-hr window: 14 − (hours since shift start); the window runs on wall-clock time and is not paused by breaks.
Break: a ≥30-min interruption is required before 8 cumulative driving hours pass  ·  Cycle: (60 or 70) − cycle hours already used.

The rules these clocks come from (49 CFR Part 395)

1111-hour driving limit. May drive a maximum of 11 hours after 10 consecutive hours off duty.
1414-hour window. May not drive beyond the 14th consecutive hour after coming on duty. Off-duty time does not extend this window (except a qualifying sleeper-berth pairing — see note).
3030-minute break. Required after 8 cumulative hours of driving without at least a 30-minute interruption. Since the 2020 rule, on-duty-not-driving time also satisfies the break.
60
7060/7 or 70/8 cycle. May not drive after 60 hours on duty in 7 consecutive days, or 70 hours in 8 consecutive days (which one applies depends on your carrier's operation).
3434-hour restart. A driver may reset the 60- or 70-hour cycle to zero by taking 34 or more consecutive hours off duty. This tool does not model the restart — enter your post-restart cycle hours as 0.
Sleeper-berth split — explanatory only, not computed here. Under the split-sleeper provision, the required 10 hours off can be taken in two qualifying periods (one of at least 7 consecutive hours in the sleeper berth, the other at least 2 consecutive hours off duty or in the berth). When the two periods pair correctly and total at least 10 hours, both are excluded from the 14-hour window. Pairing is easy to get wrong and depends on the exact sequence of your duty statuses, so this calculator intentionally does not plan or credit sleeper splits — treat the 14-hour clock above as the straight, un-split window and verify any split against your ELD and 49 CFR 395.1(g).
Source: Hours of Service of Drivers, property-carrying — 49 CFR Part 395 and FMCSA's Hours of Service summary (rules stable since the Sept 2020 final rule).

How this tool works

HOS Clock Calculator runs entirely in your browser. Inputs are evaluated with rules and constants taken from 49 CFR Part 395 (Freight & logistics). Nothing is uploaded to a server for the calculation itself.

  • Enter the values that match your load, vehicle, or scenario.
  • Results update live — treat them as a cited reference, not legal or professional advice.
  • Open the primary source linked at the top of this page before you rely on a number for compliance.

Use Copy link to share this page (including query parameters when the tool supports them) or Print for a dock/packet copy.

FAQ

Which HOS rules does this use?

Property-carrying 49 CFR Part 395 limits (11/14/70 etc. as labeled on the tool). Passenger-carrying rules differ.

Is this an ELD substitute?

No. It is a planning reference. Drivers must follow their ELD and motor-carrier policies.

Can I cite this in a claim or customer email?

You can share the link and the underlying public source. Do not present the tool as legal, medical, or insurance advice.