01 · Calculator
Quick HOS Math.
Current Shift Focus.
Dispatch questions often come down to one thing: can this driver legally take the next leg? This calculator estimates the answer from the core clocks that usually stop a move first.
Inputs
Enter current HOS clocks
This calculator estimates remaining property-carrier driving time using the standard FMCSA summary limits. It does not model sleeper-berth splits, oilfield exceptions, or the proposed 14-hour pause pilot.
Results
Estimated driving time remaining now
The key output is the amount of legal driving time available right now after considering the driving limit, duty window, break clock, and cycle hours.
Drive right now
5
Hours legally available immediately
Driving clock left
6
Out of 11 total driving hours
Duty window left
7
Out of 14 total on-duty-window hours
Driving time remains available
Under this simplified FMCSA property-carrying summary, additional driving time is still available right now.
Break clock
5 driving hours remain before a 30-minute break is required.
Cycle clock
30 on-duty hours remain in the selected 70-hour cycle.
Before next break
5 hours of additional driving are available before the break clock becomes the limiting factor.
Important note
This is a simplified estimator for property-carrying drivers under the FMCSA summary rules. Sleeper-berth split calculations, special exceptions, and ELD interpretations are not modeled here.
02 · Rules Used
Built Around the
Current FMCSA Summary
This version models the standard property-carrying federal summary limits and leaves the more complex exception handling to the driver's actual logging system.
11-Hour Driving Limit
Property-carrying drivers may drive up to 11 hours after 10 consecutive hours off duty, with the adverse driving conditions extension adding up to 2 more.
14-Hour Duty Window
Driving has to happen inside the on-duty window. Even if driving hours remain, the driver cannot keep driving once that window is exhausted.
30-Minute Break Rule
After 8 cumulative driving hours without a qualifying 30-minute interruption, more driving is blocked until the driver takes the break.
03 · Important Limits
Useful for Planning.
Not a Legal Logbook.
This tool is intentionally simpler than a real HOS engine. It helps planners and dispatchers get a fast answer, but it should not override the ELD or the carrier's compliance workflow.
No Sleeper-Birth Split Logic
Split sleeper calculations are intentionally excluded here. Those scenarios need the actual log history, not a single-screen planning estimate.
Exceptions Not Fully Modeled
Short-haul, agricultural, state-specific, and other exception-driven situations may change how the clocks work in practice.
Always Check the ELD
Before dispatching another movement, compare the estimate against the driver's actual ELD status and the carrier's compliance interpretation.
Need Another
Driver Tool?
The tools library is expanding around recurring freight, dock, and dispatch questions. If there is another planning calculator you want here, send it through.