6 On 3 Off Calculator
Updated November 2026 · Free · No sign-up
Calculate the 6 on 3 off schedule — Six consecutive 8-hour shifts followed by 3 days off, in a rolling 9-day cycle that drifts across the week. See your average weekly hours, annual hours, and the next weeks of the rotation from any start date.
Quick answer: The 6 On 3 Off runs a 9-day cycle with 6 shifts of 8 hours — averaging 37.3 hours/week (1947 hours/year) across 3 crews for continuous coverage.
The Pattern
Six consecutive 8-hour shifts followed by 3 days off, in a rolling 9-day cycle that drifts across the week. Four numbers define it:
| Cycle length | 9 days | Shifts per cycle | 6 x 8h |
| Average week | 37.3 hours | Annual hours | ~1947 |
| Crews for 24/7 | 3 | Typical users | retail management, healthcare support, postal operations |
Worked Example
At $28/hour, the 37.3-hour average week grosses about $1,045/week — but pay varies BY WEEK with the rotation: weeks containing more shifts cross 40 hours and trigger overtime under weekly-OT rules, while light weeks run short. Many employers average or use period-based agreements; check how yours handles the heavy weeks.
Strengths and Trade-offs
Works well: regular 3-day breaks; 8-hour days keep single shifts manageable.
Watch for: six-in-a-row fatigues by day five, and the drifting weekend frustrates family scheduling. Night blocks also trigger night differentials where policy provides.
Overtime and Pay-Period Mechanics
Fixed-cycle schedules interact awkwardly with weekly overtime laws: a 9-day cycle does not align with 7-day workweeks, so some weeks exceed 40 hours even though the AVERAGE is 37.3. US employers handle it with premium built into rates, period agreements, or straight OT payment on heavy weeks; California daily rules add 1.5x past 8 hours (2x past 12) on every 8-hour shift unless an alternative workweek was adopted — see the California overtime calculator.
Living on This Rotation
Sleep research favors forward rotation and consistent blocks; the long off-stretches are this pattern’s reward — plan them like mini-vacations rather than recovery-only time. Swaps should trade like-for-like blocks to keep the cycle (and the pay averaging) intact. For planning days off around the rotation, the cycle preview below maps any month.
Frequently Asked Questions
What is the 6 on 3 off schedule?
Six consecutive 8-hour shifts followed by 3 days off, in a rolling 9-day cycle that drifts across the week. It averages 37.3 hours/week over the 9-day cycle.
How many hours a year is this schedule?
About 1947 hours — 6 shifts x 8 hours per 9-day cycle, across 365 days.
Does this pattern trigger overtime?
Weeks with more shifts than average can exceed 40 hours even though the cycle averages 37.3 — weekly-OT jurisdictions owe premiums on those weeks unless a lawful averaging agreement applies.
How many crews does 24/7 coverage need?
3 crews rotate this pattern for continuous coverage — each crew offset within the cycle.
How many hours per week is 6 on 3 off?
About 37.3 on average (48 hours across each 9-day cycle) — under 40, but calendar weeks containing all 6 shifts hit 48 and may owe overtime.
✓ Formula verified • Last updated: November 3, 2026