3-on-3-off Shift Calculator
How Does the 3-on-3-off Shift Pattern Work?
The 3-on-3-off pattern is a 12-hour rotating schedule based on a simple, equal split: you work 3 consecutive shifts and then rest for 3 consecutive days. The full cycle runs over 12 days and follows this sequence: 3 day shifts, 3 rest days, 3 night shifts, 3 rest days. Then it starts again.
Four teams rotate through the pattern to ensure 24-hour, 7-day coverage. At any point in the cycle, one team is on day shifts, one is on nights, and two are resting — providing a clean overlap-free rotation. The equal split between working and rest days — 6 working days per cycle, 6 rest days — makes the pattern feel fair and easy to plan around.
Shifts are typically 12 hours: days from 07:00 to 19:00 and nights from 19:00 to 07:00. Over the 12-day cycle this works out to 72 hours in a 12-day window, which averages to approximately 42 hours per week — consistent with other 12-hour rotating patterns.
In nursing, the 3-on-3-off is closely associated with the Baylor plan and similar weekend-concentrated scheduling arrangements, though the full rotating day/night version described here is distinct from the pure weekend Baylor scheme. The three-day working block is well-suited to nurses and other healthcare workers because it allows a longer recovery window between shifts and makes it easier to arrange childcare or study around work.
The pattern is also common in security, some manufacturing sectors, and mental health services where 12-hour shifts are standard. Workers generally value the predictability — you always know you will have 3 days off after every working run — and the fact that the rest blocks are long enough to feel genuinely restorative rather than just a gap to sleep.
The transition from days to nights within the cycle requires some adjustment. After 3 rest days you switch from day shifts to night shifts (or vice versa), and your body needs time to adapt. Good sleep habits, light management, and careful eating make a significant difference during those first nights after switching.
How to Use This Calculator
- Select the 3-on-3-off card — it should already be highlighted on this page. Choose your team letter (A, B, C, or D) from the selector that appears on the card.
- Enter your cycle start date — the first day of your current 12-day cycle. If your rota runs on a different label system, identify which position in the cycle you are at and count back to the cycle start.
- Click "Show my 12-month calendar" — your full year appears with day shifts in blue, night shifts in dark navy, and rest days in grey. Bank holidays are flagged automatically. Export to Google Calendar or iCal to get your shifts on your phone.
Frequently Asked Questions
What is the 3-on-3-off shift pattern?
The 3-on-3-off pattern means 3 consecutive 12-hour shifts followed by 3 days off. The full rotating cycle is 12 days: 3 days, 3 off, 3 nights, 3 off — then repeat. Four teams share the cycle for continuous 24/7 coverage.
How many hours a week is 3-on-3-off?
On a 3-on-3-off pattern with 12-hour shifts the average working week is approximately 42 hours. Individual calendar weeks will vary — you may work 36 hours one week and 48 the next — but the 12-day cycle averages out to 42 hours per week.
Is 3-on-3-off good for nursing?
Yes — the 3-on-3-off pattern is well-regarded in nursing because the 3-day working block allows nurses to complete their shifts in a concentrated window, leaving longer, uninterrupted rest periods. This is better for sleep recovery than scattered single shifts. It is especially popular in intensive care units, emergency departments, and surgical wards.
How many weekends off do you get on 3-on-3-off?
The 12-day cycle drifts through the 7-day calendar week, so your rest days rotate across different weekday positions over time. You will get roughly half your weekends off throughout the year, though the exact distribution depends on your cycle start date and team. The calendar above calculates this precisely for your specific situation.
What is the difference between 3-on-3-off and 2-2-3?
Both use 12-hour shifts and four teams, averaging about 42 hours per week. The 3-on-3-off runs a 12-day cycle with consistent 3-day working and rest blocks. The 2-2-3 runs a 14-day cycle with alternating 2-day and 3-day blocks. Workers who prefer consistent block lengths tend to find 3-on-3-off easier to plan around; those who prefer more frequent but shorter rest breaks may prefer 2-2-3.
How do I know which team I'm on?
Your employer assigns you to a team (A, B, C, D — sometimes Red, Blue, Green, Yellow). Each team works the same pattern but offset from the others so the workplace stays covered. Check your employment contract, rota notice board, or pay slip, or ask your line manager. Picking the wrong team in the calculator above will show you the opposite days, so it's worth confirming before you rely on the calendar.
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