Work, pay & shifts
How Many Hours a Year Is a 4-On-4-Off Schedule?
The quick answer to “how many hours a year is 4 on, 4 off?” is 2,190 with 12-hour shifts. But that is an average, and the exact figure for a particular year depends on where the year starts in your rotation. This guide gives both the average and the exact range, covers leap years, and compares the result with a standard 40-hour work year.
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The average
Work falls on exactly half the days, so an average year of 365 days has 182.5 work days. Multiply by the shift length: 182.5 × 12 = 2,190 hours.
Why the exact count is 181 to 184 days
A 365-day year is 45 full cycles (360 days, 180 work days) plus 5 extra days. Those 5 days hold anywhere from 1 to 4 work days depending on where January 1 falls in your rotation:
| January 1 is | Work days in the year | Hours (12 h) |
|---|---|---|
| Work day 1 | 184 | 2,208 |
| Work day 2 | 183 | 2,196 |
| Work day 3 | 182 | 2,184 |
| Work day 4 | 181 | 2,172 |
| Off day 1 | 181 | 2,172 |
| Off day 2 | 182 | 2,184 |
| Off day 3 | 183 | 2,196 |
| Off day 4 | 184 | 2,208 |
Leap years
A 366-day year is 45 cycles plus 6 days, and those 6 days always hold at least 2 work days. So a leap year has 182 to 184 work days — 2,184 to 2,208 hours with 12-hour shifts.
By shift length
| Shift length | Average year | Range in a 365-day year |
|---|---|---|
| 8 hours | 1,460 hours | 1,448 – 1,472 |
| 10 hours | 1,825 hours | 1,810 – 1,840 |
| 12 hours | 2,190 hours | 2,172 – 2,208 |
Compared with a 40-hour week
A standard schedule of 40 hours a week for 52 weeks is 2,080 hours. A 12-hour 4-on-4-off year averages 2,190 — about 110 hours more, spread over far fewer days: 182.5 instead of 260. With 10-hour shifts it averages 1,825 hours, 255 fewer than the 40-hour year.
These are scheduled hours before leave, holidays, swaps, or overtime. The 4-On-4-Off Work Schedule Calculator counts any exact date range.
4-On-4-Off Hours per Year FAQ
- How many hours a year is 4 on 4 off with 12-hour shifts?
- 2,190 on average, and between 2,172 and 2,208 in a particular 365-day year.
- How many days a year do you work on 4 on 4 off?
- 182.5 on average; 181 to 184 in a 365-day year and 182 to 184 in a leap year.
- Is 4 on 4 off more hours than a 40-hour week?
- With 12-hour shifts, yes: about 2,190 hours a year against 2,080. With 10-hour shifts, fewer: 1,825.
- Why is the yearly count not always the same?
- A year isn’t a whole number of 8-day cycles. The leftover days hold a different number of work days depending on where the year starts in your rotation.
- How do I find the exact hours for my year?
- Enter January 1 and December 31 in the 4-On-4-Off Work Schedule Calculator, choose where January 1 falls in your rotation, and add your shift length.
Related guides
- 4-On-4-Off ExplainedHow the 8-day 4-on-4-off cycle works, why your days off move one weekday each cycle, how often weekends fall off, and typical weekly hours.
- Finding 4-On-4-Off Work DaysUse one known work day and the day count mod 8 to tell whether any future or past date is a work day or a day off, with a spreadsheet formula.
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