Thirty-six scheduled hours means zero overtime by default. Model what a picked-up fourth shift is actually worth once the workweek boundary is applied.
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Standard FLSA: overtime applies after 40h in any Sun–Sat workweek within this period.
Gross Pay — This Period
$0.00
A 3x12 roster is three twelve-hour shifts a week — 36 scheduled hours, or 34.5 paid once a thirty-minute unpaid meal break comes out. It is the dominant pattern in acute-care nursing, hospital pharmacy, respiratory therapy and imaging, and with 4x10 and the 8-hour rotation it is one of only three schedules in this calculator whose baseline produces no overtime at all.
That makes 3x12 the inverse of the long-hours patterns here. The question is not how much overtime the roster generates — it is what has to happen before any appears, and why picking up extra shifts so often fails to produce it.
Add a fourth twelve-hour shift and you are at 48 scheduled hours, 46 paid, and six overtime hours. That only holds if all four shifts land inside the same workweek.
Hospital scheduling rarely cooperates. Blocks are commonly built Friday-Saturday-Sunday, or Saturday-Sunday-Monday, precisely because those runs cover weekend need. Against a Sunday-to-Saturday workweek, a Friday-Saturday-Sunday block puts two shifts in one workweek and one in the next. Because the boundary splits the block, you can work six twelve-hour shifts in eight days — seventy-two scheduled hours — and still sit at only 34.5 paid hours in each of the two workweeks involved, with no overtime at all.
This is the origin of the most common complaint in 3x12 nursing pay: working what feels like an enormous stretch and seeing barely any premium. It is usually not a payroll error. The Fair Labor Standards Act counts by workweek, the block straddled the boundary, and the hours split. Find your employer's workweek start day — it is on the stub, and it is often not Sunday — then set the calendar here to match, and code the picked-up shifts explicitly.
The same mechanism works in your favour if you self-schedule. Six shifts clustered into one workweek and none in the next pays very differently from six shifts spread evenly, even though the hours and the differentials are identical. On a $38 base wage, the overtime premium on six shifts is $0 when they split three and three, $114 when they split four and two, and $551 when all six land in one workweek.
Hospitals and residential care establishments have an option no other employer type has. Under the FLSA's 8-and-80 provision, such an employer may agree with employees to use a fourteen-day work period instead of the standard workweek, paying overtime for hours worked beyond eight in any day and beyond eighty in the fourteen-day period.
The consequence for a twelve-hour shift is immediate. Under 8/80, every hour past the eighth in a shift is overtime — so a standard 11.5 paid hours produces 3.5 overtime hours, on every shift, before anyone picks anything up. Six shifts a fortnight becomes 21 overtime hours from an ordinary roster that produces zero under the standard rule.
8/80 requires an agreement with the employee and has to be applied consistently. It is not universal, and plenty of hospitals never adopted it. Check your stub: if you see overtime lines on weeks where you worked only three shifts, you may well be on 8/80, and the standard setting here will understate your pay. Model that case by treating the daily excess explicitly rather than relying on the weekly threshold.
Many facilities run a weekend option — two or three twelve-hour weekend shifts paid at a premium rate or at full-time equivalency for reduced hours. Where that premium is expressed as a percentage uplift, enter it in the weekend differential field; where it is a flat higher base rate for those shifts only, model those days separately.
Night and weekend differentials apply to every paid hour inside their window, including hours that are also overtime hours. They are separate entitlements from the overtime multiplier, not alternatives to it, and a night shift that is also an overtime shift should show both on your stub.
One structural detail catches 3x12 workers out on the benefits side rather than the pay side. Thirty-six scheduled hours is commonly classified as 0.9 full-time equivalency, and some employers accrue paid time off, pension contributions and shift-credit against scheduled hours rather than paid hours. Where a thirty-minute unpaid break is deducted, the accrual base can be 34.5 hours rather than 36, quietly reducing annual leave accrual by around seventy-eight hours of credit a year. That figure never appears on a pay stub, so compare your accrual rate against your paid-hours total rather than your roster.
Finally, watch the self-scheduling window itself. Where a unit opens picked-up shifts on a rolling basis, the shifts that appear last are usually the ones nobody wanted — and they are frequently the ones that would have crossed you over the threshold. Model the workweek before you commit to the shift rather than after, using the calendar coding here to place it in the correct week.
