Twelve-hour shifts are common in nursing, manufacturing, security and logistics, and they raise a frequent question: when does overtime start? Under federal law the answer depends on the weekly total, but state rules can change that. This guide shows the math for common schedules.
The federal rule: it is the weekly total that counts
Under the Fair Labor Standards Act (FLSA), covered non-exempt employees must be paid at least one and one-half times their regular rate for hours over 40 in a workweek. Federal law has no daily overtime requirement and no daily hours limit for adult workers. A 12-hour shift is therefore not overtime by itself. What matters is the workweek total. A worker who puts in three 12-hour shifts has 36 hours and no federal overtime that week. A worker who puts in four 12-hour shifts has 48 hours and is owed 8 hours of overtime.
Pay for common 12-hour patterns under the federal rule
The table below uses a regular rate of $30.00 an hour, so overtime is $45.00. It counts only paid hours, which means a 12-hour shift here is 12 paid hours.
Weekly pay for 12-hour shifts at $30.00 an hour (federal weekly rule)
| Shifts in the workweek | Paid hours | Overtime hours | Calculation | Gross pay |
|---|---|---|---|---|
| 2 | 24 | 0 | 24 × $30 | $720.00 |
| 3 | 36 | 0 | 36 × $30 | $1,080.00 |
| 4 | 48 | 8 | 40 × $30 + 8 × $45 | $1,560.00 |
| 5 | 60 | 20 | 40 × $30 + 20 × $45 | $2,100.00 |
| 6 | 72 | 32 | 40 × $30 + 32 × $45 | $2,640.00 |
Many 12-hour schedules alternate between three and four shifts a week, for an average of 42 hours. Over a two-week cycle with 36 hours in one week and 48 in the other, the employee earns 36 × $30 = $1,080 in the first week and $1,560 in the second, for $2,640. Overtime is calculated week by week and cannot be averaged across the two weeks. The required overtime is the 8 hours that exceeded 40 in the 48-hour week, regardless of the 84-hour two-week total.
Paid hours vs. clock hours
A shift that is described as 12 hours is often 12.5 hours on the clock, with a 30-minute unpaid meal period, so only 12 hours are paid. Only a bona fide meal period in which you are fully relieved of duty can be deducted. If you work through the meal, the time is paid, and a four-shift week becomes 50 hours, not 48. See unpaid lunch break rules for how federal rules treat meal periods and automatic deductions. Short rest breaks of about 5 to 20 minutes are paid time.
Here is how that plays out. An employee works four shifts a week from 7:00 a.m. to 7:30 p.m., which is 12.5 hours on the clock, and takes a 30-minute unpaid meal each shift. Paid time is 12 hours a shift, or 48 hours, and 8 of those are overtime, for $1,560.00 at $30.00 an hour. If the meal period is interrupted so often that the employee is never fully relieved of duty, the paid time rises to 12.5 hours a shift, or 50 hours, with 10 overtime hours, and the pay becomes 40 × $30 + 10 × $45 = $1,650.00. That is $90.00 a week more, which is why accurate meal records matter on long shifts.
Where the workweek starts matters
A workweek is any fixed and regularly recurring period of 168 hours. Employers often choose a start time that fits their shifts, such as 7:00 a.m. on Sunday. When shifts cross midnight or cross the start of the workweek, the hours are split between workweeks. For example, a night shift that begins at 7:00 p.m. on Saturday and ends at 7:00 a.m. on Sunday might fall entirely within one workweek if the week starts at 7:00 a.m. on Sunday, or be split if it starts at midnight. Read overnight shift hours for worked examples.
State daily overtime changes the math
A few states require overtime based on daily hours as well as weekly hours. California requires overtime at 1.5 times the regular rate after 8 hours in a workday, and double time after 12 hours. Colorado requires overtime after 12 hours in a workday, in addition to the weekly rule. Other states have their own rules, and some industries are covered by special wage orders. A 12-hour shift is where those state rules matter most.
One 12-hour shift at $30.00 an hour: federal vs. California daily overtime
| Hours in the workday | Federal weekly rule (if the week stays at or under 40) | California daily overtime |
|---|---|---|
| Hours 1 to 8 | $30.00 each = $240.00 | $30.00 each = $240.00 |
| Hours 9 to 12 | $30.00 each = $120.00 | $45.00 each = $180.00 |
| Hours over 12 | Same rate unless over 40 in the week | $60.00 each (double time) |
| Total for a 12-hour day | $360.00 | $420.00 |
With three 12-hour shifts in a California workweek, the employer owes 3 × $420 = $1,260.00, compared with $1,080.00 under the federal weekly rule. With four 12-hour shifts, there are 16 daily overtime hours and 8 hours over 40 in the week. Hours are not paid twice, so the overtime hours are the greater of the two counts: 16. Pay is 32 × $30 + 16 × $45 = $960 + $720 = $1,680.00, which is $120.00 more than the federal result of $1,560.00. See California overtime rules for more, including the seventh consecutive day rule. For multiplier tables and more double-time examples, see double time pay rules. California also allows alternative workweek schedules, including 12-hour shifts for certain health care employees, that change when daily overtime starts if the employer adopts them in the required way, so ask your employer whether one applies.
Hospitals and the 8-and-80 option
Hospitals and residential care facilities may use a 14-day work period with overtime for hours over 8 in a day and 80 in the period, if the employee agrees in advance. For a nurse who works 12-hour shifts, that daily test makes every shift include 4 overtime hours, so many hospitals do not use it. Compare the two in the 8 and 80 overtime rule.
Differentials, bonuses and other pay in 12-hour jobs
Many 12-hour jobs, such as nursing, manufacturing and security, pay a night, weekend or shift differential. Those payments are included in the regular rate, so overtime in a week with differentials is higher than overtime on the base wage; read overnight shift hours for the weighted average method. Production and attendance bonuses are handled the same way; see how bonuses affect overtime pay.
Is there a limit on 12-hour shifts?
Federal wage law does not cap how many hours an adult may be scheduled to work, and employers can usually require 12-hour shifts. Some laws limit hours for specific jobs, such as commercial drivers, and some states restrict mandatory overtime for certain health care workers. See can my employer make me work overtime for the general rules.
How to check your own 12-hour pay
- Record the real start, end and unpaid meal break for each shift, and total each workweek with the Weekly Time Card Calculator.
- Find your employer's workweek start so you know which shifts belong in which week.
- Count hours over 40 in each week, and for daily overtime states count hours over the daily threshold as well.
- Compute the pay with the Overtime Pay Calculator and compare it with your pay stub; see how to read a pay stub.
- Raise any difference with payroll in writing.
Frequently Asked Questions
Do 12-hour shifts get overtime?
Under federal law, only hours over 40 in a workweek are overtime. Three 12-hour shifts are 36 hours with no overtime, while four are 48 hours with 8 overtime hours. Some states add daily overtime.
How much overtime is a 4 x 12 schedule?
Under the federal weekly rule, four 12-hour paid shifts total 48 hours, and 8 are overtime, paid at 1.5 times the regular rate.
Is the 12th hour double time?
Not under federal law. In California, hours over 12 in a workday are paid at double time. Other states differ.
Are 12-hour shifts 12 paid hours?
Not always. A shift can be 12.5 hours on the clock with a 30-minute unpaid meal, which leaves 12 paid hours. If you work through the meal, it is paid.
Can overtime be averaged over two weeks for 12-hour shifts?
No. Federal overtime is calculated for each workweek separately, even if you are paid every two weeks.
Do nurses on 12-hour shifts get overtime after 8 hours?
Only if the employer uses the 8-and-80 system under federal law or a state daily overtime rule applies. Otherwise overtime begins after 40 hours in the workweek.
Related tools & guides
This guide is for general informational purposes only and is not legal, tax, or financial advice. Labor laws vary by state and change over time. Confirm your specific situation with your employer, HR department, or the U.S. Department of Labor.