CalcOvertime is the most legislated arithmetic in American work: a Depression-era law, the Fair Labor Standards Act, that turned “extra hours” into a precise formula with federal enforcement behind it. The formula is genuinely simple, time and a half after 40 hours in a week, and yet real paychecks manage to get it wrong constantly, because the inputs (which workers, which hours, which rate) each carry rules most employees have never been shown. This guide is the missing orientation.
The federal baseline: 40 hours, one workweek, time and a half
The FLSA requires covered, non-exempt employees to receive at least 1.5 times their regular rate for hours worked past 40 in a defined workweek. Three details in that sentence do all the work. The workweek is any fixed, recurring 168 hours the employer designates, and it resets weekly: averaging is prohibited, so 50 hours this week and 30 next week means 10 overtime hours, full stop, even though the two-week total is 80. Hours worked means actually worked: paid holidays, vacation, and sick days do not count toward the 40 unless your employer chooses otherwise. And the regular rate is broader than your hourly wage, which is where the interesting math lives below.
The basic calculation, worked
A $20 per hour employee works 48 hours:
| Component | Math | Pay |
|---|---|---|
| Regular time | 40 x $20 | $800 |
| Overtime | 8 x $30 | $240 |
| Week total | 48 hours | $1,040 |
Effective rate for the week: $21.67 per hour. Overtime lifts the whole week’s average, which is exactly the comparison the overtime calculator charts when you give it your own numbers, and the lens the salary vs hourly guide uses to compare offers with different overtime realities.
Exempt or non-exempt: the question that decides everything
Overtime protection covers non-exempt employees. Exempt status, no overtime owed, requires passing both of two tests: a salary basis above a Department of Labor threshold (a floor in the several-hundred-dollars-per-week range that DOL periodically updates), and a duties test matching genuine executive, administrative, professional, outside sales, or certain computer roles. The title on your badge is irrelevant; the duties are what count, and “salaried” alone does not mean exempt. A salaried employee below the threshold, or whose real duties fail the test, is owed overtime on top of salary. Misclassification is among the most common wage violations in the country, and the back-pay liability runs two to three years, which is why the question is worth asking precisely rather than assuming.
The regular rate: bigger than your hourly wage
Overtime multiplies the regular rate, and the regular rate legally includes most non-discretionary extras earned that week: production bonuses, shift differentials, commissions. A promised $100 attendance bonus in a 48-hour week raises the regular rate by about $2.08, which raises each overtime hour by about $1.04. Employers who pay overtime on the bare wage while ignoring bonuses are underpaying in a way that compounds every big week. Truly discretionary gifts and benefits stay out; anything promised in advance goes in.
Two rates, one week: the weighted average
Work 30 hours at $20 and 15 hours at $16 for the same employer and the week has 45 hours across two rates. The method: straight-time pay first, 30 x 20 + 15 x 16 = $840; regular rate is $840 / 45 = $18.67; the 5 overtime hours then earn an additional half-time premium, 5 x $9.33 = $46.67, for a week total of $886.67. Every hour was already paid once at its own rate; overtime adds the 0.5 premium on the blended rate. This weighted-average machinery is exactly what multi-role healthcare, warehouse, and restaurant paychecks are supposed to run, and often don’t.
Enter your rate and weekly hours to see regular pay, overtime pay, your true effective hourly rate, and a bar chart of the split.
State rules that beat the federal floor
States may exceed the FLSA, and several do. California is the headline: overtime after 8 hours in a day, double time after 12 in a day, plus rules for seventh consecutive workdays. Alaska, Nevada, and Colorado also trigger daily overtime in defined situations. A 4-day, 10-hour schedule is overtime-free federally and in most states, but generates 2 daily overtime hours per day in California unless run under a formally adopted alternative workweek. Where state and federal rules differ, the employee gets the more protective one. Know your state before judging your stub.
The overtime tax myth, retired
No, overtime is not taxed at a higher rate. Every overtime dollar is ordinary income taxed at your marginal bracket like any other dollar, as unpacked in marginal vs effective rates. The illusion comes from withholding: payroll annualizes each check, so one 55-hour week is withheld as if you earn that every week, over-collecting temporarily and reconciling at filing. A big overtime week always increases your take-home, both this week and for the year; anyone declining hours “because taxes eat it” is donating premium-rate pay to a misunderstanding.
Comp time, off the clock, and other traps
Private employers cannot substitute compensatory time off for overtime pay; that arrangement is legal only in public-sector jobs under specific rules. Time worked off the clock, prep, closing duties, required training, answering messages, is compensable work that counts toward the 40, and unauthorized overtime must still be paid (the employer’s remedy is discipline, not nonpayment). Automatic meal-break deductions for breaks actually worked through are a recurring violation. Travel between job sites during the day counts; the ordinary home commute does not. If several of these ring familiar, your records of hours worked are the evidence that matters.
Reading overtime on a biweekly stub
Overtime is computed per workweek, but most people are paid for two workweeks at once, and the stub blends them. A biweekly period containing a 48-hour week and a 36-hour week shows 84 hours: 76 at straight time and 8 at the premium, even though the naive average is a tidy 42. Payroll systems label the lines differently (OT, OT 1.5, premium, or a blended figure), and the check-the-math habit is straightforward: identify each workweek’s hours separately, apply the 40-hour test to each, and confirm the premium hours match. Where the stub only shows totals, the timekeeping system has the per-week split, and you are entitled to understand it; the pay frequency guide covers why the pay period and the workweek are deliberately different clocks.
Special regimes: hospitals, highways, and tips
A few industries run modified rules worth knowing if you live in them. Hospitals may adopt the 8/80 system: overtime after 8 hours in a day or 80 in a fourteen-day period, whichever pays more, a structure built for twelve-hour nursing schedules. Interstate truck drivers largely sit outside FLSA overtime under the motor carrier exemption, one reason driver pay is structured per mile. Certain agricultural work is exempt federally, with states increasingly filling the gap. And tipped employees earn overtime on the full minimum wage, not the reduced cash wage: the premium is calculated before the tip credit is applied, a distinction restaurants get wrong often enough that it headlines wage-theft settlements. None of these regimes lowers the floor below the printed rules; they change which printed rules apply.
Same hours, different weeks, different pay
Because the 40-hour test resets weekly, the calendar placement of hours changes the check. Eighty hours as 40 + 40 pays zero premium; the same eighty as 45 + 35 pays five premium hours; as 50 + 30 it pays ten. Workers with schedule influence quietly use this: stacking a project’s long days inside one workweek converts ordinary hours into premium ones, while an employer spreading the same work across weeks is, legally, minimizing overtime rather than stealing it. The line between the two is manipulation of the records versus management of the schedule: moving hours on paper after they were worked is a violation; moving shifts on the calendar before they are worked is just scheduling.
Rounding, shaving, and the fluctuating workweek
Three edges where paychecks leak. Time-clock rounding to the nearest increment is lawful only if it averages out neutrally over time; systems that always round in the employer’s favor are not rounding, they are shaving. Auto-deducted meal breaks that you actually worked through are compensable and count toward the 40. And a legitimate but frequently misapplied structure called the fluctuating workweek pays salaried non-exempt employees a half-time premium on a regular rate that falls as hours rise; it is legal under strict conditions and profitable to misuse, so if your overtime premium shrinks in your busiest weeks, that is the clause to look up. Records beat recollections in every one of these disputes, which is why a private log of actual hours is the cheapest insurance in wage law.
Overtime hours vs a raise: pricing your time honestly
Steady overtime and a raise both grow the paycheck, and they are not the same deal. Take a $20-per-hour employee. A 10% raise adds $2 to all 2,080 annual hours: $4,160 a year for zero additional time. Five standing overtime hours a week adds 5 x $30 x 52 = $7,800, nearly double the raise, but purchased with 260 hours of your year, an extra six and a half workweeks. Per marginal hour the overtime pays $30 gross, roughly $23 after typical withholding; whether that clears your personal bar depends on what those evenings were worth, which is precisely the framework the salary vs hourly guide applies to whole job offers. The trap to avoid is treating chronic overtime as a raise: the raise compounds into every future raise, bonus percentage, and 401(k) match, while overtime vanishes the week the schedule changes. Take the overtime money happily; just never price your lifestyle to it.
The sixty-second stub audit
Big-overtime paychecks deserve one minute of arithmetic before they are filed away. Split the period into its two workweeks and confirm the over-40 hours in each match the premium hours paid. Multiply your rate by 1.5 and check it against the overtime rate printed. If a production or attendance bonus landed that week, confirm the overtime rate rose with it rather than riding the bare wage. Scan for an auto-deducted lunch on a day you worked through. And compare year-to-date overtime hours against your own log once a month. Ninety-plus percent of the time everything matches, and the minute was cheap; the remaining times, the minute was very well paid.
Frequently asked questions
Is overtime required after 8 hours in a day?
Not federally: the federal trigger is 40 in a week. California and a few other states add daily triggers; check your state.
Do holidays and weekends automatically pay overtime?
No federal rule says so. Weekend or holiday premiums are employer policy or contract unless those hours also push you past 40 actually worked.
Can my employer make me work overtime?
Generally yes for adults, mandatory overtime is legal in most jobs, provided every overtime hour is paid correctly.
Does PTO count toward my 40 hours?
Not for FLSA purposes. A week of 32 worked hours plus 8 holiday hours has zero federal overtime even though the paycheck shows 40.
I’m salaried non-exempt. How is my overtime figured?
Your salary is converted to a regular rate (typically salary divided by the hours it is intended to cover) and hours past 40 earn the premium on that rate.
How far back can unpaid overtime be claimed?
Two years under the FLSA, three for willful violations, through a DOL complaint or private action; state windows can be longer, and successful claims typically add liquidated damages equal to the unpaid amount.
Price your own week in the overtime calculator, see what the bigger check nets after withholding in the paycheck taxes guide, compare schedules in biweekly vs semimonthly pay, and the rest of the paycheck tools turn any rate-and-hours question into a number.