Guide

Is overtime calculated weekly or biweekly? The 40 vs 80 hour rule

Updated October 24, 2026

If you’re paid every two weeks, it’s natural to expect overtime after 80 hours in the pay period. Under US federal rules, that isn’t how overtime is counted. Here’s how it works, with two worked examples and a checklist for your pay stub.

This guide describes the US federal rules. Your state, an employment or union agreement, or your employer’s policy can add to them, and whether the federal overtime rules cover a particular job depends on the job and the employer. Use it to understand the numbers on your pay stub, not as legal advice.

The federal rule: 40 hours in a workweek

The FLSA requires covered, non-exempt employees to receive overtime pay of at least one and a half times their regular rate of pay for hours worked over 40 in a workweek. The unit is the workweek, not the pay period, the month or the calendar week.

How often you’re paid is a separate question. The Department of Labor’s regulation says the single-workweek standard applies whether an employee is paid on a daily, weekly, biweekly, monthly or other basis. So a biweekly paycheck usually contains two workweeks, and overtime is worked out for each of them separately.

A workweek isn’t the same as a pay period

A workweek is a fixed and regularly recurring period of 168 hours: seven consecutive 24-hour periods. A pay period is the stretch of time a paycheck covers. The two often line up, but they don’t have to.

A biweekly pay period is 14 days, so it usually holds exactly two workweeks when both start on the same day. A twice-a-month (semimonthly) pay period, such as the 1st to the 15th, doesn’t contain a whole number of weeks, so some workweeks always cross from one pay period into the next.

Why your workweek may not start on Monday

Under 29 CFR 778.105, a workweek doesn’t have to match the calendar week. It may begin on any day and at any hour, and an employer can set one workweek for a whole workplace or different workweeks for different employees or groups. An employer might choose, for example, a Sunday start, or a start at a time of day when no shift is usually running.

Once it’s set, the start is fixed: it doesn’t move around with the hours you happen to work. It can be changed only if the change is meant to be permanent and isn’t designed to avoid the overtime requirements.

Your pay stub may not show when your workweek starts. Your employee handbook, your timekeeping system’s weekly totals or your payroll team can tell you. You need it before you can split your hours correctly.

Hours generally can’t be averaged between workweeks

The regulation is titled “Each workweek stands alone” (29 CFR 778.104). It says the FLSA takes a single workweek as its standard and doesn’t permit averaging hours over two or more weeks. Its own example is an employee who works 30 hours one week and 50 the next: overtime is due for the hours over 40 in the second week, even though the two weeks average 40 hours.

In practice, that means a short week doesn’t cancel out a long one, even when both are on the same paycheck.

Worked example 1: 45 hours, then 35 hours

Alex earns $20.00 an hour and is paid every two weeks. The pay period is made up of two complete workweeks. Alex works 45 hours in week 1 and 35 hours in week 2: 80 hours in total.

The example uses simple assumptions: the regular rate is the $20.00 hourly rate (no bonuses, shift differentials or other pay that could raise it), overtime is paid at 1.5 times that rate ($30.00 an hour) for hours over 40 in a workweek, and no state daily overtime applies.

Week 1 is 40 hours × $20.00 = $800.00 plus 5 overtime hours × $30.00 = $150.00, so $950.00. Week 2 is 35 hours × $20.00 = $700.00, with no overtime.

If the two weeks were averaged instead, the pay period would look like 80 hours at 40 hours a week, with no overtime at all:

Both methods pay all 80 hours at $20.00, which is $1,600.00. What averaging misses is the overtime premium: the extra half of the rate on the 5 hours over 40 in week 1.

To check your own weeks, enter each workweek separately in the overtime pay calculator, then add the two results.

Worked example 2: a workweek that crosses two pay periods

Jordan earns $20.00 an hour and is paid twice a month. In this example the pay periods are October 1–15, 2026, paid on Tuesday, October 20, and October 16–31, paid on Thursday, November 5. Jordan’s employer has set the workweek to run from Sunday at 12:00 a.m. to the end of Saturday. The paydays here are illustrative; yours are on your own pay schedule.

The workweek of Sunday, October 11 to Saturday, October 17 starts in the first pay period and ends in the second:

Jordan didn’t work on Sunday, October 11 or Saturday, October 17. The workweek has 8 overtime hours, but when the first pay period closes on October 15, Jordan has worked only 40 hours in that week. The week doesn’t end until October 17, in the second pay period.

The total matches the per-workweek calculation: 40 hours × $20.00 + 8 hours × $30.00 = $1,040.00. If Jordan compares only the October 20 paycheck with the hours worked October 1–15, no overtime for this week shows on it, and that alone doesn’t mean overtime is missing. Under the general federal timing rule described below, overtime earned in this workweek would be due on the regular payday for the period in which the week ends: here, November 5.

A biweekly schedule can split workweeks too: for example, if the pay period runs Wednesday to Tuesday but the workweek runs Sunday to Saturday.

When overtime is generally paid

The federal regulation on the timing of overtime payment, 29 CFR 778.106, says:

• The FLSA doesn’t require overtime to be paid weekly.
• The general rule is that overtime earned in a particular workweek must be paid on the regular payday for the period in which that workweek ends.
• When the correct amount of overtime can’t be determined until some time after the regular pay period, the requirement is met if the employer pays it as soon after the regular pay period as is practicable. Payment can’t be delayed longer than is reasonably necessary to compute and arrange it, and never beyond the next payday after the computation can be made.
• Overtime on a retroactive pay raise is due when the raise is paid.

The Department of Labor’s Fact Sheet #23 puts it more briefly: normally, overtime pay earned in a particular workweek must be paid on the regular payday for the pay period in which the wages were earned. States have their own laws about paydays, which this guide doesn’t cover.

Exceptions and other rules

Hospitals and residential care: the “8 and 80” system

Section 7(j) of the FLSA lets hospitals and residential care establishments use a fixed, recurring 14-day work period instead of the 40-hour workweek for computing overtime, but only under an agreement or understanding with the employee made before the work is done. Overtime is then due at time and a half for hours over 8 in a workday and over 80 in the 14-day period. This is where an “80 hours” threshold appears in the federal rules, and even then the 8-hour daily threshold applies as well. It’s available only to those employers, and only with that prior agreement; being paid every two weeks doesn’t create it.

Exempt employees

The overtime requirement applies to covered employees who aren’t exempt. Some employees are exempt from overtime, for example certain executive, administrative and professional employees who meet both job-duty tests and salary requirements. Job titles alone don’t decide this, and the rules are detailed; Fact Sheet #17A explains them. Other exemptions exist for particular industries and jobs.

State rules and agreements

States can set more protective overtime rules than the FLSA. The Department of Labor says that where an employee is subject to both state and federal overtime laws, the employee is entitled to overtime according to the higher standard. California, for example, generally requires overtime for hours over 8 in a workday as well as over 40 in a workweek, with double time after 12 hours in a workday. An employment contract or union agreement can also provide overtime earlier or at a higher rate than the law requires. Check your state labor department for the rules where you work.

The regular rate can be higher than your hourly rate

Overtime is based on the “regular rate” of pay, which can include some other pay, such as certain bonuses and shift differentials. If you receive them, the overtime on your stub may be more than 1.5 times your base hourly rate. The examples above leave this out.

Pay stub checklist

1. Find the pay period dates printed on the stub, and the payday.
2. Find your workweek start: the day and hour your employer’s workweek begins. Ask payroll if it isn’t written down.
3. Split your hours into workweeks, not pay periods. Note any workweek that starts in one pay period and ends in the next.
4. Count the overtime for each workweek: hours over 40, plus any daily overtime your state or agreement adds.
5. Compare the hours lines: regular hours and overtime hours on the stub against your own totals for the workweeks that end in this pay period.
6. Look for split weeks on the next stub: overtime from a week that ended after the period closed may appear on the next paycheck.
7. Check the overtime rate: at least 1.5 times your regular rate, which may be higher than your base rate if bonuses or differentials apply.
8. Compare gross pay, before taxes and deductions, not take-home pay.
9. Write down any difference with the dates, your times and the line that differs, and ask your payroll team.

Check your own numbers

• Total each workweek’s shifts, minus unpaid breaks, with the work hours calculator.
• Work out each week’s regular and overtime pay with the overtime pay calculator, one workweek at a time.
• Compare the result with your paycheck, line by line, using the paycheck difference calculator.
• For the full walkthrough, read how to check your paycheck against your hours. If your employer rounds punches, see timecard rounding explained.

The calculators show arithmetic from the numbers you enter. They don’t decide whether overtime law covers you, which rules apply or what anyone is legally owed.

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