How Overtime Hours Are Calculated
Overtime counting starts with a threshold — most often 40 hours in one workweek — and everything past it is counted separately from regular hours. Which threshold applies to you, and what the extra hours pay, depends on where and how you work.
The weekly rule (the US federal baseline)
The Fair Labor Standards Act (FLSA) sets the baseline for many US employees: hours worked past 40 in a single workweek are overtime, paid at no less than one and a half times the regular rate. Three details do the real work in that sentence. A workweek is a fixed 168-hour period your employer defines — it need not start on Monday, but it cannot be reshuffled week to week to dodge the threshold. Hours are counted per week, never averaged across a two-week pay period: 50 hours one week and 30 the next is 10 overtime hours, not zero. And the rule covers non-exempt employees; salaried exempt staff — many managers, professionals and administrators meeting the legal tests — are generally outside it.
Daily rules, where they exist
Some states layer a daily count on top of the weekly one. California is the standard example: generally, hours past 8 in a day are overtime and hours past 12 are double time, alongside the weekly 40-hour rule, with the employee getting whichever treatment is better for each hour — never both for the same hour. A 10-hour Monday in California is 8 regular + 2 overtime hours even in a short week. Alaska, Colorado and Nevada have their own daily provisions with their own thresholds and exceptions. Most states have no daily rule at all.
A worked week, both ways
| Schedule | Total | Weekly rule | With CA-style daily rule |
|---|---|---|---|
| Mon–Fri, 8 h/day | 40 | 40 reg + 0 OT | 40 reg + 0 OT |
| Mon–Fri, 9 h/day | 45 | 40 reg + 5 OT | 40 reg + 5 OT (1/day) |
| Mon–Thu, 10 h/day | 40 | 40 reg + 0 OT | 32 reg + 8 OT (2/day) |
| Mon–Sat, 8 h/day | 48 | 40 reg + 8 OT | 40 reg + 8 OT |
The third row is why the daily rule matters: the same 40 hours, worked as four long days, contain 8 overtime hours under a daily rule and none under the weekly rule alone. (Alternative-workweek arrangements can change even this in California — another reason the table is an illustration, not a ruling.)
What this page cannot tell you
Whether you are owed overtime turns on your classification, your state or country, your industry (healthcare, transport and public safety carry special rules), and any union or contract terms — most of which beat the statutory floor when they are more generous. Outside the US the whole framework changes: the EU Working Time Directive caps the week itself, for instance. Treat everything here as orientation for reading your own timesheet — the time card will happily split your week at 40 — and take disputes to your payroll department or a local employment adviser, not to a calculator.
Frequently asked questions
- Is overtime always time-and-a-half?
- Under the FLSA baseline, at least 1.5× the regular rate for the overtime hours. Double time (2×) exists in specific state rules — California past 12 hours in a day is the well-known case — and in many contracts, but it is not the federal default.
- Do weekends or holidays automatically count as overtime?
- Not under the federal rule: only the hour count matters, so a Saturday shift inside a 35-hour week is regular time unless a state rule or your contract says otherwise. It feels wrong to many people; it is nonetheless how the weekly rule works.
- Can my employer average my hours over two weeks?
- For FLSA overtime, generally no — each workweek stands alone, with narrow exceptions (certain hospital and public-safety schedules). A 50/30 split across a pay period still contains 10 overtime hours in the first week.
- Do breaks change the overtime count?
- Only hours actually worked count toward 40. Unpaid meal breaks off duty do not count; short paid rest breaks do. That is why the break column on the time card matters at the margin of a 40-hour week.