Does overtime start after 40 hours in a week, or after 8 in a day?
Published August 21, 2026
The short answer
It depends which rule your work runs on, and both exist. Some overtime rules count hours across a whole week; others count them within a single day. The same week of hours can be eight hours of overtime under one and none at all under the other.
Four ten-hour days is the clearest case. That is forty hours. Under a rule that counts a week, forty hours is not past forty, so none of it is overtime. Under a rule that counts a day, every day ran two hours past eight, so eight of those forty hours are overtime. Same person, same week, same forty hours.
Almost everything published online gives the weekly answer and stops there, which is why people who are on a daily rule often never find out. This page does not tell you which one you are on — that depends on your own agreement and where you work, and it is a question for an attorney, a union or the Department of Labor. What it does is show you what your week looks like under the rule you say you are on.
What you can do
- 1
Write down each day, not the week
A weekly total cannot answer a daily rule. The days can answer both.
- 2
Find what you were told
Offer letter, contract, handbook, noticeboard. Keep a copy while you can still get one.
- 3
Write the deal down as you understand it
After how many hours, in a day or in a week, and at what multiple. All three, or it can't be applied.
- 4
Check the week against your own rule
Not against a rule from the internet. Yours.
- 5
Take it somewhere that can rule on it
The Department of Labor, your state labor department, a union or an attorney. A record makes that conversation short.
Where the exact rules matter: the specifics — figures, thresholds, deadlines, and which rules apply — vary by state and by your situation. Check them with the U.S. Department of Labor (dol.gov) or your state labor department rather than relying on a number from anywhere else.
In plain terms
- Threshold
- The number of hours past which overtime starts. Useless on its own — 40 means one thing in a week and something quite different in a day.
- Basis
- Whether the threshold counts a day or a week. The same number with a different basis is a different deal.
- Multiplier
- What overtime is paid at, as a multiple of your ordinary rate — 1.5× is common, and it is not the only answer.
- Premium
- The extra on top of ordinary pay for the overtime hours, rather than the whole amount for those hours.
Where rippedoffworker comes in
The guide tells you what to do — the app does it with you.
rippedoffworker helps you log the hours, pay, and treatment as they happen and builds a dated record over time — so what your hours came to against what you were paid, as your own estimate, and the pattern behind it are organized in one place, ready to take to the people who can help.
rippedoffworker is a record-keeping tool, not a law firm, and does not give legal advice. Any amounts are arithmetic on the figures you entered — apparent, not a guaranteed or legally determined amount.
How can forty hours be overtime and not overtime at the same time?
Because the two rules measure different things. A weekly rule adds up the hours in the week and looks at the total. A daily rule looks at each day on its own and asks how far past the day's limit it ran.
A week of four ten-hour days totals forty. A weekly rule counting to forty finds nothing past it. A daily rule counting to eight finds two hours past on each of four days. Neither is doing anything odd — they are just counting different things, and nothing about the total tells you which was meant.
Why does almost everything online only mention the weekly rule?
Because it is the more common one, and it is the one federal law is written around. A page that says “overtime is time and a half after forty hours” is not wrong for most people — it is just silent about the rest, and silence reads as completeness.
The people it fails are the ones working long days and short weeks. Four tens, three twelves, two sixteens: those weeks are exactly where a daily rule makes a difference and a weekly one makes none, and they are common in shift work, healthcare and hospitality.
How do I find out which rule applies to me?
Start with what you were told and what you were given. An offer letter, a contract, a staff handbook or a policy on a noticeboard will often say what the deal is, and that is the thing worth keeping a copy of before you need it.
Where it applies by law rather than by agreement, it varies by state and by the kind of work — a handful of states run a daily rule as well as a weekly one, and some agreements are better than whatever the floor is. We do not decide that here, and neither should any tool. The Department of Labor, your state labor department, a union or an attorney are the places that can tell you.
What should I write down in the meantime?
The days. Not the weekly total — the days. A total cannot answer a daily rule: forty hours could be four tens or five eights, and those are two different weeks under a daily rule and the same week under a weekly one.
Once the days are written down, the answer under either rule is arithmetic. Written down only as weekly totals, half the question is gone and cannot be got back.
Does the multiplier matter as well?
Yes, and it is worth stating rather than assuming. Time and a half is common; some agreements pay double time past a further point, and some pay a flat premium instead.
The check below asks for it rather than filling it in, for the same reason it asks for the threshold: a number we chose for you is not your deal, and it would be our figure wearing your name.
One week of four ten-hour days, under each rule
| Counted by the week | Counted by the day | |
|---|---|---|
| The week | 40 hours | 40 hours |
| The threshold | 40 in a week | 8 in a day |
| Hours past it | 0 | 8 — two on each of four days |
| Ordinary hours | 40 | 32 |
| At $20/hr, the extra on top | $0.00 | $80.00 at 1.5× |
Same person, same week, same forty hours. The difference is entirely which rule is being counted against, which is why the check asks you rather than choosing. The $80.00 is the premium on top of ordinary pay — 8 hours × $20 × 0.5 — not the total for those hours.
Check it against your own week
Put one week in day by day and tell us your own rule — after how many hours, in a day or a week, and at what multiple. We won’t pick one for you.
Check my weekFree, no account needed. Private to you — nobody is contacted or notified.