Hours to Weeks Converter
Convert hours to weeks — 168 hours in a week, and what a 40-hour week is a fraction of.
Updated
weeks
1.000wk
168 h = 1.000 wk
In short
How many hours are in a week?
Exactly 168 — seven days of 24 hours, with no average or approximation involved. A 40-hour working week is 0.238 of that, and a 48-hour one is 0.286. The 40 and the 48 are contractual and legal figures; only the 168 is a property of the calendar.
The US 40-hour week is an overtime threshold, not a maximum. The UK 48-hour limit is an average over 17 weeks, and workers can opt out of it in writing.
hours to weeks — quick reference
| hours (h) | weeks (wk) |
|---|---|
| 24 h | 0.143 wk |
| 40 h | 0.238 wk |
| 48 h | 0.286 wk |
| 72 h | 0.429 wk |
| 168 h | 1.000 wk |
| 336 h | 2.000 wk |
| 504 h | 3.000 wk |
| 672 h | 4.000 wk |
The formula, worked line by line
Both ratios are exact. A day is 24 hours and a week is 7 days, neither of which is an average or an approximation, so a week is exactly 168 hours and the division introduces no error at all.
“A week is seven days; a day is twenty-four hours. Neither ratio has an exception in civil timekeeping, apart from the two local clock-change days a year.”
The only complication is jurisdictional rather than arithmetic. In places that observe daylight saving, one local day a year is 23 hours and one is 25, which makes those particular weeks 167 and 169 hours long as measured between local midnights.
weeks = hours / 168
168 = 7 x 24
168 h -> 168 / 168 = 1 week
1 week = 168 h = 10,080 min = 604,800 s
working weeks = hours / 40, a contractual figure- Hours entered
- 168
- Hours per week
- 168, exactly
- Division
- 168 / 168 = 1
- Weeks
- 1.000 weeks
No decimal appears at any precision, because both units are whole multiples of the hour. The only way to get a fractional answer is to start with a fractional number of hours, or to be counting a clock-change week.
The two weeks that are not 168 hours
In a jurisdiction observing daylight saving, the week containing the spring change runs 167 hours between local midnights, and the week containing the autumn change runs 169. UTC weeks are unaffected; it is local civil time that stretches and compresses.
- An ordinary week
- 168 h
- The spring-forward week
- 167 h
- The autumn-back week
- 169 h
- Any week measured in UTC
- 168 h, always
Payroll systems that compute hours from local timestamps meet this twice a year. Ones that work in UTC never do.
Say which week you mean
A calendar week is 168 hours and a full-time working week is conventionally 40 in the US or 35 to 40 across much of Europe. Four hundred hours is 2.38 of the first and 10 of the second. Quoting one figure to someone expecting the other is the most common way an estimate gets misread.
How to use the hours to weeks converter
A week is exactly 168 hours: seven days of twenty-four. Both ratios are whole numbers by definition, so this conversion carries no rounding and no average. It is one of the few time conversions with nothing to argue about in the arithmetic.
The argument is over which week. Dividing by 168 answers how much of the calendar something occupied. Dividing by 40 answers how many working weeks it represents. Those are different questions and they give answers nearly four times apart, so it is worth being explicit about which one is wanted.
168 h
One calendar week
7 x 24, exactly
0.238
What 40 hours is, in weeks
a US working week
0.286
What 48 hours is, in weeks
the UK weekly cap
The 168 figure has a use beyond arithmetic: it is the only budget everyone has identically. Time-management writing leans on it for exactly that reason, because a week cannot be extended and a plan that needs 170 hours is not ambitious, it is impossible.
For project estimating the working week is the useful denominator, and it is worth stating. Four hundred hours of work is 2.38 calendar weeks and 10 working weeks at 40 hours, and quoting the first to someone expecting the second is how estimates get badly misread.
- 40 h
- 0.238 calendar weeks, 1 working week
- 80 h
- 0.476 calendar weeks, 2 working weeks
- 168 h
- 1 calendar week
- 336 h
- 2 calendar weeks, 8.4 working weeks
- 672 h
- 4 calendar weeks
- 8,760 h
- 52.143 weeks, a 365-day year
The gap between the two columns is the whole reason to say which week you mean. A calendar week is 4.2 times a 40-hour one.
Counting only the working days
A span in calendar weeks includes weekends and holidays. That page counts the actual working days between two dates, which is usually what a delivery estimate needs.
Open the working days calculator →Hours converted to calendar weeks, with the equivalent in 40-hour working weeks alongside. The two columns answer different questions and are 4.2 times apart.
| Hours | Calendar weeks | At 40 h a week |
|---|---|---|
| 24 h | 0.143 weeks | 0.6 weeks |
| 40 h | 0.238 weeks | 1 week |
| 48 h | 0.286 weeks | 1.2 weeks |
| 72 h | 0.429 weeks | 1.8 weeks |
| 100 h | 0.595 weeks | 2.5 weeks |
| 168 h | 1.000 weeks | 4.2 weeks |
| 200 h | 1.190 weeks | 5 weeks |
| 336 h | 2.000 weeks | 8.4 weeks |
| 500 h | 2.976 weeks | 12.5 weeks |
| 504 h | 3.000 weeks | 12.6 weeks |
| 672 h | 4.000 weeks | 16.8 weeks |
| 1,000 h | 5.952 weeks | 25 weeks |
| 8,760 h | 52.143 weeks | 219 weeks |
The 40 and the 48 are not the same kind of number
Both get quoted as "the working week" and they come from different legal traditions doing different things. The American figure sets a price; the European one sets a limit. Converting hours to weeks without knowing which applies produces a number that looks authoritative and means very little.
Under the Fair Labor Standards Act, covered non-exempt employees must receive at least one and a half times their regular rate for hours over 40 in a workweek. There is no statutory maximum for adults. An employer may lawfully require 60 hours provided the overtime premium is paid.
- Under the FLSA
- lawful; 20 hours paid at 1.5x
- In calendar weeks
- 0.357 of a week
- Under UK Working Time Regulations
- permitted only within a 17-week average
- Or with an individual opt-out
- agreed voluntarily, in writing
- What the conversion cannot tell you
- whether it is allowed
The arithmetic is identical in both places and the consequences are not. A converter can say that 60 hours is 0.357 of a week; it cannot say whether that week was lawful, and this page does not pretend otherwise.
The UK regulation is an average rather than a hard weekly stop. Working time including overtime must not exceed an average of 48 hours per seven days, normally measured over a rolling 17-week reference period. Most adult workers may opt out by voluntary written agreement, which can be ended on notice.
The 168-hour budget
A week does not stretch. Every person gets 168 hours and the only question is allocation, which is why the figure turns up so often in planning advice. It reframes "I do not have time" as a statement about priorities rather than about supply, and the arithmetic is what makes the reframing stick.
A conventional split makes the point. Forty hours of work, fifty-six of sleep at eight a night, and seventy-two remain. That last block is larger than the working one, which is usually the surprise, and it is where commuting, chores, care and everything else actually come from.
- Work, at the US overtime threshold
- 40 h, 23.8 percent
- Sleep, at 8 hours a night
- 56 h, 33.3 percent
- Everything else
- 72 h, 42.9 percent
- Total
- 168 h
Raise the working figure to 60 and the remainder falls to 52 hours, which is where the sense of having no time comes from — it is a real halving of the discretionary block.
The same budget in smaller units is 10,080 minutes or 604,800 seconds. Neither is more useful than the hour figure for planning, but both are worth knowing when a system asks for a week-long interval in a machine unit.
Every hours value, worked out
67 common hours figures each get their own page, with the answer at full precision, the arithmetic, what rounding costs, and the nearest real-world reference point on the scale.
Questions people ask
Sources
Where the constants and formulas on this page come from. Each line names the figure it backs.
The FLSA requires overtime pay of at least one and a half times the regular rate for hours worked over 40 in a workweek, and sets no maximum for adult workers.
Overtime Pay — Fair Labor Standards Act — US Department of Labor, Wage and Hour Division
UK working time including overtime must not exceed an average of 48 hours per seven days, normally over a 17-week reference period, with a voluntary written individual opt-out available.
Working Time Regulations 1998, regulations 4 and 5 — UK Government legislation
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