Weeks to hours:
multiply by 168

How many hours are in a week?

There are 168 hours in one week. A week has 7 days and each day has 24 hours, so 7 × 24 = 168. This is a fixed figure, so weeks to hours is a simple multiplication.

People ask this when they plan how to split time. Of the 168 hours, a standard 40-hour job covers about a quarter, and eight hours of sleep per night uses 56. The rest is time for travel, meals, family and everything else.

The weeks to hours formula

If you remember that 168 is close to 170, you can estimate quickly: 6 weeks is about 6 × 170 = 1,020 hours, only 12 off the exact number.

Weeks to hours conversion chart

For 52 weeks, the full year before leap days, the total is 8,736 hours. A year of 365 days has 8,760 hours, so the 52-week figure is 24 hours short.

Going the other way: hours to weeks

To turn hours into weeks, divide by 168. A 720-hour month-long rental is 720 ÷ 168 = about 4.29 weeks, or four weeks and two days. A 1,000-hour training target is 1,000 × 0.005952380952 = about 5.95 weeks of non-stop time.

Working hours behave differently. A full-time 40-hour week over 52 weeks is 2,080 working hours, so a 2,080-hour budget is one full-time person for a year. Do not use 168 for work time: it counts every hour, awake or not.

More weeks to hours examples

Project managers use this conversion constantly. A 12-week software sprint plan is 12 × 168 = 2,016 calendar hours, and a 13-week quarter is 2,184 hours. Half a year of 26 weeks is 4,368 hours. Use these for server uptime, rental periods or warranty windows, which run on calendar time.

Uptime targets make a second worked example. A service promising 99.9 percent availability can be down for 0.1 percent of a week. That is 168 × 0.001 = 0.168 hours, or about 10.08 minutes. A 2.5-week hire is 2.5 × 168 = 420 hours.

One caution: in places that change their clocks, the week in which the clocks move has 167 or 169 local hours, not 168. This rarely matters for planning, but it can for hourly billing. A sanity check for any answer is to multiply weeks by 7 and then by 24, which should land on the same figure.

Work weeks, courses and the length of a year

A 40-hour work week fills 40 of the 168 hours in a week, which is 23.8 percent. A 12-week project spans 2,016 hours of calendar time.

Fifty-two weeks equal 8,736 hours, which is 24 fewer than the 8,760 hours in a 365-day year, because 52 weeks is only 364 days. Remember that gap when you convert a full year of weeks.

Common mistakes when converting weeks to hours

• Using 24 × 5 = 120 because only weekdays come to mind. A week has seven days, so use 168.
• Forgetting the reverse direction. Hours into weeks needs division, so 336 hours is 2 weeks, not 56,448.
• Treating a month as exactly four weeks. A 30-day month is 4.29 weeks, or 720 hours.
• Mixing calendar hours with billable or working hours when pricing projects.