Hours to Week Conversion

How to use the Hours to Week Conversion#

1. Enter the hours. Type the number of hours.
2. Set your working week. Use 40 hours, or your own contract.
3. Read the weeks. You get calendar weeks and working weeks.

The formulas#

A week has 7 × 24 = 168 hours. 400 hours is 2.38 calendar weeks. For a 40-hour working week, 400 hours is 10 working weeks.

Which one to use#

Calendar weeks suit things that run around the clock, like a machine, a server or a download. Working weeks suit staffing, project estimates and freelance quotes. If a job takes 400 hours and one person works 40 a week, it takes ten weeks. If two people share it, it takes five.

Related#

To work in smaller units, use the minutes to hours converter.

Worked examples#

Here are a few common totals, shown as calendar weeks and as 40-hour working weeks.

A project quote of 1,000 hours is about 25 full-time weeks, which is roughly six months for one person. Part-time staff work fewer hours a week, so change the working week above to get a fair answer for them.

A week has 168 hours, a working week has fewer#

A calendar week is 7 × 24 = 168 hours. A working week is the part of it you are paid for or expected to work, and it differs by country and by job. Many full-time contracts use 40 hours, but 35, 37.5, 44 and 48 are common too. The European Union’s Working Time Directive sets an average ceiling of 48 hours a week, and the federal civil service in Nigeria runs on a 40-hour week.

That is why the calculator gives two answers: calendar weeks, which divide by 168, and working weeks, which divide by the figure you enter.

Planning with hours instead of dates#

When a project is measured in hours, convert it to weeks before you promise a deadline. Add a buffer for meetings, sickness and public holidays, which can take 10 to 20 percent of the time. If a job needs 200 hours and you work 40 hours a week, that is 5 weeks of work, but realistically 6 on the calendar.

The calculator also gives the number of days and the average number of months, using 730.5 hours per month, which is 8,766 hours in a year divided by 12. Use that for a rough estimate. If you need exact working days between two dates, use the days between dates calculator.

Hours, pay and full-time equivalents#

A full-time year of 52 weeks at 40 hours is 2,080 hours, and employers use that figure to turn annual pay into hourly pay. A salary of ₦3,600,000 a year is ₦3,600,000 ÷ 2,080 = ₦1,730.77 an hour. A part-time worker on 25 hours a week is 25 ÷ 40 = 0.625 of a full-time equivalent, and a contract that pays a pro-rata salary would pay 62.5 percent of the full-time figure.

Leave works the same way. If a contract gives 20 days of annual leave and a standard day is 8 hours, that is 160 hours, or 4 working weeks. When you work out a project budget, remember to subtract that time from the year before dividing.

A rule of thumb for planning#

Not all of a working week is productive. Meetings, email, breaks and interruptions often take a third or more, so a 40-hour week might hold only 25 to 30 hours of focused work. If a task needs 90 focused hours, plan for around three working weeks, not two and a quarter. Use the calculator to convert, then add a buffer. For deadlines in days, the days between dates calculator counts working days directly.

Counting study or practice hours#

If a qualification asks for 300 guided learning hours, that is 7.5 working weeks at 40 hours, or 30 weeks at 10 hours a week. Break the total into a weekly goal to see if it fits your life. If you study 6 hours a week and need 300, the finish date is 50 weeks away. The calculator shows weeks and days to help you pick a realistic deadline.

Last reviewed October 2026 by the Calclulo team.