Weeks to Years (wk to yr)

How to convert weeks to years

Divide the weeks by 52.1775:

years = weeks ÷ 52.1775

78 wk ÷ 52.1775 = 1.495 years. The divisor comes from the average length of a year in the Gregorian calendar: 365.2425 days (97 leap years in every 400), divided by 7 days. The result also shows the same span in months (a twelfth of an average year, 30.44 days) and days. To go the other way, multiply years by 52.1775, or type the years into the second field.

Is 52 weeks a year?

Not exactly. 52 weeks × 7 = 364 days, while a calendar year has 365 days, or 366 in a leap year. That is why dividing by 52 slightly overstates the years:

The missing day or two accumulates: every 5 or 6 years the calendar has a year with 53 ISO weeks, and payroll calendars with weekly pay get a 53rd payday. For contracts and planning, count days with the days between dates calculator.

Weeks to years chart

Durations people count in weeks

Some periods are naturally counted in weeks and then quoted in years. A baby’s age is tracked in weeks for the first months; at 78 weeks the child is about a year and a half. Employment law and benefit rules often use weeks: 52 weeks of service is commonly treated as a year, even though it is a day or two short. Training plans, academic terms and project roadmaps are written as 12-, 16- or 26-week blocks, and 156 weeks is a three-year degree or warranty. In each case, divide by 52.1775 for the exact share of a year, and read the months line when a rounder figure is easier to talk about.

Weeks, months and dates

A month is not 4 weeks: it averages 4.35 weeks, so 13 weeks is about 3 months (a quarter) and 26 weeks about 6 months. To find the date a number of weeks from today — a due date, the end of a 12-week program — use the date calculator. To convert a list of durations at once, open Convert a list of values and paste the weeks one per line. For hours worked over several weeks, see the hours calculator.