Weeks to months converter

Weeks to months chart

Months to weeks chart

Worked example

How many months is 12 weeks? First turn weeks into days: 12 × 7 = 84 days. Then divide by the average month: 84 ÷ 30.44 = 2.76 months. So 12 weeks is about two and three-quarter months, a little short of three. Going the other way, 3 months × 30.44 = 91.3 days, and 91.3 ÷ 7 = 13.04 weeks.

12 weeks in months: where the number comes up

12 weeks in months is 2.76, and that small gap from 3 matters more than it looks. A 12-week course or training plan finishes about a week before the same date three months later. Pregnancy week 12, the end of the first trimester, is usually described as the third month. Twelve weeks of family leave under the federal Family and Medical Leave Act is 84 days, not a full quarter. Use months for a rough picture and the exact 84 days whenever a date has to be right.

How it's calculated

• Weeks to months = weeks × 7 ÷ 30.436875
• Months to weeks = months × 30.436875 ÷ 7 (about 4.35 weeks per month)
• Years = days ÷ 365.2425

30.436875 is the average month in the Gregorian calendar: 365.2425 days a year (counting leap years) divided by 12. The U.S. Naval Observatory explains the calendar's leap-year rule in its introduction to calendars, and NIST's A Walk Through Time covers how the Gregorian calendar settled on 365.2425 days. Individual months run 28 to 31 days, so for a specific date range, count the real calendar days.

When weeks and months don't line up

The gap matters most with money. If you're paid every two weeks, you get 26 paychecks a year, not 24, which means two months each year have three paydays. Our biweekly budget guide shows how to plan for those, and a paycheck budget planner keeps each check's bills straight. For family schedules, a monthly calendar or our free calendar with holidays makes the week-to-month math visible.

Babies grow by the week

Track the weeks that matter

Babies are measured in weeks long before months. The Newborn Baby Tracker keeps daily logs, feeding, diapers, sleep, growth and checkup notes together so you can answer the pediatrician's questions.

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• Feeding, diaper and sleep pages
• Growth and pediatrician-visit pages

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Need hours instead of weeks? The time calculator adds and subtracts hours and minutes.

Questions, answered

How many months is 12 weeks? 12 weeks is about 2.76 months, which most people round to just under 3 months. That's 84 days divided by 30.44, the average number of days in a month. If you count calendar months from a start date, 12 weeks usually ends a few days before the 3-month mark.

Is 12 weeks the same as 3 months? Not quite. 12 weeks is 84 days, and 3 calendar months is 89 to 92 days depending on which months you count. So 12 weeks in months is about 2.76, roughly 5 to 8 days short of a full 3 months. It's fine to say 'about 3 months' in conversation, but use the exact 84 days for deadlines, leave dates or medication schedules.

How many days and hours are in 12 weeks? 12 weeks is 84 days, 2,016 hours or 120,960 minutes. That's 12 × 7 = 84 days, then 84 × 24 = 2,016 hours. In working days, 12 weeks is usually 60 weekdays (Monday to Friday), before you take out any holidays.

What date is 12 weeks from a given day? Add 84 days to the start date. For example, 12 weeks after January 1 is March 26 in a regular year, or March 25 in a leap year, because February has an extra day. Twelve weeks always lands on the same weekday you started on, so a Monday start ends on a Monday.

Is 12 weeks of FMLA leave about 3 months? The Family and Medical Leave Act allows eligible employees up to 12 workweeks of unpaid, job-protected leave in a 12-month period, according to the U.S. Department of Labor. Twelve weeks converts to about 2.76 months, so it is close to, but a few days shorter than, 3 calendar months. Your employer's policy and state law decide the exact dates.

How do you convert weeks to months? Multiply the number of weeks by 7 to get days, then divide by 30.44, the average length of a month. A shortcut is to divide the weeks by 4.35. For example, 20 weeks × 7 = 140 days, and 140 ÷ 30.44 = 4.6 months.

How many weeks are in a month? An average month has 4.35 weeks, or about 4 weeks and 2 to 3 days. Only February in a non-leap year is exactly 4 weeks. A 30-day month is 4 weeks and 2 days, and a 31-day month is 4 weeks and 3 days.

Why isn't a month just 4 weeks? Because 4 weeks is only 28 days, and every month except February has 30 or 31 days. If you treat a month as 4 weeks, you'll be off by about 2.4 days a month, which adds up to a whole extra month every year: 52 weeks ÷ 4 = 13 'months'.

How many months is 40 weeks of pregnancy? 40 weeks is 280 days, which is about 9.2 average months. That's why a full-term pregnancy is described as 'nine months' even though it runs a little longer. Pregnancy is counted in weeks from the first day of the last period, so ask your doctor or midwife how they're counting for your due date.

How many weeks is 6 months? 6 months is about 26.1 weeks, or 26 weeks and 1 day on average. Half a year is 182 or 183 days, depending on which months you count and whether it's a leap year.

How many weeks are in a year? There are 52 weeks and 1 day in a regular year, and 52 weeks and 2 days in a leap year. 52 weeks is 364 days, which is 11.96 months, just shy of a full year.

What number does the converter use for a month? It uses 30.436875 days, the average month in the Gregorian calendar (365.2425 days ÷ 12). That gives the most accurate long-run answer. For a specific stretch of time, such as a lease or a baby's age, counting real calendar dates is more exact, which you can do with the date box on our weeks left in the year page.

How many months is 26 weeks? 26 weeks is about 5.98 months, which is essentially 6 months or half a year. 26 weeks is also the number of biweekly paychecks in most years, which is why a biweekly paycheck is not the same as a twice-a-month paycheck.

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