Convert any number of months to weeks. Add a start date for the exact span — real month lengths and leap days — or leave it blank for the 30.44-day average.
34.8 weeks
8 months is 34 weeks and 6 days · about 243.5 days · average calendar month
34.79
Weeks (avg month)
243.5
Days (average)
34w 6d
Weeks + days
—
End date
Exact for a real date No sign-up
How months convert to weeks
A week is 7 days, and a calendar month averages 30.44 days (365.25 ÷ 12). So the quick formula is months × 30.44 ÷ 7. That is the answer most people want — but it assumes an average month.
Real months are 28 to 31 days long, so an actual run of months rarely matches the average exactly. Enter a start date above and this converter adds whole calendar months to it, counts the real days between the two dates — including 29 February when the span crosses a leap day — and gives the exact weeks and days. That is the part a fixed “N months = X weeks” answer can't do. For a span between two specific dates instead, use the date calculator.
Months to weeks table
Months
Weeks (avg)
Weeks + days
Days (avg)
Based on the average month of 30.44 days. February-heavy spans run slightly shorter; spans with more 31-day months run slightly longer — enter a start date above for the exact figure.
Multiply the number of months by the average calendar month of 30.44 days (365.25 ÷ 12), then divide by 7. For example, 8 months is 8 × 30.44 ÷ 7 = 34.8 weeks. That uses the average month; a real span with a known start date can be a day or two either side, which this converter shows if you enter the start date.
Why does the exact answer differ from the average?
Calendar months are 28 to 31 days long, so a real run of months is rarely exactly the 30.44-day average. Entering a start date lets the converter add whole calendar months to it and count the real days between — including 29 February when the span crosses a leap day — so the exact weeks can be a few days more or less than the average. The leap year checker settles whether a given year adds that extra day.
How many weeks are in 6 months?
About 26.1 weeks on average — 26 weeks and 1 day, roughly 183 days. A real 6-month span runs from about 181 to 184 days depending on which months it covers and whether it includes 29 February, which is 25 weeks 6 days to 26 weeks 2 days. Enter your start date above to convert your own 6-month span exactly.
How many weeks are in 12 months?
About 52.2 weeks — a full common year is exactly 52 weeks and 1 day (365 ÷ 7), and a leap year is 52 weeks and 2 days (366 days). The 30.44-day average gives 52.18 weeks for 12 months. See how many weeks are in a year for the full breakdown.