Weeks to Months Calculator
Convert a duration in weeks to months using the average Gregorian calendar month length.
About the Weeks to Months Calculator
A month doesn't have a fixed number of weeks — it can run from 4 to nearly 4.5 weeks long depending on the month and year. This calculator uses the average Gregorian calendar month length (based on the 365.2425-day average year) so that repeated conversions stay consistent over long spans of time.
Formula: Months = Weeks ÷ 4.348125, since the average month is 4.348125 weeks long (365.2425 ÷ 7 ÷ 12)
For example, 52 weeks converts to approximately 11.96 months — just under a full year, since 52 weeks is actually a few days shorter than 365.25 days.
Useful for pregnancy timelines, project schedules, loan and lease terms, and any situation where a duration is tracked in weeks but needs to be compared against a monthly figure.