How many weeks are in a month?

Calendar months vary (28 to 31 days), so there is no single answer. This tool uses the average Gregorian month — 365.2425 ÷ 12 = 30.436875 days, which is about 4.3481 weeks per month.

Why is the result not a whole number?

Because a month is not an exact number of weeks. One month averages roughly 4.35 weeks, so 3 months is about 13.04 weeks rather than a round figure.

How many weeks is 3 months?

3 × 4.348125 = 13.04 weeks. People often say '13 weeks' for a quarter, which is very close to the exact average.

How many weeks is 9 months of pregnancy?

Using the average month, 9 months ≈ 39.1 weeks. Pregnancy is usually tracked as 40 weeks, which is why '9 months' is an approximation rather than an exact match.

How do I convert weeks back to months?

Divide by 4.348125. For example, 26 weeks ÷ 4.348125 ≈ 5.98 months. Press Swap and the tool does this automatically.

Is my input uploaded anywhere?

No — the conversion runs entirely in your browser and nothing is sent over the network.

Months to Weeks Converter

This converter changes months into weeks and back again. Because a calendar month has no fixed number of weeks, it uses the long-term average month so results are consistent and reproducible.

How it works

The tool uses the average Gregorian month: a year of 365.2425 days divided by 12 gives 30.436875 days per month, and dividing by 7 gives the weekly figure:

weeks = months × 4.348125
months = weeks ÷ 4.348125

Press Swap to reverse the direction. Since real months range from 28 to 31 days, treat the result as an accurate average rather than an exact count for a specific calendar month.

Example

A 6-month project timeline in weeks:

6 × 4.348125 = 26.09 weeks, so roughly 26 weeks.

Months	Weeks (approx.)
1	4.35
3	13.04
6	26.09
9	39.13
12	52.18

Everything is calculated locally in your browser.