How many months is 12 weeks?

12 × 7 ÷ 30.4375 ≈ 2.76 months — often rounded to about 3 months in pregnancy tracking.

How many weeks is 6 months?

6 × 30.4375 ÷ 7 ≈ 26.07 weeks — often cited as 26 weeks.

Why is the answer approximate?

Calendar months have different lengths (28-31 days), so the conversion uses an average. For exact date calculations, count actual calendar days.

Weeks to Months Converter

Convert weeks to months for project planning, pregnancy tracking, subscription billing, and long-term scheduling. This conversion uses an average month length since calendar months vary from 28 to 31 days.

Formula

Multiply weeks by 7 days/week and divide by 30.4375 days/month (average) to get months. Alternatively, divide weeks by 4.348 to get approximate months.

Quick reference

Week (wk)	Month (mo)
1	0.2299795
2	0.4599589
4	0.9199179
6	1.379877
8	1.839836
12	2.759754
16	3.679671
20	4.599589
26	5.979466
52	11.95893

About these units

Week

The week (7 days) has been in use since ancient Mesopotamia and was tied to the lunar cycle. The 7-day week spread globally through Roman, Hebrew, and Christian traditions.

Month

The month originated as a lunar cycle (approximately 29.5 days), resulting in calendar months of 28-31 days. The average Gregorian month is 365.2425 ÷ 12 ≈ 30.4375 days.

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