In 1 weeks there are 0.233333 months. Meanwhile in 1 months there are 4.285714 weeks. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Months to Weeks calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert weeks to months, use the average number of weeks in a month.
This gives a more accurate weeks-to-months conversion than using 4 weeks per month, since real months range from 28 to 31 days.
Quick examples
Tip: Round the result to the decimal places you need (like 1.8 months or 1.84 months).
A week isn’t a fixed number of months because months have different lengths. On average, 1 week is about 0.23 months. That estimate uses the average month length in a year.
The number of weeks in a month changes by month. Most months have 4 weeks plus extra days. In general, a month is about 4.35 weeks on average.
Weeks are always 7 days. Months can have 28, 29, 30, or 31 days. Since the month length changes, the weeks-to-months result changes too.
Use days as the bridge. Convert weeks to days first (weeks × 7), then divide by the number of days in the target month. This gives the best match for a specific calendar month.
A common average uses a 365-day year:
Four weeks is 28 days. That equals:
Eight weeks is 56 days. That equals:
Twelve weeks is 84 days. That equals:
No. Only a 28-day month is exactly 4 weeks. Most months are longer, so they run past 4 weeks by 2 or 3 days.
It depends on which two months you mean. Using averages, 2 months ≈ 8.69 weeks. For exact results, add the days in those two calendar months and divide by 7.
Leap years add one day to February. That changes February’s length from 28 to 29 days. Conversions tied to February shift a little, but most other months stay the same.
Pregnancy is often tracked in weeks because it’s more precise. For a rough month estimate, divide weeks by 4.35. Example: 20 weeks ≈ 4.6 months. For medical use, weeks are usually the standard.
Pay periods often follow weeks (weekly, biweekly) while budgets follow months. For planning, use the average: monthly amount ≈ weekly amount × 4.35. For exact billing, count the actual pay dates in the month.
Round based on your goal:
For a quick estimate:
Use the average when you don’t need exact calendar dates:
Not always. A “month” can mean a calendar month or a set number of days. A “week” is always 7 days. When the wording matters, use the exact dates or the written definition.
“4 weeks” means 28 days from a start date. “1 month” usually means the same date in the next month (like March 10 to April 10). Those two results can land on different days.
Yes, by using averages. Divide weeks by 4.35 to get months. It’s good for estimates, but it won’t match every calendar month.
The Calculate Box tool to convert weeks to months uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a weeks value in the box and have it instantly converted to months.