Pregnancy Weeks to Months Converter
Easily convert your pregnancy weeks into months and trimesters.
Pregnancy Weeks to Months Converter
Pregnancy Weeks to Months Chart (Weeks 1–42)
| Weeks pregnant | Months pregnant | Trimester |
|---|---|---|
| 1 | 1 week | First trimester |
| 2 | 2 weeks | First trimester |
| 3 | 3 weeks | First trimester |
| 4 | 1 month | First trimester |
| 5 | 1 month and 1 week | First trimester |
| 6 | 1 month and 2 weeks | First trimester |
| 7 | 1 month and 3 weeks | First trimester |
| 8 | 2 months | First trimester |
| 9 | 2 months | First trimester |
| 10 | 2 months and 1 week | First trimester |
| 11 | 2 months and 2 weeks | First trimester |
| 12 | 2 months and 3 weeks | First trimester |
| 13 | 3 months | First trimester |
| 14 | 3 months and 1 week | Second trimester |
| 15 | 3 months and 2 weeks | Second trimester |
| 16 | 3 months and 3 weeks | Second trimester |
| 17 | 4 months | Second trimester |
| 18 | 4 months and 1 week | Second trimester |
| 19 | 4 months and 2 weeks | Second trimester |
| 20 | 4 months and 3 weeks | Second trimester |
| 21 | 5 months | Second trimester |
| 22 | 5 months | Second trimester |
| 23 | 5 months and 1 week | Second trimester |
| 24 | 5 months and 2 weeks | Second trimester |
| 25 | 5 months and 3 weeks | Second trimester |
| 26 | 6 months | Second trimester |
| 27 | 6 months and 1 week | Second trimester |
| 28 | 6 months and 2 weeks | Third trimester |
| 29 | 6 months and 3 weeks | Third trimester |
| 30 | 7 months | Third trimester |
| 31 | 7 months and 1 week | Third trimester |
| 32 | 7 months and 2 weeks | Third trimester |
| 33 | 7 months and 3 weeks | Third trimester |
| 34 | 8 months | Third trimester |
| 35 | 8 months | Third trimester |
| 36 | 8 months and 1 week | Third trimester |
| 37 | 8 months and 2 weeks | Third trimester |
| 38 | 8 months and 3 weeks | Third trimester |
| 39 | 9 months | Third trimester |
| 40 | 9 months and 1 week | Third trimester |
| 41 | 9 months and 2 weeks | Third trimester |
| 42 | 9 months and 3 weeks | Third trimester |
How pregnancy weeks are converted to months
Doctors date pregnancy in weeks, counted from the first day of your last menstrual period (LMP), not from conception. That is why a full-term pregnancy is 40 weeks even though conception happens about two weeks later.
A calendar month has about 4.33 weeks (52 weeks ÷ 12 months), so 40 weeks is 9 months and 1 week. Saying a pregnancy "lasts nine months" is a rounded figure; in weeks it is more precise.
Trimesters follow the usual clinical split: weeks 1–13 are the first trimester, weeks 14–27 the second and week 28 onward the third. Your care team may count slightly differently, so always follow the dates on your own records.
Weeks to months: quick answers
- How many months is 8 weeks pregnant?
- 8 weeks pregnant is 2 months. You are in the first trimester.
- How many months is 12 weeks pregnant?
- 12 weeks pregnant is 2 months and 3 weeks. You are in the first trimester.
- How many months is 16 weeks pregnant?
- 16 weeks pregnant is 3 months and 3 weeks. You are in the second trimester.
- How many months is 20 weeks pregnant?
- 20 weeks pregnant is 4 months and 3 weeks. You are in the second trimester.
- How many months is 24 weeks pregnant?
- 24 weeks pregnant is 5 months and 2 weeks. You are in the second trimester.
- How many months is 28 weeks pregnant?
- 28 weeks pregnant is 6 months and 2 weeks. You are in the third trimester.
- How many months is 30 weeks pregnant?
- 30 weeks pregnant is 7 months. You are in the third trimester.
- How many months is 32 weeks pregnant?
- 32 weeks pregnant is 7 months and 2 weeks. You are in the third trimester.
- How many months is 36 weeks pregnant?
- 36 weeks pregnant is 8 months and 1 week. You are in the third trimester.
- How many months is 40 weeks pregnant?
- 40 weeks pregnant is 9 months and 1 week. You are in the third trimester.
- How many weeks is 5 months pregnant?
- 5 months pregnant is about 21.7 weeks (5 × 4.33 weeks).
Pregnancy Weeks to Months
Convert your pregnancy progress from weeks to months instantly.
Enter Weeks
Input your current pregnancy week.
Get Months
Instantly see the equivalent in months.
Trimester
Find out which trimester you are currently in.
Common Questions
Why use weeks instead of months?
Doctors track pregnancy in weeks because it's more precise for fetal development.
How many weeks is 9 months?
A full-term pregnancy is typically 40 weeks, which is about 9 months and 1 week.
40 weeks pregnant is how many months?
40 weeks pregnant is 9 months and 1 week, in the third trimester.
41 weeks pregnant is how many months?
41 weeks pregnant is 9 months and 2 weeks, in the third trimester.
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