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Pregnancy weeks → months
Convert gestational weeks to an approximate month value and see the trimester.
Estimate, not a diagnosis. This tool gives an educational estimate based on the numbers you enter. It cannot account for your individual health history — consult a healthcare professional for anything clinical.
Notes
Months are approximate — different sources map weeks to months differently. We use 4.345 weeks per month for a simple, consistent conversion and show standard trimester boundaries.
Related tools
Weeks to months, quick reference
| Weeks | Months | Trimester |
|---|---|---|
| 4 | 0.9 months | First |
| 5 | 1.2 months | First |
| 6 | 1.4 months | First |
| 7 | 1.6 months | First |
| 8 | 1.8 months | First |
| 9 | 2.1 months | First |
| 10 | 2.3 months | First |
| 11 | 2.5 months | First |
| 12 | 2.8 months | First |
| 13 | 3.0 months | First |
| 14 | 3.2 months | Second |
| 15 | 3.5 months | Second |
| 16 | 3.7 months | Second |
| 17 | 3.9 months | Second |
| 18 | 4.1 months | Second |
| 19 | 4.4 months | Second |
| 20 | 4.6 months | Second |
| 21 | 4.8 months | Second |
| 22 | 5.1 months | Second |
| 23 | 5.3 months | Second |
| 24 | 5.5 months | Second |
| 25 | 5.8 months | Second |
| 26 | 6.0 months | Second |
| 27 | 6.2 months | Second |
| 28 | 6.4 months | Third |
| 29 | 6.7 months | Third |
| 30 | 6.9 months | Third |
| 31 | 7.1 months | Third |
| 32 | 7.4 months | Third |
| 33 | 7.6 months | Third |
| 34 | 7.8 months | Third |
| 35 | 8.1 months | Third |
| 36 | 8.3 months | Third |
| 37 | 8.5 months | Third |
| 38 | 8.7 months | Third |
| 39 | 9.0 months | Third |
| 40 | 9.2 months | Third |
| 41 | 9.4 months | Third |
| 42 | 9.7 months | Third |
Common conversions
How many months is 20 weeks pregnant?
20 weeks pregnant is approximately 4.6 months, using the standard 4.345-weeks-per-month conversion. That places you in the Second trimester.
How many months is 18 weeks pregnant?
18 weeks pregnant is approximately 4.1 months, using the standard 4.345-weeks-per-month conversion. That places you in the Second trimester.
How many months is 34 weeks pregnant?
34 weeks pregnant is approximately 7.8 months, using the standard 4.345-weeks-per-month conversion. That places you in the Third trimester.
How many months is 24 weeks pregnant?
24 weeks pregnant is approximately 5.5 months, using the standard 4.345-weeks-per-month conversion. That places you in the Second trimester.
How many months is 12 weeks pregnant?
12 weeks pregnant is approximately 2.8 months, using the standard 4.345-weeks-per-month conversion. That places you in the First trimester.
How many months is 8 weeks pregnant?
8 weeks pregnant is approximately 1.8 months, using the standard 4.345-weeks-per-month conversion. That places you in the First trimester.
How many months is 32 weeks pregnant?
32 weeks pregnant is approximately 7.4 months, using the standard 4.345-weeks-per-month conversion. That places you in the Third trimester.
How many months is 15 weeks pregnant?
15 weeks pregnant is approximately 3.5 months, using the standard 4.345-weeks-per-month conversion. That places you in the Second trimester.