Weeks ↔ months

18 weeks pregnant in months

Week 18 of pregnancy falls in month 5 on the nine-month split Nawah's guide uses (weeks 17–20). In calendar terms, 18 weeks is 126 days, about 4 months and 4 days.

Pregnancy monthMonth 5 of 9
In days126 days
In calendar months4 months 4 days
Until week 4022 weeks

Why the two numbers differ

Pregnancy months are not four weeks each: nine months of about 4.4 weeks add up to 40 weeks, not 36. That is why doctors count in weeks, and the month your family names is an approximation.

Read the guide to month 5 →

Track more than one number

The Nawah app saves all of this automatically — week, weight, movements and contractions — in one place.

Get the app

Every week

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14
  15. 15
  16. 16
  17. 17
  18. 18
  19. 19
  20. 20
  21. 21
  22. 22
  23. 23
  24. 24
  25. 25
  26. 26
  27. 27
  28. 28
  29. 29
  30. 30
  31. 31
  32. 32
  33. 33
  34. 34
  35. 35
  36. 36
  37. 37
  38. 38
  39. 39
  40. 40
  41. 41
  42. 42

This guide is general information, not medical advice. It does not replace a doctor, and it knows nothing about your particular pregnancy. If something feels wrong, contact your doctor instead of waiting for the next scheduled visit.

← Weeks ↔ months converter