Due date calculator

also MM/DD/YYYY or DD.MM.YYYY
days
typically 28; counted from period to period
empty = today

Result

Estimated due date
Tuesday, 15 December 2026
Gestational age
28 weeks 5 days (week 29 of pregnancy)
Trimester
Third trimester (from 28 weeks 0 days)
Until the due date
79 days to go
Full-term window
24/11/2026 to 28/12/2026 (37w 0d to 41w 6d)
Conception (estimated)
around 24/03/2026
Calculation
  • Naegele’s rule: 10/03/2026 + 280 days (40 weeks)
  • Cycle length 28 days – no adjustment
  • Estimated due date: 15/12/2026
  • Reference date: 27/09/2026
  • Since 0w 0d: 201 days = 28 weeks 5 days
This is only an estimate and does not replace medical advice. The due date set by your doctor or midwife (often adjusted by ultrasound) is the one that counts.