Due Date Calculator

Your details

Pick the date you know best. An early ultrasound is the most accurate; IVF is also very precise.
The typical number of days from the start of one period to the next.
days
Estimated due date
Sat 8 Aug 2026
Weeks along today40weeks
Gestational age today40 weeks 0 days
Current trimesterThird trimester
Est. conception dateSat 15 Nov 2025
Days until due dateDue today
40 wk
  • 2nd trimester
  • Anatomy scan
  • 3rd trimester
  • Full term
  • Due date

Your estimated due date is Sat 8 Aug 2026, you are about 40 weeks 0 days along (Due today).

  • Every method is converted to the same clock: due date is your effective last period plus 280 days (40 weeks).
  • Only about 1 in 25 babies arrive on the exact due date; most births happen within two weeks either side.
  • An early dating ultrasound is the most accurate method, especially with an irregular cycle, so your provider may revise this.

Next stepShare this estimate with your midwife or doctor, who can confirm it with a scan.

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