Calculate your baby's due date, current pregnancy week and key milestones.
📅 Based on Last Period
💕 Based on Conception Date
🔬 Based on Ultrasound
Estimated Due Date
–
–
–
Weeks Along
–
Days to Go
–
Trimester
📅 Key Milestones
AD · Google AdSense
About This Pregnancy Due Date Calculator
This pregnancy due date calculator estimates your baby's due date from the first day of your last menstrual period and your average cycle length, using the standard method of around 40 weeks from your last period. It can also estimate from a known conception date.
This is general information only and not medical advice. Only around 1 in 20 babies arrive on their exact due date — it's a guide, not a guarantee. Your doctor or midwife will confirm your due date with a dating scan.
Frequently Asked Questions
How is a due date calculated?+
The common method adds 40 weeks — 280 days — to the first day of your last menstrual period, adjusted for your cycle length.
How accurate is the due date?+
It's an estimate. Most babies arrive within a week or two either side, and a dating ultrasound gives the most accurate due date.
Can I calculate from the conception date?+
Yes. If you know your conception date, the calculator can estimate the due date from that instead.