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Pregnancy Due Date Calculator
Calculate your estimated due date using Naegele's rule, adjusted for your cycle length, along with your estimated conception date, current pregnancy week and trimester.
Estimated due date
Wednesday, March 17, 2027
Est. conception
6/24/2026
Current week
Week 8
Trimester
First
⚕️ An estimate based on Naegele's rule. Your provider's dating scan is definitive.
🔒 This tool runs entirely in your browser. Your data is never uploaded.
Frequently asked questions
How is the due date estimated?＋
By adding 280 days (40 weeks) to the first day of your last menstrual period — the standard Naegele's rule.
How accurate is it?＋
It's an estimate; only about 1 in 20 babies arrive on the exact date. An ultrasound gives a more precise date.
Is this medical advice?＋
No — always confirm with your healthcare provider.