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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.
Free · No sign-up · Updated August 2026
Estimated due date
Saturday, May 1, 2027
Est. conception
8/8/2026
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.