How to Use 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.
Open the Pregnancy Due Date Calculator tool →What is Pregnancy Due Date Calculator?
Estimate your due date, conception date and current pregnancy week from your last period. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Pregnancy Due Date Calculator
- Open the Pregnancy Due Date Calculator tool.
- Enter your details or values.
- The result is calculated instantly.
- Copy or use the result. Everything runs in your browser — nothing is 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.
Ready to try it?
Open Pregnancy Due Date Calculator →