◑ HEALTH Updated July 25, 2026

Pregnancy Week Calculator

Track your pregnancy week by week from one date.

First day of last period
Result
Ad space · belowTool · horizontal

How it works

Gestational age is counted from the first day of your last menstrual period, and the estimated due date is 280 days (40 weeks) after it — the same Naegele's rule clinics use.

Related tools

◕BMR Calculator◈Calorie Calculator▣Body Fat Calculator

Frequently asked questions

Is this the same as conception date?

No. Gestational age starts about two weeks before conception, which is why the first two weeks are pre-conception.

How accurate is the due date?

Only about 5% of babies arrive on it; an early ultrasound gives a more precise date.

Comments

Comments aren't enabled yet. When you're ready, this is where a service like Giscus, Disqus, or a custom form would go — the slot is already reserved on every tool page.