Due Date Calculator · 3 ways · 1 answer
Pick the method that matches your story — last menstrual period, conception date, or IVF transfer. We'll show you the week, trimester, what's happening inside, and what to expect next.
First day of last period
We never store this. Calculation happens privately on your device.
Don't remember the exact date?
Pick the closest day you remember — Denny will help refine it once you have your first ultrasound.
Get personalized week-by-week guidance →Pick a date to see your story so far.
Your due date, current week, fruit-size of baby, and trimester appear here.
Why we built this
Naegele's rule (LMP + 280 days) is the standard, but if you know your conception date or had IVF, those calculations are more accurate.
The dating ultrasound at 8–12 weeks remains the gold standard for EDD — please update your due date with your provider after that scan.
This tool is free. The mom who built it would love to walk with you.
Inside Denny: every tool above + a warm AI who remembers your week, your name, and your last ultrasound. 7 days free, no card.
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