Due date calculator
Four ways to pin down the big day — LMP, conception, IVF, or scan.
What it does
The Due Date Calculator & Milestone Studio estimates your estimated due date from the first day of your last period, a conception date, an embryo transfer date (3-day or 5-day blastocyst), or an ultrasound scan date. Around that date it builds a whole studio: a gestational week explorer with development notes and baby-size comparisons, a clinical care checklist (first prenatal visit, NIPT screening window, anatomy scan, glucose test), a live partner-sync link and QR code, and a printable summary report for your care team.
Who it’s for
Newly pregnant users who want a date and a plan in the same sitting — and partners who want to stay synced without asking "how far along are we?" every week.
How to use it, step by step
- Pick a tab for how you want to calculate: LMP, conception, IVF transfer, or ultrasound scan date.
- Enter the date (and your average cycle length for the LMP method), then tap Calculate Due Date.
- Read your gestational progress, then open the Weekly Milestones tab and use the week explorer to see what develops week by week.
- Work through the Clinical Care Checklist so screening windows do not sneak past.
- Use the Live Sync tab to share a sync link or QR code with your partner, and the Summary tab to print a report for your OB/GYN or midwife.
What you get
Your estimated due date, current gestational week and day, a week-by-week milestone and baby-size explorer, a clinical checklist, and a printable due-date summary.
✦ A worked example
You give itFirst day of last period: January 1, with a 28-day cycle.
You getAn estimated due date 280 days later in early October, a week explorer you can open at Week 12 to read that "fingers can open and close, toes can curl" — plus the screening windows for weeks 10–13 and 18–22 already on your checklist.
💡 Tips & tricks
- IVF pregnancies get the most precise result from the transfer-date tab — pick 3-day embryo or 5-day blastocyst to match your transfer.
- The ultrasound tab is handy after a dating scan: it re-anchors the whole milestone timeline to the scan date.
- Print the summary before your first prenatal visit — it is formatted as a care-team handout.
Enough reading — the tool itself is one tap away, and it is free.
Try the Due date calculator →