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Pregnancy Due Date Calculator

Estimate your due date and see how far along you are today.

Your details

Calculate from

First day of your last period

Average cycle length — 28 days

Your results

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Estimated due date

🤰 How far along today—

📅 Current trimester—

⏳ Days remaining—

🎉 Next milestone—

🌱 Estimated conception—

This is an estimate using Naegele's rule (280 days from your last period). Only about 4% of babies arrive on the exact due date — a normal birth window is 37–42 weeks. Your doctor's ultrasound dating is the most reliable.

Your pregnancy milestones

Milestone	Week	Estimated date
🌸 End of first trimester	13 weeks	—
🔎 Halfway there	20 weeks	—
💛 Viability milestone	24 weeks	—
🌼 Third trimester begins	28 weeks	—
✅ Full term begins	37 weeks	—
🎉 Due date	40 weeks	—

Estimated dates counted from your last period. The highlighted row is your next upcoming milestone. Viability and full-term markers are approximate — your provider's dating and guidance always take priority.

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How is a due date calculated?

The standard method, Naegele's rule, adds 280 days (40 weeks) to the first day of your last menstrual period (LMP). Pregnancy is counted from the LMP, not conception, which is why you're already considered "2 weeks pregnant" at the moment of conception.

The three trimesters

First trimester: weeks 1–12
Second trimester: weeks 13–26
Third trimester: weeks 27–40

What if my cycle isn't 28 days?

A longer or shorter cycle shifts ovulation, so we adjust the due date by the difference from a 28-day cycle.

Is the due date exact?

No. It's a best estimate — most babies are born within two weeks either side of it. Always follow your healthcare provider's dating.