Pregnancy calculator

One timeline for the whole pregnancy: estimated due date, gestational age today, conception estimate, trimester boundaries, and days remaining.

How to Pregnancy calculator

1. Step 1. Choose what you know: LMP, due date, or conception date.
2. Step 2. Enter the date and your average cycle length.
3. Step 3. Review gestational age, trimester, due date, and progress.
4. Step 4. Check the trimester milestone dates in the timeline.

Frequently asked questions

How is gestational age counted?

From the first day of the last menstrual period (LMP) — not conception. So at conception you are already “2 weeks pregnant” by clinical convention.

How accurate is the due date?

Only ~4% of babies arrive exactly on the due date; about 80% arrive within ±10 days. First-trimester ultrasound is the most accurate dating method.

What if my cycle is not 28 days?

The calculator adjusts: ovulation (and therefore the due date) shifts by the difference between your cycle length and 28 days.