Free Pregnancy Due Date Calculator
Estimate your due date from your last period, conception, ultrasound, or IVF transfer β with gestational age, trimester milestones, a countdown, and an add-to-calendar reminder. Private and free.
Find your estimated due date and see how far along you are β from your last period, conception, an ultrasound, or IVF.
π All dates are calculated in your browser. Nothing you enter is uploaded or stored.
Common uses
- Due Date by Last Period (LMP)Calculate your estimated due date from the first day of your last menstrual period using Naegele's rule, adjusted for your cycle length.
- Due Date by Conception DateKnow the day you conceived or ovulated? Get your due date as conception + 266 days, with trimester milestones and a countdown.
- IVF Due Date CalculatorCalculate your due date from your embryo-transfer date for day-3 or day-5 (blastocyst) transfers.
- How Many Weeks Pregnant Am I?Enter the first day of your last period and instantly see how many weeks and days along you are, plus which trimester.
- Due Date by UltrasoundEnter the gestational age your dating scan reported and the scan date to get an ultrasound-based due date.
- Conception Date CalculatorEstimate when you likely conceived from your last period or your due date.
How It Works
Estimates your due date with Naegele's rule β 280 days (40 weeks) from the first day of your last period β and adjusts for cycle length, or works backwards from a conception date, an ultrasound dating, or an IVF transfer. Everything is computed in your browser.
- 1Pick how you want to date the pregnancyLast period (LMP), conception/ovulation date, an ultrasound (enter the gestational age the scan reported), or an IVF embryo-transfer date (day-3 or day-5).
- 2Enter the date (and cycle length)For LMP dating, adjust the cycle-length slider β a cycle longer than 28 days pushes ovulation, and the due date, later. A first-trimester ultrasound is the most accurate method.
- 3See your due date and milestonesYou get the estimated due date, how many weeks and days along you are today, the dates each trimester begins, the 24-week viability and 39-week full-term marks, and a countdown.
- 4Save a reminderDownload an .ics calendar event for your due date, or copy the summary to share. Nothing is uploaded.
A due date is sensitive information. Every calculation runs locally in your browser β your dates are never uploaded, logged, or stored.
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