Pregnancy Due Date Calculator
Estimate your due date from your last menstrual period, conception date, or an ultrasound, and follow your pregnancy week by week.
Pregnancy milestones
Why this calculator exists
A due date is an estimate calculated from a single reference point — the first day of your last period, a conception date, or an early ultrasound — and the maths behind each method is easy to get wrong by hand. This calculator applies the standard clinical formulas used for due-date estimation to give you a quick, consistent result, along with your current week, trimester, and a milestone timeline. It's built to complement, not replace, the dating and monitoring your doctor or midwife provides throughout your prenatal care.
Where this calculator is useful
Expecting parents
Track your pregnancy week by week, and plan maternity leave, a baby shower, and hospital visits around your estimated due date.
Doctors & midwives
A quick reference for estimating due dates from LMP, conception, or ultrasound dating during consultations and checkups.
Family & friends
Keep track of when a loved one's baby is due, so you can plan visits, gifts, and support around the estimated arrival.
Baby showers
Time a baby shower for the ideal window, typically during the second trimester, based on the estimated due date.
Education
Use this tool in health education settings to demonstrate how due dates and gestational age are estimated.
General reference
A straightforward way to check due-date estimates and trimester milestones for reference or planning purposes.
Planning & preparation
Work backward from the estimated due date to plan a hospital bag, nursery setup, and household arrangements.
Due date announcements
Share a due-date estimate with family and friends, or send them a link with your details pre-filled.
How it works
1. Choose your method
Select from three methods: Last Menstrual Period (LMP), Conception Date, or Ultrasound Date.
- LMP is the most commonly used method.
- Conception date can give a more precise estimate.
- Ultrasound date uses your scan's gestational age.
2. Enter your date
Enter the date for your chosen method, or use Today for quick entry.
- Your due date is calculated instantly.
- See your exact weeks, days, and trimester.
- Follow pregnancy milestones week by week.
3. Share the result
Use the share buttons to send your due-date estimate to family or your care team.
- Facebook, Twitter, WhatsApp, Telegram, Email
- Share a link with your details pre-filled.