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Pregnancy Due Date Calculator

Work out your estimated due date and how far along you are, and see the dates that matter along the way.

Enter a date to see your estimated due date and a week-by-week timeline.

Only about 4–5% of babies are born on their due date. Most arrive between 37 and 42 weeks, so treat this as a guide.

This is an estimate for information only and doesn’t replace advice from a doctor or midwife. Your provider may adjust the date after an ultrasound.

Find Your Due Date and How Far Along You Are

Enter the first day of your last period, or use a conception date, an IVF embryo transfer or an ultrasound measurement. You’ll get your estimated due date, your current week, the trimester and a timeline of key dates, with Nepali (BS) dates available too.

What you can do

  • Four methods: last menstrual period (adjusted for your cycle length), conception date, IVF day-3 or day-5 transfer, and ultrasound dating.
  • Current gestational age in weeks and days, a progress ring and the trimester.
  • Key dates: second and third trimester, anatomy scan window, early term, due date and post-term.
  • Optional Bikram Sambat (BS) dates alongside the usual calendar.

Good to know

  • Due dates are estimates. Only 4–5% of babies are born on the exact date, and most arrive between 37 and 42 weeks.
  • Your doctor or midwife may adjust the date after an early ultrasound, which is the most accurate way to date a pregnancy.
  • Nothing you enter is stored or sent anywhere.

Frequently asked questions

How is the due date calculated?

From the first day of your last period, add 280 days (40 weeks). If your cycle isn’t 28 days, the date is adjusted by the difference. For conception the due date is 266 days later.

How do I calculate my due date with IVF?

Add 261 days to a day-5 (blastocyst) transfer date or 263 days to a day-3 transfer date. Choose IVF in the calculator.

How many weeks pregnant am I?

Weeks are counted from the first day of your last period, not from conception. The calculator shows your current week and days.

Can I see the due date in Nepali (BS) dates?

Yes. Tick the option to show Bikram Sambat dates next to each date.

Is this a medical diagnosis?

No. It is an estimate for information only. Confirm your dates with a doctor or midwife.