🤰Pregnancy Due Date Calculator

Estimate your due date from your last period, conception date, or an ultrasound — with your current gestational age, trimester, and a normal due window.

Dating method

First day of last period

Cycle length (optional, days)

Default is 28. Adjust if your cycle is consistently longer or shorter — this shifts the estimated ovulation day.

Conception / ovulation date

The estimated date of conception or ovulation. The due date is calculated as 266 days (38 weeks) from this date.

Date of ultrasound scan

Gestational age at scan

Weeks

Days (0–6)

Enter the gestational age your sonographer measured at the scan date.

Enter a date above to see your estimated due date

This tool provides an estimated due date only — only about 5% of babies arrive on the exact EDD, and a normal arrival window spans weeks 37–42. A first-trimester ultrasound is generally more accurate than period-based dating and takes precedence when the two differ by more than about a week (per ACOG guidelines). This estimate is not medical advice. Please begin prenatal care early and confirm your dating with your doctor or midwife — they can give you the most accurate information and personalised care throughout your pregnancy.

Free Due Date Calculator Online

Expecting? Our free Due Date Calculator estimates when your baby might arrive the moment you enter a date. As a simple due date calculator, it uses the first day of your last menstrual period — the standard Naegele's rule — to estimate your due date, and you can fine-tune it with your cycle length or switch to a conception or ultrasound date for a closer fit.

Beyond the date, it shows how far along you are right now in weeks and days, which trimester you're in, and a normal "due window" around your estimated date — because only about 1 in 20 babies actually arrives on the exact day. It's a friendly way to follow your pregnancy timeline and plan ahead.

Simply enter your date to see your estimate instantly. No sign-up, no downloads, no limits. Your due date is an estimate — an early ultrasound and your doctor or midwife will give you the most accurate dating and care. Learn more in the FAQ or About pages.