Pregnancy Due Date Calculator

Free pregnancy due date calculator. Find your estimated due date, current week, trimester, and days remaining in your pregnancy.

✓ Free to use ✓ Instant results ✓ Mobile friendly ✓ No sign-up needed

First Day of Last Menstrual Period (LMP)

Average Cycle Length (days)

Estimated Due Date

Weeks Pregnant

Current Trimester

Days Remaining

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How is a Due Date Calculated?

The estimated due date (EDD) is typically calculated by adding 280 days (40 weeks) to the first day of your last menstrual period. This is known as Naegele's rule and is adjusted for non-standard cycle lengths.

Pregnancy Trimesters

First Trimester: Weeks 1–12. Major organ development occurs.
Second Trimester: Weeks 13–27. Most women feel best during this period.
Third Trimester: Weeks 28–40. Baby grows and prepares for birth.

Frequently Asked Questions

How accurate is this due date calculator?+

This calculator uses Naegele's rule, the same method used by most healthcare providers. Only around 5% of babies are born exactly on their due date — most arrive within two weeks either side.

What if my cycle is not 28 days?+

Enter your actual average cycle length and the calculator will adjust accordingly. A longer cycle shifts the due date later; a shorter cycle shifts it earlier.

When should I see a doctor?+

You should contact your GP or midwife as soon as you suspect you are pregnant. Early antenatal care (before 10 weeks) is recommended.

Pregnancy Due Date Calculator

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How is a Due Date Calculated?

Pregnancy Trimesters

Frequently Asked Questions

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