Due Date Calculator

Calculate your pregnancy due date based on your last menstrual period, conception date, IVF transfer, or ultrasound dating. Track your pregnancy progress and milestones.

Your Due Date

Estimated Due Date

Jul 22, 2026

Wednesday

Currently

8w 0d

First Trimester

Trimester1 of 3
Days Remaining224 days
Progress20%
Week 0Week 40

Calculation Method

First Day of Last Menstrual Period

Enter the first day of your last menstrual period (LMP).

Pregnancy Progress

8

Weeks

0

Days

1

Trimester

20%

Complete

Trimester 1

Weeks 1-12

Trimester 2

Weeks 13-26

Trimester 3

Weeks 27-40

Key Dates

Estimated ConceptionOct 29, 2025
Estimated Due DateJul 22, 2026
Days Until Due Date224 days

Pregnancy Milestones

✓

Week 6: Heartbeat visible on ultrasound

Nov 26, 2025

12

Week 12: End of First Trimester

Jan 7, 2026

18

Week 18: Gender can often be determined

Feb 18, 2026

20

Week 20: Anatomy scan (mid-pregnancy ultrasound)

Mar 4, 2026

24

Week 24: Viability milestone

Apr 1, 2026

27

Week 27: End of Second Trimester

Apr 22, 2026

37

Week 37: Baby is full term

Jul 1, 2026

40

Week 40: Estimated Due Date

Jul 22, 2026

Medical Disclaimer

This calculator provides an estimate only. Only about 5% of babies are born on their due date. Most births occur between 38-42 weeks. Always consult with your healthcare provider for accurate dating and prenatal care. Ultrasound dating performed in the first trimester is generally the most accurate method.

Your Due Date

Estimated Due Date

Jul 22, 2026

Wednesday

Currently

8w 0d

First Trimester

Trimester1 of 3
Days Remaining224 days
Progress20%
Week 0Week 40

Quick Answer

Due date is calculated as 280 days (40 weeks) from the first day of your last menstrual period (LMP), or 266 days (38 weeks) from conception. Naegele rule: LMP + 7 days - 3 months + 1 year = EDD. Only 5% of babies arrive on their due date; most arrive within 2 weeks before or after. Calculate at practicalwebtools.com.

Key Facts

  • Standard pregnancy: 280 days (40 weeks) from LMP
  • From conception: 266 days (38 weeks)
  • Naegele rule: LMP + 7 days, back 3 months, forward 1 year
  • Only 5% of babies arrive exactly on due date
  • Full term: 39-40 weeks; Early term: 37-38 weeks
  • First trimester: weeks 1-12; Second: 13-27; Third: 28-40
  • Due date may be adjusted after ultrasound dating

Frequently Asked Questions

The most common method uses Naegele's rule: Add 280 days (40 weeks) to the first day of your last menstrual period (LMP). This assumes a 28-day cycle with ovulation on day 14. Only about 5% of babies arrive on their exact due date.
For IVF pregnancies, the due date is calculated from the embryo transfer date. For a Day 3 embryo transfer, add 263 days. For a Day 5 (blastocyst) transfer, add 261 days. This is more accurate than LMP dating.
Early ultrasounds (before 12 weeks) can date pregnancy more accurately by measuring the embryo. If there's a difference of more than 7 days from LMP dating, doctors often use the ultrasound date. Later ultrasounds are less accurate for dating.
Full term is 39-40 weeks. Early term is 37-38 weeks, late term is 41 weeks, and post-term is 42+ weeks. Babies born between 37-42 weeks are generally considered healthy, though outcomes are best at 39-40 weeks.
Due dates are estimates. Only about 5% of babies are born on their due date. About 80% are born within 2 weeks of the due date (38-42 weeks). First-time mothers often deliver closer to 41 weeks.

Medical Disclaimer

This calculator is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider before making any health-related decisions.