How is a due date calculated from my last period?

Naegele's rule adds 280 days (40 weeks) to the first day of your last menstrual period. This calculator also adjusts for cycle lengths other than 28 days.

How accurate is a due date calculator?

It is an estimate. Only about 5% of babies are born on their exact due date, and most arrive within two weeks before or after. A first-trimester ultrasound is the most accurate way to date a pregnancy.

Can I calculate a due date from conception or ovulation?

Yes. From a known conception or ovulation date, the estimated due date is 266 days (38 weeks) later.

How does it work for IVF or a frozen embryo transfer?

The tool uses your transfer date and the embryo age at transfer (Day 3, 5, or 6). The due date is the transfer date plus 266 days minus the embryo age.

Is this medical advice?

No. This calculator provides estimates for information only and is not a substitute for professional medical advice. Always consult your healthcare provider.

Free Online Pregnancy Due Date Calculator (No Signup)

⚠️ Disclaimer:
The estimated due date is based on the information provided and is for informational purposes only. Actual delivery dates may vary. Please consult your healthcare provider for accurate pregnancy assessment and medical advice.

📅 Calculate Your Due Date

First Day of Last Menstrual Period

Average Cycle Length

Conception / Ovulation Date

Embryo Transfer Date

Embryo Age at Transfer

Ultrasound Date

Gestational Age at Ultrasound

Multiple Pregnancy (Twins/Triplets)

Multiple pregnancies typically deliver 2-3 weeks earlier than singleton pregnancies.

💡 How to Use

Choose your calculation method:

LMP: Most common – uses first day of your last period
Conception: If you know when you conceived
IVF/FET: For IVF pregnancies – uses transfer date
Ultrasound: Most accurate with first trimester measurements

⚠️ Medical Disclaimer:
This calculator provides estimates only. Always consult your healthcare provider for medical advice and accurate pregnancy dating.

Did you know?

Only about 5% of babies are born on their exact due date. Most arrive within 2 weeks before or after.

📊 Pregnancy Progress Charts

Visual overview of your pregnancy journey

Progress by Trimester

Baby's Growth (Length)

📈 Weekly Progress

⚖️ Suggested Weight Gain

General guidelines – always consult your doctor for personalized advice.

Typical weight gain: 25-35 lbs for normal BMI. First trimester: 1-5 lbs total. Second & third trimester: ~1 lb per week.

👶 Week-by-Week Development Guide

Week 4

🍎 Size Comparison Chart

🏥 Recommended Appointments & Tests

Based on your due date, here are important prenatal milestones. Dates are estimates – your doctor may adjust based on your needs.

📅 Pregnancy Calendar Overview

🦶 Baby Kick Counter

Track your baby's movements. Most doctors recommend counting kicks after 28 weeks. Aim for 10 kicks in under 2 hours.

kicks this session

Tap when you feel baby move

0:00

Session Time

0/10

Goal Progress

Avg. Time to 10

📊 Kick History

⏱️ Contraction Timer

Time your contractions to know when to head to the hospital. Track duration and frequency.

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Press Start when contraction begins

When to go to hospital:
The 5-1-1 rule: Contractions 5 minutes apart, lasting 1 minute each, for 1 hour. Always call your doctor if unsure!

📋 Contraction History

Avg Duration

Avg Frequency

Total Count

🎒 Hospital Bag Checklist

Pack your hospital bag around 36 weeks. Check off items as you pack them.

0% packed

🤰 Pregnancy Due Date Calculator

📅 Calculate Your Due Date

💡 How to Use

📅 Due Date

📆 Current Week

🔢 Trimester

⏳ Days Left

⏰ Countdown to Baby

📋 Upcoming Milestones

👶 Baby's Development This Week