Pregnancy Due Date Calculator – Find Your Baby’s Arrival

🤰 Pregnancy

Pregnancy Due Date Calculator

Calculate your estimated due date using your last menstrual period, conception date, or IVF transfer date.

Last Period (LMP)
Conception Date
IVF Transfer
days

Due Date Results

Estimated Due Date
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📊 Pregnancy Stats

📅 Pregnancy Timeline

First Trimester
Weeks 1–12 · Organogenesis
Second Trimester
Weeks 13–26 · Growth phase
Third Trimester
Weeks 27–40 · Final preparation

💡 Pro Tips

📏
Naegele's Rule: Adds 280 days (40 weeks) to your LMP. Cycle length adjustments shift the date proportionally.
🔬
Most accurate method: An ultrasound in the first trimester (weeks 8–14) gives the most precise due date confirmation.

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Wondering when your baby will arrive? Our free Pregnancy Due Date Calculator gives you an accurate estimated due date in seconds – no sign-up required. Simply enter your last menstrual period (LMP), conception date, or IVF transfer date and get an instant result with your current trimester, weeks pregnant, and days remaining.

Every pregnancy is unique, but this tool uses the gold-standard Naegele’s Rule and adjusts for your personal cycle length to give the most accurate estimate possible before an ultrasound confirmation.

How to Use This Calculator

  1. Choose your calculation method – Last Period (LMP), Conception Date, or IVF Transfer Date.
  2. Enter the date for your chosen method using the date picker.
  3. If using LMP, enter your average cycle length (default is 28 days). Adjust if your cycle is shorter or longer.
  4. Click “Calculate Due Date” to instantly see your estimated due date, weeks pregnant, trimester, and days remaining.
  5. Download your results as an image to share with your partner or doctor.

Key Facts About Pregnancy Duration

  • Full-term pregnancy: 40 weeks (280 days from LMP)
  • Days from conception: 266 days
  • First trimester: Weeks 1–12 (organogenesis)
  • Second trimester: Weeks 13–26 (growth phase)
  • Third trimester: Weeks 27–40 (final preparation)
  • Only 5% of babies are born exactly on their due date – ±2 weeks is completely normal

Frequently Asked Questions

How accurate is this due date calculator?

This calculator uses Naegele’s Rule the same method used by doctors and midwives worldwide. It is accurate to within a few days when your LMP date is known. However, only a first-trimester ultrasound can give a definitive confirmed date.

What if my cycle is not 28 days?

No problem! Simply enter your actual average cycle length. Our calculator adjusts the due date accordingly longer cycles push the date later, shorter cycles bring it forward.

What is the difference between LMP and conception date methods?

LMP (Last Menstrual Period) is the most commonly used method because most women know this date. Conception date adds 266 days from when fertilisation occurred. IVF transfer date uses the same 266-day formula from the embryo transfer.

Only 5% of babies are born on their due date – is this normal?

Completely normal! The due date is an estimate, not a deadline. Most babies arrive within 2 weeks before or after. Anything between 37 and 42 weeks is considered full term.

⚠️ Disclaimer: This calculator is for informational purposes only. Always confirm your due date with a qualified healthcare provider or midwife. Do not make medical decisions based solely on this tool