Pregnancy Due Date Calculator
Find your estimated delivery date using LMP, conception date, or IVF transfer date — instantly and accurately.
Calculate Your Estimated Due Date (EDD)
🎉 Your Pregnancy Estimate
How to Use This Calculator
- 1Select your preferred calculation method: LMP date, conception date, or IVF transfer date.
- 2Enter the required date in the input field using the calendar picker or manual entry.
- 3For LMP method, adjust your average cycle length if it differs from the default 28 days.
- 4Click the "Calculate Due Date" button or press Enter to generate results.
- 5View your estimated due date, current pregnancy week, trimester, days remaining, and progress bar.
- 6Use the Clear button to reset and calculate for a different date if needed.
Key Features
3 Calculation Methods
Calculate by LMP, conception date, or IVF embryo transfer for accurate and flexible results.
Variable Cycle Support
Adjustable cycle length (20–45 days) ensures accuracy for women with irregular periods.
IVF-Ready
Supports both Day 3 and Day 5 IVF embryo transfers, widely used in fertility clinics across India.
Trimester Tracking
See which trimester you are in and a visual progress bar showing how far along your pregnancy is.
Instant & Private
All calculations happen in your browser — no data is sent to any server, keeping your details private.
Mobile Friendly
Works perfectly on smartphones, tablets, and desktops — ideal for use anywhere, anytime.
Formula & How It Works
Method 1: Last Menstrual Period (LMP) — Naegele's Rule
The most widely used clinical method. The formula adjusts for custom cycle lengths:
- EDD = LMP Date + 280 days (for a 28-day cycle)
- Cycle adjustment: EDD = LMP + 280 + (Cycle Length − 28)
- A 30-day cycle adds 2 extra days to the standard EDD.
Method 2: Conception / Ovulation Date
If you know when conception occurred (via ovulation tracking or ultrasound confirmation):
- EDD = Conception Date + 266 days (38 weeks from fertilisation)
- Pregnancy is counted as 40 weeks from LMP but only 38 weeks from conception.
Method 3: IVF Embryo Transfer Date
- Day 5 (Blastocyst): EDD = Transfer Date + 261 days
- Day 3 (Cleavage): EDD = Transfer Date + 263 days
- These values account for the embryo age at the time of transfer relative to fertilisation.
Practical Examples
🇮🇳 Example 1 — Priya, Mumbai (LMP Method)
Priya's last menstrual period started on 1 April 2025 with a 28-day cycle. Using Naegele's Rule: EDD = 1 April + 280 days = 6 January 2026. At 8 weeks, she is in her first trimester with approximately 196 days remaining.
🇮🇳 Example 2 — Ananya, Bengaluru (IVF Day 5 Transfer)
Ananya had a Day 5 blastocyst embryo transfer on 15 March 2025 at a fertility clinic. EDD = 15 March + 261 days = 1 December 2025. Her doctor confirmed this aligns with the clinic's own calculation.
🇬🇧 Example 3 — Sarah, London (Conception Date)
Sarah tracked her ovulation and confirmed conception on 10 February 2025. EDD = 10 February + 266 days = 3 November 2025. She is currently in her second trimester, week 18, with 154 days to go.
🇮🇳 Example 4 — Rekha, Delhi (Long Cycle)
Rekha has a 35-day cycle and her LMP was 1 March 2025. Adjusted EDD = 1 March + 280 + (35−28) = 1 March + 287 days = 12 December 2025. The cycle adjustment adds 7 days compared to the standard formula.
What Is a Pregnancy Due Date Calculator?
A pregnancy due date calculator estimates the date on which your baby is most likely to be born, known as the Estimated Due Date (EDD) or Expected Date of Delivery (EDD). Only about 5% of babies arrive exactly on their due date, but the EDD is a critical planning milestone used by doctors, midwives, and expectant parents worldwide.
In India, due date calculators are increasingly used alongside ultrasound scans, especially during the first trimester. Doctors at AIIMS, Apollo, and Manipal hospitals routinely use EDD to schedule antenatal check-ups, scans, and delivery planning. Knowing your EDD helps you track fetal development week-by-week and prepare for delivery.
This calculator supports three medically recognised methods — LMP (Naegele's Rule), conception date, and IVF embryo transfer — covering the needs of both naturally conceived and assisted reproduction pregnancies.
📖 Want a detailed guide on understanding due dates, trimesters, and pregnancy weeks? Read our in-depth article: How to Calculate Your Pregnancy Due Date — Complete Guide
Frequently Asked Questions
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