Pregnancy Due Date Calculator
Calculate your expected due date from LMP, conception date, or IVF transfer date.
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Based on Naegele's Rule: LMP date + 280 days (40 weeks). Assumes a regular 28-day cycle with ovulation on day 14.
* Due dates are estimates. Only about 5% of babies are born exactly on the due date. Regular prenatal check-ups are essential. This calculator is for informational purposes only — not a substitute for medical advice.
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About this tool
How to use Pregnancy Due Date Calculator
- 1Select calculation method: Last Menstrual Period (LMP), Conception Date, or IVF Transfer
- 2Enter the relevant date
- 3For IVF, specify if it was a Day 3 or Day 5 embryo transfer
- 4View due date, weeks pregnant, trimester, and key pregnancy milestones
Frequently Asked Questions
How is the due date calculated from LMP?
Using Naegele's Rule: add 280 days (40 weeks) to the first day of your last menstrual period. This assumes a regular 28-day cycle with ovulation on day 14. The actual delivery date is within ±2 weeks in most cases.
What if my cycle is irregular?
Naegele's Rule works best for regular 28-day cycles. If your cycle is irregular, the conception date method or early ultrasound dating is more accurate. Your OB-GYN may adjust the due date after the first ultrasound.
What do the trimesters mean?
Trimester 1: weeks 1–13 (organ formation), Trimester 2: weeks 14–27 (growth and movement), Trimester 3: weeks 28–40 (final development). Each trimester has different screening tests and developmental milestones.
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