Estimate your baby's conception date with our accurate Pregnancy Conception Calculator. Input your Last Menstrual Period (LMP) or estimated due date to get an approximate conception date. This tool helps track your pregnancy timeline and understand key milestones.
Please enter a valid LMP date. It cannot be in the future.
Please enter a valid Due Date. It cannot be in the past.
How to Use the Pregnancy Conception Calculator
Choose Calculation Method: Select "Last Menstrual Period (LMP)" or "Estimated Due Date"
Enter Date: Input your LMP date or estimated due date using the date picker
Calculate: Click "Calculate Conception Date" to get your estimated conception date
Review Results: See your estimated conception date displayed clearly
Clear for New Calculation: Use "Clear" to reset and try different dates
Conception & Pregnancy Tips
LMP Method: Most common method - conception typically occurs 14 days after LMP
Due Date Method: Works backward from due date - conception is about 266 days before
Ovulation Window: Conception usually happens during a 6-day window around ovulation
Cycle Variations: Individual cycles may vary from the standard 28-day assumption
Accuracy: These are estimates - actual conception can vary by several days
Medical Confirmation: Ultrasounds provide more accurate dating, especially early in pregnancy
Planning Purposes: Use for general planning and understanding pregnancy timeline
Understanding Conception Dating
Conception Window: Sperm can survive up to 5 days, and eggs are viable for 12-24 hours, creating a conception window.
Calculation Methods: LMP method assumes 28-day cycles with ovulation on day 14. Due date method works backward 266 days.
Individual Variation: Actual conception dates may vary based on cycle length, ovulation timing, and individual factors.
Medical Disclaimer: This calculator provides estimates only. Consult healthcare providers for accurate pregnancy dating and care.