About Due Date Calculations:

• • Last Menstrual Period (LMP): The most common method, adding 280 days (40 weeks) to the first day of your last period.
• • Conception Date: Adding 266 days (38 weeks) to the estimated date of conception.
• • Ultrasound Dating: Based on measurements taken during an ultrasound, most accurate in the first trimester.
• • IVF Transfer: Specific calculations for in vitro fertilization procedures based on embryo age.

Note: Only about 5% of births occur on the exact due date. Most babies are born within a week before or after. A full-term pregnancy can range from 37 to 42 weeks. This calculator provides estimates only and should not replace medical advice from your healthcare provider.