Due Date Calculator - Conception, IVF, LMP
Calculate your baby's due date using multiple methods: Last Period (LMP), Conception Date, or IVF Transfer Date.
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We support methods for Natural, Conception, and IVF.
This tool provides general health information and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
Calculation Methods Explained
Last Menstrual Period (LMP)
The most common method. Adds 280 days to the first day of your last period.
Conception Date
If you know exactly when you conceived, we add 266 days (38 weeks).
IVF Transfer
Calculated precisely by adding 266 days to the transfer date, minus the embryo age (3 or 5 days).
Why Due Dates Change
Your due date might be adjusted after an early ultrasound. Ultrasounds in the first trimester are generally more accurate than LMP for dating the pregnancy because fetal growth is very consistent during this time.
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