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Quick Answer: A gestational age calculator determines how far along a pregnancy is using four main methods: (1) Last Menstrual Period (LMP) – add 280 days to the first day of your last period for an estimated due date, (2) Ultrasound measurements – crown-rump length in first trimester provides ±5-7 day accuracy, (3) IVF embryo […]

Quick Answer: To calculate an IVF due date, add 263 days to your Day 3 embryo transfer date or 261 days to your Day 5 transfer date. The general formula is: transfer date + 266 days – embryo age at transfer. IVF due dates are more accurate than natural conception because the exact fertilization and […]