Homepage/Fertility Calculator/Natural Conception Due Date Calculator
Estimate the due date, current gestational age, and pregnancy trimester for natural conception based on the last menstrual period (+280 days) or a known ovulation date (+266 days).
Estimate the due date for a natural pregnancy based on the last menstrual period or known ovulation date.
Method A (Last Menstrual Period Method): Estimated Due Date = First Day of Last Menstrual Period + 280 Days.
Method B (known ovulation date): Estimated due date ≈ Ovulation date + 266 days.
Estimated due date, current gestational week and days of pregnancy, days until due date, and stage of pregnancy.
Estimates may be inaccurate if the menstrual cycle is irregular, the last menstrual period is uncertain, or ovulation occurs at a time different from conventional assumptions; first-trimester ultrasound helps confirm gestational age and the due date.
ACOG:Methods for Estimating the Due Date; NHS:Due date calculator
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