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Estimate a due date from a period, known ovulation, fertilization or reported ultrasound age.
Adults seeking a pregnancy-dating estimate from a known date or a clinician-reported gestational age.
EDD = LMP + 280 + (cycle days − 28); known ovulation or fertilization + 266 days; or scan date + (280 − reported gestational age in days). Gestational age on the explicit observation date is measured from EDD − 280 days. All arithmetic uses Gregorian calendar days in UTC.
Choose your units, then enter the details you want to use.
Complete the relevant fields and select Calculate. Changes to your inputs clear the previous result.
Educational estimates, with their equations and assumptions. They do not diagnose a condition or prescribe a treatment.