Due Date Calculator
Estimated due date, gestational age, and trimester from your last period.
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Your Results
Estimated due dateOctober 22, 2026
Gestational age32 weeks 1 days
TrimesterThird trimester
Naegele's rule assumes a 28-day cycle. Ultrasound dating is more accurate.
Frequently Asked Questions
How accurate is a due date from LMP?
Within about a week, assuming regular 28-day cycles. A first-trimester ultrasound is the most accurate dating method.
Why adjust for cycle length?
Ovulation shifts with cycle length. Longer cycles push the due date later; this calculator adjusts proportionally.
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