Pregnancy & due date
Calculate your estimated due date (EDD), current gestational age in weeks and days, and trimester from your last period.
Open calculatorOvulation & fertile window
Assumes a 14-day luteal phase, placing ovulation at (cycle length − 14) days after the first day of your last menstrual period (LMP). The fertile window covers the 5 days leading up to ovulation plus ovulation day itself.
Estimated ovulation date
2026-09-15
Fertile window starts
2026-09-10
Estimated due date (280 days)
2027-06-08
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Natural cycle timing varies from month to month — do not use calendar estimates as a method of contraception.
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Educational estimate only. Not medical, tax, legal or financial advice.