Pregnancy Due Date Calculator
Estimated due date, current week of pregnancy and trimester from your last period.
Ovulation & Fertile Window Calculator
Estimated ovulation day, fertile window and next period from your cycle.
Your result will appear here
Enter your measurements, then press Calculate.
Methodology
Luteal phase of 14 days; Wilcox fertile window (1995)
Ovulation ≈ next period − 14 days; fertile window = ovulation − 5 days to ovulation + 1 day
Pregnancy is most likely from intercourse in the 6 days ending on the day of ovulation.
- Who it is for
- Women with fairly regular cycles of 20–45 days.
- Version
- 1.0.0
Limitations
- Ovulation varies from cycle to cycle even in regular cycles; this is not reliable contraception.
References
- Wilcox AJ, Weinberg CR, Baird DD. Timing of sexual intercourse in relation to ovulation. N Engl J Med. 1995;333(23):1517–1521. doi:10.1056/NEJM199512073332301
Continue with your measurements
Shared measurements carry over automatically, in this tab only.