Ovulation & Fertile Window

Predicts the ovulation day, six-day fertile window and next period from cycle dates, fully supporting Ethiopian calendar input with results shown in both calendars.

What you enter

• Calendar
• First day of last period
• Average cycle length (days)

Reference

Calendar method, ovulation ≈ 14 days before next menses

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All 63 clinical calculators

Educational decision-support tools. They do not replace clinical judgment, local protocols or specialist advice: verify results before acting on them.