Calculate your fertile window, peak ovulation date, and future menstrual cycles.
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Ovulation & Fertile Window Result
Estimated Peak Ovulation Date
2026-10-20
Fertile Window (6 Days)2026-10-15 to 2026-10-21
Peak Fertility Days2026-10-18 to 2026-10-20
Next Period Start Date2026-11-03
Pregnancy Test Date2026-11-01
Upcoming Fertile Cycles Forecast
Cycle 1: Next Period 2026-12-01
Peak Ovulation: 2026-11-17 (Fertile: 2026-11-12 to 2026-11-18)
Cycle 2: Next Period 2026-12-29
Peak Ovulation: 2026-12-15 (Fertile: 2026-12-10 to 2026-12-16)
Cycle 3: Next Period 2027-01-26
Peak Ovulation: 2027-01-12 (Fertile: 2027-01-07 to 2027-01-13)
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Medical & Health DisclaimerThis calculator provides general educational estimates based on standard health formulas. Results are for informational purposes only and are not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider regarding a medical condition.
Fertile Window & Ovulation Formula
Ovulation Day = Next Period Date - 14 Days
In a standard cycle, ovulation occurs approximately 14 days before the start of the next menstrual period.
Variables Defined
Fertile Window:5 days before ovulation plus ovulation day (6 total days).
Peak Fertility:2 days prior to ovulation and ovulation day.
Example Ovulation Calculation
LMP June 1st with a 28-day cycle.
Given Inputs
Next Period Date:June 1 + 28 days = June 29
Ovulation Date:June 29 - 14 days = June 15
Fertile Window:June 10 to June 16
Calculation ResultPeak Ovulation = June 15th | Fertile Window = June 10-16
Frequently Asked Questions about Ovulation Calculator
