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Ovulation Calculator

Predict ovulation date and fertile window for the next few cycles.

Privacy-first workflows
Fast and simple
100% Free, no signup
Most cycles are 21–35 days; the average is 28.
Cycle 1
Period start11 Jun 2026
Fertile window20 Jun 2026 → 26 Jun 2026
Likely ovulation25 Jun 2026
Next period expected9 Jul 2026
Cycle 2
Period start9 Jul 2026
Fertile window18 Jul 2026 → 24 Jul 2026
Likely ovulation23 Jul 2026
Next period expected6 Aug 2026
Cycle 3
Period start6 Aug 2026
Fertile window15 Aug 2026 → 21 Aug 2026
Likely ovulation20 Aug 2026
Next period expected3 Sept 2026
Note: Ovulation calculators are statistical estimates. Cycle irregularities, stress, illness, or hormonal changes can shift ovulation. Consult a doctor for fertility planning.
How it works

How to use the ovulation calculator

STEP 01
Enter the first day of your last period.
STEP 02
Set your average cycle length.
STEP 03
See ovulation date, fertile window, and next period for each upcoming cycle.
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FAQ

Common questions