Free online ovulation calculator — predict ovulation date from cycle length and last menstrual period.
Ovulation Calculator Online
100% Free • Instant Results • No Signup
Ovulation Calculator Online. Estimate ovulation day from last period. Fast, accurate, private.
Estimated ovulation
Fri, Jul 17, 2026
Fertile window is approximate (~5 days before + day after).
Fertile fromSun, Jul 12, 2026
Fertile untilSat, Jul 18, 2026
Steps
- Open the calculator
- Enter your values
- Read the result instantly
Related
FAQ
Are results official?
No — quick estimates only. Confirm with your bank or provider.
Is data saved?
No. Calculations run in your browser.
Where is the full tool?
Each satellite links back to the main hub calculator.