Ovulation Calculator
Calculate ovulation day, fertile window and due date from last menstrual period
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📊 Result Chart
About Ovulation Calculator
Ovulation Calculator is a free online tool. Calculate ovulation day, fertile window and due date from last menstrual period and cycle length. Works on mobile and desktop, all calculations run locally in your browser for privacy.
Ovulation Calculator in 3 steps
- Enter the first parameter
- Enter the second parameter
- Click "Calculate" to see the result
Is this tool accurate?
Results are computed with standard, industry-accepted formulas for Last Period Date and Cycle Length calculations.
Do I need to download anything?
No, it runs entirely in your browser. No downloads needed.