Ovulation Calculator
Estimate an ovulation date and fertile window from the first day of the last period and usual cycle length.
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Estimated ovulation date
June 15, 2026
This calendar estimate cannot confirm ovulation and is not reliable contraception.
Estimated fertile window: June 10, 2026 to June 16, 2026. Cycles can vary even when they are usually regular.
These results are educational estimates, not a diagnosis or treatment plan. For personal medical advice, pregnancy guidance, chronic conditions, eating concerns, or medication decisions, speak with a qualified health professional.
How to use this result
Use the estimate as a starting point for learning and planning. Recheck the inputs, compare the result with how you feel day to day, and ask a qualified professional before making major changes to diet, exercise, medication, or pregnancy-related decisions.