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Our ovulation calculator helps to know your most fertile days. You need to just tell us the first day of your last menstrual period and average length of menstrual cycle.

When is the first day of your last period?

January February March April May June July August September October November December 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 2025 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045

What is the average length of your menstrual cycle? 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

Note: This tool helps you to calculate approximate fertile days assuming regular menstrual cycle. If you have irregular menstrual cycle, it may be difficult to calculate.