Ovulation Calculator

Menstrual periods are different from woman to woman and month to month. Use this calculator to see when you may be ovulating to help find your most fertile days.

Select the first day of your last period

AUGUST 2026
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First day of the week

How long is your average cycle?

  • 22
    DAYS

  • 23
    DAYS

  • 24
    DAYS

  • 25
    DAYS

  • 26
    DAYS

  • 27
    DAYS

  • 28
    DAYS

  • 29
    DAYS

  • 30
    DAYS

  • 31
    DAYS

  • 32
    DAYS

  • 33
    DAYS

  • 34
    DAYS

  • 35
    DAYS

  • 36
    DAYS

  • 37
    DAYS

  • 38
    DAYS

  • 39
    DAYS

  • 40
    DAYS

Your Cycle Is 31 Days

Fertile Window

FEB

22

Approximate OVULATION

FEB

22

Next Period

FEB

22

Pregnancy Test Day

FEB

22

Start Over

NOTE: This tool cannot and should not be used to prevent pregnancy. Results are estimates and actual ovulation will vary for each woman.