Ovulation calculator: figure out your most fertile days
Knowing when you ovulate helps you understand your fertile window — and when you have the highest chance of getting pregnant. Enter the first day of your last period and your typical cycle length below.
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This is a general estimate from typical cycle math, not personalized medical advice — actual timing varies person to person and cycle to cycle. Nothing you enter here is saved unless you create a Masik account.
Want this tracked automatically, cycle after cycle? Create a free Masik account. Or read more about how the fertile window works.