🗓️

Ovulation Calculator

Inputs

First Day of Last Period

Enter the date when your last menstrual period started

Average Cycle Length(days)

Typical number of days between the start of one period and the next

Ovulation Date

—

Your predicted ovulation day when egg is released

Fertile Window Start

—

Fertile Window End

—

Next Expected Period

—

Days Until Ovulation

—

Fertile Window Duration

—

Formula

Ovulation Day = Last Period Date + (Cycle Length - 14) days; Fertile Window = Ovulation Day ± 5 to 1 day