Ovulation Calculator
This Ovulation Calculator helps you estimate your ovulation day and fertile window based on your menstrual cycle information.
Ovulation Calculator
Your Birthdate:
Are you calculating for yourself?
Purpose:
First day of your last period:
Cycle length (days):
28 days
Period length (days):
7 days
Ovulation Formula
Ovulation day = cycle length − 14
Parameters Explained
- Cycle length: the total number of days in your menstrual cycle
- 14 days: the average length of the luteal phase after ovulation
How It Works
The calculator estimates ovulation by counting back 14 days from the expected start
of your next period, helping identify the most fertile days in your cycle.
