Home » Calculators » Ovulation Calculator

Ovulation Calculator

Ovulation usually happens about 14 days before your next period. Enter the first day of your last period and your cycle length to estimate your ovulation day and your fertile window.

\u2014Estimated ovulation day
\u2014Fertile window starts
\u2014Fertile window ends

How to use

  1. Enter the first day of your last period.
  2. Enter your usual cycle length in days.
  3. Click Calculate to see your ovulation day and fertile window.

Related tools

🕐

Age Calculator

Get your exact age in years, months, days and total days lived.

🕐

Percentage Calculator

Solve any percentage problem: X% of Y, ratios and % change.

📊

EMI Calculator

Work out your monthly EMI, total interest and total payment.

💪

BMI Calculator

Find your Body Mass Index and health category in seconds.