Ovulation Calculator

Use our precise Ovulation Calculator to predict your most fertile days. Calculations are based on standard fertility patterns recognized by medical institutions like FIGO.

Last Period Start Date

Cycle Length (Days)

Calculation Logic

Ovulation typically occurs 14 days before the start of the next menstrual cycle:

$$Ovulation Day = Last Period + (Cycle Length - 14)$$

Reference: International Federation of Gynecology and Obstetrics (FIGO) standards for menstrual cycle monitoring.

Frequently Asked Questions

How accurate is this calculator?

This provides an estimate. Individual cycles can vary due to stress, diet, or hormonal changes.

What is the fertile window?

The fertile window typically spans the 5 days before ovulation and the day of ovulation itself.