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Period & Ovulation Tracker

Predict your next periods, fertile windows, and understand your cycle phases.

First Day of Last Period

Cycle Length (Days)

Period Length (Days)

Cycle Facts

A typical cycle is 28 days, but 21-35 days is considered normal. Ovulation usually happens ~14 days before your next period starts.

Understanding the Period Calculator

Predict your next period, understand your cycle phases, and track ovulation. Helping you stay prepared and in tune with your body's natural rhythm.

Guide

How to use the Period Calculator

1Enter the 'First Day of Last Period' using the calendar picker.
2Set your average 'Cycle Length' (default is 28 days).
3Adjust the 'Period Length' if known.
4Instantly view your predicted dates for the next period, ovulation, and fertile window.

Applications

Common Use Cases

Planning: Know when your next period arrives for vacations or events.

Conception: Identifying your most fertile days to increase chances of pregnancy.

Health Awareness: Tracking cycle regularity.

The Maths Behind the Calculation

Next Period = Last Period + Cycle Length

We add your average cycle length to the start date of your last period. Ovulation is estimated to occur 14 days before the start of the *next* projected period.

Knowledge Base

Frequently Asked Questions

Is the ovulation date exact?

Ovulation prediction is an estimate based on averages. Stress, illness, or hormonal changes can shift your actual ovulation day.

What is a normal cycle length?

A normal menstrual cycle can range from 21 to 35 days. It is counted from the first day of one period to the first day of the next.

What is the fertile window?

The 6-day window ending on the day of ovulation when pregnancy is most likely to occur.

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