Period Tracker

Predict your next period, fertile window, and ovulation date based on your cycle length.

Educational Use Only

This tool is for informational purposes only and is not medical advice. Cycle lengths vary naturally. Consult a healthcare provider for medical concerns.

Your Cycle Details

Last Period Start Date

Average Cycle Length (days)

Average Period Duration (days)

Next Period

Sun, Sep 27, 2026

In 23 days

Ends: Oct 1

Fertile Window

Sep 8 – Sep 14

Days 9–15 of cycle

Highest chance of conception

Ovulation

Sun, Sep 13, 2026

Day 14 of cycle

Peak fertility day

Next 3 Cycles Forecast

Cycle 1

Period: Sep 27 – Oct 1

Fertile: Sep 8 – Sep 14

Ovulation: Sep 13

Cycle 2

Period: Oct 25 – Oct 29

Fertile: Oct 6 – Oct 12

Ovulation: Oct 11

Cycle 3

Period: Nov 22 – Nov 26

Fertile: Nov 3 – Nov 9

Ovulation: Nov 8

Period Tracker

Our Period Tracker helps you predict your next menstrual period, fertile window, and ovulation date based on your average cycle length. Track patterns over time to understand your body better.

How It Works

The calculator uses your last period start date and average cycle length to project upcoming cycles. Ovulation typically occurs around day 14 of a 28-day cycle, and the fertile window spans the 5 days before ovulation plus the day of ovulation itself.

Understanding Your Cycle

Menstrual Phase (Days 1–5): Period bleeding. Day 1 is the first day of your period.
Follicular Phase (Days 1–13): Hormones rise, preparing an egg for release.
Ovulation (Day 14): An egg is released. Peak fertility.
Luteal Phase (Days 15–28): The body prepares for potential pregnancy.

Important Note

Cycle lengths naturally vary from 21 to 35 days. Stress, illness, and lifestyle changes can all affect timing. This tool provides estimates only — not medical advice.

Our Period Tracker helps you predict your next menstrual period, fertile window, and ovulation date based on your average cycle length. Track patterns over time to understand your body better.

How It Works

Understanding Your Cycle

Menstrual Phase (Days 1–5): Period bleeding. Day 1 is the first day of your period.
Follicular Phase (Days 1–13): Hormones rise, preparing an egg for release.
Ovulation (Day 14): An egg is released. Peak fertility.
Luteal Phase (Days 15–28): The body prepares for potential pregnancy.

Important Note

Cycle lengths naturally vary from 21 to 35 days. Stress, illness, and lifestyle changes can all affect timing. This tool provides estimates only — not medical advice.