Period Calculator | Track Menstrual Cycle and Ovulation

Calculate your next period, ovulation dates, and fertile windows with our free period calculator. Plan ahead with accurate cycle predictions.

Calculate Your Next Period & Ovulation Days

First Day of Last Period

Average Cycle Length (days)

Period Length (days)

Next 6 Cycles

Period Days	Ovulation Window
Apr 3 – Apr 7	Apr 17 – Apr 21
May 1 – May 5	May 15 – May 19
May 29 – Jun 2	Jun 12 – Jun 16
Jun 26 – Jun 30	Jul 10 – Jul 14
Jul 24 – Jul 28	Aug 7 – Aug 11
Aug 21 – Aug 25	Sep 4 – Sep 8

Cycle Information

Your average cycle length: 28 days

Period duration: 5 days

Fertility window: Typically 5 days before ovulation

Common Cycle Calculations

28-Day Cycle

Most common cycle length

28-day cycle with 3-day period 28-day cycle with 5-day period 28-day cycle with 7-day period

30-Day Cycle

Longer regular cycle

30-day cycle with 3-day period 30-day cycle with 5-day period 30-day cycle with 7-day period

32-Day Cycle

Extended cycle length

32-day cycle with 3-day period 32-day cycle with 5-day period 32-day cycle with 7-day period

Understanding Your Cycle

Menstrual Phase

The first phase of your cycle when bleeding occurs, typically lasting 3-7 days.

Follicular Phase

Starts on day 1 of menstruation and continues until ovulation.

Ovulation Phase

Usually occurs around day 14 in a 28-day cycle, lasting 24-36 hours.

Luteal Phase

The final phase after ovulation until your next period, typically 14 days.

Tracking Benefits

Family Planning

Track your fertile window for pregnancy planning or prevention.

Health Monitoring

Identify irregular cycles that might indicate health issues.

Lifestyle Planning

Plan activities and events around your cycle phases.

Symptom Management

Prepare for and manage cycle-related symptoms effectively.

Related Calculators

Ovulation Calculator

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Pregnancy Calculator

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About this Calculator