Period Calculator
Track your menstrual cycle, predict upcoming periods, and plan ahead with our free online period calculator.
Category: Fitness & Health
The average menstrual cycle is 28 days, but it can range from 21 to 35 days.
Period Calculator
Fill in your details and click Calculate to predict your upcoming periods and fertile windows.
Frequently Asked Questions
What is a normal menstrual cycle length?
A normal menstrual cycle typically ranges from 21 to 35 days, with the average being 28 days. The period itself usually lasts 3-7 days. However, what's 'normal' varies from person to person, and cycles can change throughout your lifetime.
Why is my period irregular?
Irregular periods can be caused by many factors including stress, significant weight changes, excessive exercise, hormonal imbalances, polycystic ovary syndrome (PCOS), thyroid disorders, perimenopause, or certain medications. If you're concerned about irregular periods, consult with a healthcare provider.
How can I track my period more accurately?
To track your period more accurately, record the start and end dates of each period, note any symptoms (cramps, mood changes, etc.), and track your cycle length. Using a period calculator or app can help identify patterns. For increased accuracy, you might also track other fertility signs like basal body temperature and cervical mucus changes.
When should I see a doctor about my period?
Consider seeing a doctor if you experience very heavy bleeding (soaking through pads/tampons every hour for several hours), periods lasting longer than 7 days, severe pain, periods less than 21 days or more than 35 days apart, bleeding between periods, or if you miss three or more periods in a row without being pregnant.