How do I know if my period is normal?


There is a wide variety of normal when you are talking about periods. There is a fallacy that if you don't get a period every 28 days it is 'not normal' - this is false. Only 15% of women get a period every 28 days.

  • Normal length of time between cycles can range from 21 to 40 days.
  • Normal duration of menses can be between 3 and 8 days.
  • Normal onset of menses (menarche) is age 9-17.
  • Average age of menopause in the US (no period for a year) is 51-52.
  • Most important is what is normal for you- if you see a dramatic change in the interval between periods, duration or flow you should alert your doctor right away.

MyMonthlyCycles Cycle Tools: Cycle Length Checker - View if you've tracked cycles less than 21 days or more than 40 days, and when. Period Length Checker - See if and when you've had periods shorter than 3 days or longer than 8.

Wendy Fried, M.D., FACOG, FACS, is an OB/Gyn with Northern Obstetrics and Gynecology, PC in North Hills, New York

Disclaimer: The information provided in this document is for educational purposes only. It is not medical advice and is not intended as a substitute for medical advice. Only your own physician knows all the important details of your specific medical and personal history and should be the only one to give you advice regarding your own medical care. You should never disregard medical advice or delay seeking medical advice or treatment because of something you have read herein. If you have any questions whatsoever about your medical health or believe you have a medical problem or disease, you should contact your medical doctor or healthcare provider.