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Call the OWH HELPLINE: 1-800-994-9662
9 a.m. — 6 p.m. ET, Monday — Friday
OWH and the OWH helpline do not see patients and are unable to: diagnose your medical condition; provide treatment; prescribe medication; or refer you to specialists. The OWH helpline is a resource line. The OWH helpline does not provide medical advice.
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Ovulation calculator
Knowing the days you are most likely to be fertile can increase your chance of getting pregnant. The typical menstrual cycle is 28 days long, but each woman is different. There are about 6 days during each menstrual cycle when you can get pregnant. This is called your fertile window. Use the calculator to see which days you are most likely to be fertile.
Fertile Window Ovulation DateIf your period starts:
If your menstrual cycle is:
Your estimated fertile window is:
Your estimated ovulation date is:
You are most likely to get pregnant if you have sex without birth control a few days before your ovulation date.
This ovulation calculator provides an estimate of your fertile window and is not a guarantee of pregnancy or of birth control. The calculator and information on this website are not medical advice. Talk to your doctor or nurse to plan for pregnancy and find birth control that works for you.
Fertile windows are different for every woman and can be different from month to month in the same woman. Learn more about your fertility if you are trying to get pregnant.
Learn more about your fertility
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If you choose to provide us with information about yourself by using the ovulation calculator, we will not retain or store that information. If you use the "Email me my results" or "Save to my calendar" features, we will automatically send information you provide and the calendar results to the address or calendar locations you provide, but we will not retain copies of those results or of the emails you send. Please review our full privacy policy.
All material contained on these pages are free of copyright restrictions and may be copied, reproduced, or duplicated without permission of the Office on Women’s Health in the U.S. Department of Health and Human Services. Citation of the source is appreciated.
Page last updated: January 23, 2019.
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A federal government website managed by the Office on Women's Health in the Office of the Assistant Secretary for Health at the U.S. Department of Health and Human Services.
200 Independence Avenue, S.W., Washington, DC 20201
1-800-994-9662 • Monday through Friday, 9 a.m. to 6 p.m. ET (closed on federal holidays).
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