Basal Body Temperature Chart 1
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H e a lt h y P r e g n a n c y

Basal Body Temperature Chart
Use a basal body thermometer (available at most pharmacies) to take your basal body temperature ( BBT) as soon as you awake in the
morning. Plot your BBT as a dot on the graph for each day in your menstrual cycle. Connect the dots with a line from day to day so
you can see a pattern. The pattern may vary from cycle to cycle, but over time you will begin to see when you tend to ovulate.


After ovulation, you'll see a spike in your temperature ranging between 0.5 and 1.6 degrees. You are most fertile two to three days
before you ovulate and for about 12 to 24 hours after ovulation.

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Content last updated July 15, 2010.
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U.S. Department of Health and Human Services, Office on Women’s Health