BBT Charting

How Basal Body Temperature Works as an Ovulation Calculator

Basal Body Temperature (BBT) is your body temperature at rest, and can only be accurately taken immediately when you wake up. BBT rises after ovulation, due to increased Progesterone released from the corpus luteum after ovulation. Ovulation can be detected on a BBT chart for the day before the BBT rises. BBT remains high if there is a pregnancy. An increase of 0.5-1ºF indicates the BBT spike, and occurs hours after ovulation. The purpose of tracking and creating a BBT chart is to find the BBT spike. Traditionally, women take their body temperature and manually mark the reading on a...

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