Basal Thermometers

Using a special thermometer to chart basal body temperature (BBT) is the foundation of any fertility chart. Why? Because only a basal thermometer can confirm that you have ovulated during your monthly cycle, allowing you to anticipate when you will be fertile during future cycles.

How does BBT charting work? During your monthly cycle, your resting (basal) temperature will remain low and stable during the first weeks of your cycle. However, when you ovulate the body produces the hormone progesterone which markedly raises your body temperature. By tracking when this BBT "thermal shift" takes place, you can determine when you are most likely to conceive a baby.

The benefits of using a basal thermometer are many: First, fertility charting allows you to accurately predict ovulation based on previous BBT patterns. Second, using a basal thermometer allows you to confirm that ovulation has indeed taken place and that you are ovulating regularly - and that your cycle is in balance (irregular BBT patterns can alert you to potential issues with your menstrual cycle). Cross reference your BBT thermal shift with other natural fertility signs (e.g., changes in cervical mucus) and ovulation testing methods and you’ll have a comprehensive picture of your fertility status!

Today, special BBT thermometers are specifically designed with unique features to help trying-to-conceive women chart their fertility easily and confidently. Read more about our ultra-accurate digital and glass basal thermometers below.