Basal Thermometers

A basal body temperature (BBT) thermometer and a normal (or “fever”) thermometer are used for different purposes and have varying degrees of sensitivity. A BBT thermometer measures your basal body temperature, which is the body’s temperature at rest. It’s often used in fertility tracking because a woman’s BBT can rise slightly after ovulation. BBT thermometers are designed to measure very slight changes in temperature, typically to within 1/100th of a degree. A normal or fever thermometer, on the other hand, is used to detect fever by measuring body temperature to within 1/10th of a degree. This is usually sufficient for detecting fever but may not be sensitive enough to accurately track the small changes in BBT used for fertility tracking. If you’re using temperature tracking as part of your fertility and ovulation tracking, a BBT thermometer provides more precise readings.

You should start using a basal body thermometer from the first day of your menstrual cycle, which is the first day of your period, and continue every day throughout your cycle to accurately track your basal body temperature changes.

Yes, basal body thermometers are accurate for tracking subtle changes in BBT when used correctly. They are designed to measure temperature with precision, typically to within 1/100th of a degree, allowing for detailed monitoring of BBT throughout your menstrual cycle. Consistent and proper usage is important to maintain accuracy. Our products come with simple and detailed instructions, so you can easily use BBTs in your fertility journey.