What is basal body temperature (BBT)?
Basal body temperature is the lowest/best temperature your body will be at while you are resting. Usually your basal temperature will be measured using a basal thermometer right after you wake up and before you have done anything else. While this measurement is unlikely to be the true basal body temperature (BBT), it is difficult to take measurements while sleeping so this is usually the best measurement that can be taken.
Basal temperature is often measured in women who are measuring ovulation. Ovulation creates a sustained increase of at least .4 degrees Fahrenheit in PBT, so measuring BBT is a good way of determining whether ovulation is occurring. Since women also tend to have lower temperatures right before ovulation and especially higher temperatures afterwards, by charting BBT regularly, a woman can develop an overall sense of her ovulation pattern and develop the best chances of getting pregnant.
Some women also use ovulation pattern monitoring as a way to avoid pregnancy. While this method can be effective, it is much less likely to succeed than other birth control methods and is only advisable when pregnancy is not being actively avoided but only delayed, and when other birth control methods are undesirable for important reasons.
Best Basal Thermometer Reviews
Nuvertex Clinical Basal Thermometer
The basal body thermometer by Nuvertex makes predicting your ovulation effortless by making it easy to chart your basal body temperature. Whether you are measuring your basal body temperature to determine your ovulation patterns or to find changes in body temperature that indicate hormonal disorders, this effective thermometer can do the job for you reliably.
This basal thermometer has a clinical accuracy of 1/100 degree Fahrenheit so you can feel confident of an accurate reading every time. The beep indicates that the test is completed so you don’t have to wonder whether your thermometer had long enough to work, even if you are measuring by yourself. The basal body thermometer is very sensitive, and is waterproof for your convenience.
The clear LCD display makes it easy to use even early in the morning or when you may not have your corrective lenses on yet. To use this convenient thermometer, all you have to do is put the basal thermometer under your tongue, close your mouth tightly, and press the power button. That’s it, easy to do first thing in the morning.
- Clinical accuracy of 1/100 degree Fahrenheit
- Beep indicates that the test is completed
- Clear LCD display
- Does not have backlit display for night time reading
- Button to push for reading is hard to find in the dark
- Memory function is not always effective
Femometer – Smart Basal Thermometer
For a thermometer that can let you skip recording your readings in a little book by your bed, and instead lets you take your basal body thermometer readings into the smartphone age with you, consider this clever and innovative thermometer by Femometer.
This cute little pink thermometer can sync your BBT to an app on your smartphone so that you can track and chart your BBT easily using the intuitive app. The app will intelligently analyze your BBT and automatically calculate your pregnancy rate every day so you can take the guesswork out of pregnancy, contraception, and early-stage pregnancy monitoring.
This thermometer is compatible with Apple and Android devices so you can have all of your results accurately available to you no matter your smartphone. With an accuracy of 0.09 degrees Fahrenheit, this thermometer can make you feel confident that your readings are accurate and consistent at this crucial time of your life.
The cutting edge technology of this app allows the tiny measurements monitored by the thermometer to be converted into data that is easy for you to understand. This thermometer is easy-to-use by simply taking the cap on and off, and it can store up to 300 BBT data so you can sync with the app at your convenience.
- Sync your BBT to an app on your smartphone
- Automatically calculate your pregnancy rate every day
- Compatible with Apple and Android devices
- Tiny measurements monitored by the thermometer converted into easily understood data
- Sometimes it takes more effort to get app to link than it would have been to write information on chart
- It is difficult to put the cap back on and possible to put it on backwards
- Does not respond well to multiple readings a day
- App’s English has translation issues
iSnow-Med Digital Basal Thermometer
For a very easy to use basal thermometer with a backlit display that you can see clearly in the dark, consider this innovative thermometer by iSnow-Med. Most digital thermometers utilize infrared technology to provide a fast measurement. These fast measurements are not as accurate as a high accuracy temperature sensor that detects temperature step by step like this thermometer.
This thermometer will even wait 10 seconds after achieving peak temperature to alert you to a finished reading. While this thermometer will take longer than competition, it is designed to be more accurate, not just when used in ideal conditions, but under the real-life conditions of waking up first thing in the morning.
This digital basal thermometer takes the time to ensure that the reading is accurate and not affected by things like you accidentally opening your mouth during reading or anything else. This thermometer can store up to 60 days memory with both temperature, date, and time, so you can write down your data even if you have let it go for a few days.
While it is better to record data as soon as it is captured, this thermometer takes into account the real life conditions under which you may not remember to record your readings. The accuracy to 1/100 of a degree will make you feel confident of this thermometers readings. It is also equipped with a chart that you can access for 30 days so that your ovulation day is clearly marked for the easiest reading imaginable.
- Backlit display
- Takes the time to ensure that the reading is accurate
- Works better in real life conditions than competition
- Accuracy to 1/100 of a degree
- thermometer works too slowly for some users
- shape and design are not ergonomic to use or comfortable under the tongue
- probe is larger than competing thermometers and less comfortable in the mouth
How to track your basal body temperature
Tracking your basal body temperature can teach you a lot about your body’s patterns and ovulation rhythm. While it is not difficult to track your basal body temperature, it is important that you are consistent and track in the same way every day.
When charting your BBT, you should try to take your temperature as closely as possible to the same time every morning. If you are a person who is accustomed to getting up at very different times, this may take some adjustment for you as you become accustomed to waking up to an alarm at the same time everyday.
It is important that you take your temperature the second that you wake up after sleeping steadily all night. Your temperature should be taken before you move around, so if you are waking up naturally try to think about it before you shift a lot in bed. Be in the habit of recording your temperature right after you take it, so you never make a mistake with the measurement.
Keep a little book with the thermometer by your bed so that you can easily record temperature the second you wake up. No matter how you decide to take your temperature, be consistent and take it in the same manner every time.
How to take accurate basal body temperature
For an accurate basal body temperature reading it is essential that you have an accurate and consistent thermometer. A digital BBT thermometer can provide a quick reading and beeps when it is finished recording your temperature so you can feel confident that it has had enough time even if you are measuring by yourself.
The Easy-to-Read screen will make reading and recording your temperature an easy part of your morning routine. The last thing you want to deal with first thing in the morning when you are tired and blurry eyed after your alarm has gone off, is a tiny, difficult to read screen.
While some thermometers have a feature to store your readings, it is advisable to enter the data yourself so that you can be certain you will have it even if something should happen to your thermometer’s data storage system. Once you’re in the routine of taking your temperature every morning with an accurate, easy to use basal body temperature thermometer, it will feel like just another part of your morning routine.
It is essential that you keep your thermometer by your bed with your data entry system. Getting up to retrieve the thermometer if you forget and leave it across the room will skew your readings. While measuring your temperature is not difficult, it may be difficult to maintain the routine of having the thermometer near you and measuring your temperature at the same time after a solid block of sleep lasting more than 4 hours every day.
What to look for when buying a BBT thermometer
Buying a BBT thermometer is an important purchase, since measuring your basal body temperature rhythms is a long-term, time-consuming process and it would be extremely frustrating to have your efforts wasted by an inaccurate thermometer.
Furthermore, since this thermometer is something that you will be using every day and part of your daily routine, it is essential that you choose a thermometer that will meet all of your needs and be easy and comfortable for you to use.
There is a compromise between quick readings and accuracy, but while you may feel confident that you value accuracy over speed, you may find that in reality a thermometer that takes up to a minute and a half to read your temperature will deter you from actually taking the measurement. Many people read their thermometers in the dark, so choosing a thermometer with a good backlit display is extremely important for ease of reading.
Some thermometers can communicate with your smartphone so that your data will be automatically backed up. There is some risk that data will not be as accurate or may be lost using this method, but if you are already on the fence about measuring your BBT, such convenience factors may be worth it to you.