Around 12% of women between the ages of 15 and 44 have difficulty getting pregnant or struggle with infertility issues (source). With these statistics, it is pretty common to hear about these problems and where there are problems, there are products on the market to help solve them, hence basal thermometers.

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One of the most talked-about procedures is taking your basal temperature to determine ovulation. A basal thermometer is recommended for this process because a basal thermometer is an extremely sensitive thermometer and can sense the tiniest change in your body temperature. We recommend a basal thermometer because it is more sensitive than a regular thermometer and makes it easier to chart temperature fluctuations to determine ovulation.


Top 7 Best Basal Thermometers Review in 2020

1. iProven Clinical Basal Thermometer

Located in The Netherlands, with a warehouse in the U.S.A., iProven provides quality health care products that are clinically proven to meet the highest standards of durability, quality, and consistency.

The company’s goal is to not only provide quality health products but to provide ample knowledge of health conditions associated with each product. The more educated you are, the easier it is to maintain your health.

As one of the best basal thermometers for fertility, the iProven Clinical Basal Thermometer is accurate to 1/100th of a degree and is easy to use when you wake up. If you need to rush to the bathroom after taking your temperature, this thermometer records the last temperature so that you can record it later.

What We Liked
  • Turns on with one touch of the button, so that you can easily take your temperature the moment you wake up.
  • Can be switched between Fahrenheit and Celsius.
  • A basal temperature can be taken orally, rectally, vaginally, or axillary. So you can use any method recommended by your doctor.
  • There is no LED light or loud beep (only soft beep), so you are less likely to disturb your partner when taking your temperature.
  • Accuracy is +/- 0.10 C /0.20 F
What We Didn't Like
  • It only records one previous temperature.

2. iSnow-Med Multi-Functional Digital Basal Thermometer

Based in Hong Kong, iSnow-Med designs medical products for home and hospital care as well as pet care products.

The iSnow-Med Multi-Functional Digital Basal Thermometer is specifically designed to measure basal temperatures. It is genuinely one of the best basal thermometers for TTC (trying to conceive) on the market.

With an accuracy of +/- 0.05 C/ 0.09 F, this thermometer provides a soft backlight and large LCD screen to make it easy to track your basal temperature.

What We Liked
  • One of the most vital aspects of using the basal temperature method is taking your temperature at the same time each morning. With this in mind, the developers of this basal thermometer included an alarm that can be set to go off at the same time each morning. That way, even on the days you get to sleep in, you get your temperature at the same time.
  • Another feature that makes taking your temperature easier is its ability to record up to 60 recordings. This feature lists date, time, and temperature so that you can record in your ovulation at any time.
  • Automatically switches off after 60 seconds, saving on battery usage.
  • Includes an ovulation chart to record your temperature each morning.
  • Easily converts from Celsius to Fahrenheit
What We Didn't Like
  • Some consumers have stated that the beep sound is too loud and can disturb a light sleeper.

3. Best Digital Medical Thermometer

Generation Guard began as a family business when a couple could not find a baby thermometer that met all their expectations. After dealing with poor customer service from large companies, they invented their baby thermometer, and their product grew from there.

Their company goal is to provide 100% customer service and satisfaction and create health products that meet their high standards. The Generation Guard Basal Thermometer is designed specifically for tracking your basal temperature to determine your ovulation window. We highly think this is one of the best basal thermometers for NFP (natural family planning) on the market today.

*Note: Natural Family Planning is a method of natural birth control. NFP is often used by people who do not believe in other methods of birth control because of religious beliefs or other reasons. Though this is not the most accurate method, some women use it successfully.

What We Liked
  • Medically calibrated and tested to be accurate within +/- 0.05 F.
  • Waterproof to make cleaning more comfortable and safer for the thermometer.
  • Free BBT tracking chart included with your purchase.
  • FDA and European CE Approved.
  • Soft beeps that will not wake your partner.
What We Didn't Like
  • Only records the previous temperature so you must be efficient in recording your temperature into your temperature log.

4. Smart Basal Thermometer by Femometer

Bangtang is a startup company located in China. Their company mission is to provide health solutions for families using data collection – with a focus on children’s health and women’s reproductive health.

With an accuracy of =/- 0.09 F, the Smart Basal Thermometer by Femometer is one of the best basal thermometers for ovulation charting apps.

Simply download the Femometer App to your smartphone and sync the thermometer via Bluetooth. Your information is automatically sent to the app each time you take your temperature. With FDA, CFDA, CE, and CNAS certification, the Femometer has some of the best basal thermometer reviews.

What We Liked
  • The thermometer turns on and shuts off automatically when you take the cap off and put it on.
  • Stores up to 300 temperature readings so you can sync with the app any time.
  • Compatible with Apple and Android devices.
  • Other than temperature, this device keeps track of additional information that is useful when trying to conceive. These items are period records, LH test, sex, sleep, weight, medication, and emotion to provide a more accurate picture of your reproductive health.
  • No display or buttons, the information automatically updates in the app, so you can go back to sleep and read the results later.
What We Didn't Like
  • It only displays your information on their company app, so you must download the app.

5. Starlight and Sunny Basal Thermometer

The company began with a mom’s dream to provide her daughters with something tangible (eBooks} to guide them through life should something happen to her. The Starlight and Sunny family (not company) soon branched out into providing family and child-related products from their home in Canada.

The Starlight and Sunny Basal Thermometer is this family’s solution to family planning. This best-selling basal thermometer is used for planning or preventing a pregnancy – whichever meets your family’s needs at the moment.

What We Liked
  • It takes only 60 seconds to read temperature – most basal thermometers can take up to 120 seconds or longer.
  • The thermometer is waterproof for easier cleaning.
  • Accurate to within 1/100th of a degree.
  • Does not light up and the beep is soft so as not to disturb your sleeping partner.
  • Automatically saves the last temperature reading for later recording.
What We Didn't Like
  • Only records one temperature reading.

6. Digital Basal Thermometer

Perhaps one of the best digital basal thermometers available, the Digital Thermometer is an FDA approved fertility thermometer. It is designed to calculate your exact ovulation date as well as peak fertile days.

The Digital is more than a thermometer. It is a computerized digital basal thermometer and fertility monitor that does not have to be synced to an app to provide the needed information.

Once the necessary information is collected, Digital interprets your information and produces a personalized fertility prediction.

What We Liked
  • Equipped with an alarm that allows you to take your temperature at the same time each day – the best way to get an accurate picture of your reproductive cycle.
  • Interprets the data received, and after two cycles, can provide you with a fertility prediction.
  • Automatically displays the cycle day along with your previous ten readings.
  • Allows you to record and track other vital information – cervical mucus changes, cramping, and bleeding – for an even more accurate reproductive picture.
  • Accurately measures and records your basal temperature to within 1/10th.
What We Didn't Like
  • Only reads your temperature in Fahrenheit – Celsius reading is not available.

7. Premom Smart Basal Thermometer

The Premom Smart Basal Thermometer is an ovulation and period tracker that allows you to pinpoint your most fertile days. This information can be used to prevent pregnancy or show you the best time to get pregnant.

Download the Premom App, sync via Bluetooth, and you are ready to go. The app automatically charts your information and determines your ovulation date as well as your expected period date (Source).

Compatible with Apple and Android, this thermometer provides one of the easiest methods of charting your reproductive and menstrual cycles.

What We Liked
  • Accurate to within +/- 0.09 F/ 0.05C
  • Memory recall records up to 30 temperature readings with date and time
  • Gentle beep and large backlit display for easy reading in the dark
  • The thermometer uses a watch battery, with an estimated 3-month power life
  • So easy to use, you can take your temperature without waking fully and go right back to sleep, knowing the information is sent straight to the app
What We Didn't Like
  • If you want your information automatically recorded to the app once you take the temperature, you must remember to leave the app open on your phone.

How the Basal Temperature Method Works

The basal temperature method is commonly used by women to track ovulation – the period in which a woman is most fertile. Though each woman’s basal body temperature can vary between 96 and 98 degrees, each woman experiences a slight rise in body temperature when ovulating (Source).

This rise in temperature can be minuscule (between 0.4 to 0.8 degrees), so you need a very sensitive basal thermometer to get the most accurate temperatures. The time frame that you are most likely to become pregnant is within 2-3 days before your body temperature reaches its peak. Also, 12 to 24 hours after ovulation (ovulation is when your body temperature reaches its peak).

For this method to be successful, you must take your temperature at the same time each morning before you do anything, including going to the bathroom. To accomplish this daily regimen, store your thermometer and chart on a bedside table and take your temperature as soon as you wake up.

The causes of infertility include age (especially for women over 35), health problems such as Polycystic Ovary Syndrome (PCOS) and Primary Ovarian Insufficiency (POI), as well as lifestyle choices, such as smoking, alcohol use, stress, and eating disorders.

Before you begin to use any of the fertility methods and treatments, you must choose to control, if possible, any lifestyle issues that can affect your fertility. It is also a good idea to speak with your doctor and discuss the concerns you have and come up with a plan together to increase your chance of conceiving a baby.

Things to Consider When Choosing the Best Basal Thermometer

There are several things to consider when choosing the best basal thermometer for ovulation charting. Of course, accuracy is one of the most important aspects – your basal thermometer should be accurate to within 1/10th of a degree. Since you will be taking your temperature as soon as you wake up, is to have an alarm beep to let you know when the thermometer finished. One last consideration is memory recall. With this feature, you do not have to record your temperature into your chart immediately, but can go ahead and do your morning business, then record later.

Final Thoughts

Whether you are trying to get pregnant or prevent pregnancy, it is essential to have the best basal thermometer available. There are many to choose from, as you can see by my best basal thermometer reviews above.

Before I announce my choice, here are a few tips for accurate ovulation charting:

  1. The temperature must be taken at the same time each day – within 30 minutes before or after your previous reading.
  2. Take your temperature before you do anything. The basal temperature is your body’s resting temperature, and even small movements can affect the accuracy of your ovulation chart. So, wake up, reach for the thermometer, take temperature, then stretch or get out of bed.
  3. The most accurate basal temperature occurs after at least 3 or 4 hours of sleep.
  4. Use the same thermometer for the most accurate reproductive picture. If you need to purchase a new one, do not start using it until day one of your next menstrual cycle.

When deciding on the thermometer that I feel is the best basal thermometer for ovulation tracking, I considered the following – accuracy, convenience, and tracking ability. With these factors in mind, I feel the best basal thermometer is the Smart Basal Thermometer by Femometer.

Final Thoughts Continued…

While synced to the Femometer app, this thermometer provides information about your entire reproductive health. It is also FDA certified as a fertility tool that is accurate and safe. With or without the app, this smart digital thermometer can store up to 300 temperature readings that you can record at any time.

It is also easy to use – it turns on when you remove the cap, and it turns off when you replace the lid. So easy to use, you can almost do it in your sleep – and, since it is the first thing you should do in the morning, that is an absolute must.

Whether you are using your basal thermometer for TTC or NFP, this thermometer has all you need to get an accurate and complete picture of your reproductive health.