Planning a baby is exciting. But it could be overwhelming too.

Thankfully, today you can make it easier by tracking your fertile days

One of the ways to do that is to use a basal thermometer. These devices track the shifts in your body temperature that indicate ovulation. Thus, you can detect your fertile window and increase the chances of getting pregnant.

So, let’s take a look at 5 best fertility thermometers you can find on the market today and learn some tips on choosing the right one.

5 Best Fertility Thermometers Reviewed

iProven Fertility Thermometer BBT-271A

This compact device by iProven has all the basic functions you may expect from a top-rated fertility thermometer. It tracks your temperature fast and precisely. Plus, it’s incredibly easy to use.

The manufacturer suggests you take measurements before you sit up and get out of your bed, as moving can affect your basal temperature. If you’re concerned that the alarm sound may disturb your partner, don’t be: the iProven thermometer has a very soft and gentle signal that won’t interrupt the sleep of your significant other.

The device can memorize the last measurement and keep it for you until you write it down, which is also very convenient. 

And finally, you can switch between the Fahrenheit and Celsius scales, depending on what you prefer.

Pros Cons
Convenient and good-looking design You still have to write down your measurements
Has a soft beep The color choice is limited to pink only
Can switch between C and F temperature scales
Features memory recall
Easy-to-read display

 

Femometer Digital Basal Body Thermometer

If you want the best fertility thermometer that will do almost the whole job for you, the Femometer might be your choice. This BBT thermometer comes with a convenient app that will track the changes in your temperature and give you personalized predictions about your ovulation day.

So, all you need to do is to measure your temperature in the morning and then manually enter it into your app. The LCD has high contrast, so it should be easy to read the numbers even in darkness.

The Femometer has a soft and unobtrusive sound signal, so your partner won’t even notice it. Also, the device can use both C and F scales, so you can choose the most comfortable way of monitoring.

Pros Cons
Builds the chart based on your data and predicts ovulation in advance Doesn’t sync automatically
Features a high-contrast LCD  Measuring temperature takes a bit long
Can work with both C and F scales
Has a waterproof tip
Quiet sound signal

 

Easy@Home Smart Basal Thermometer

Another device with an app in this fertility thermometer review, the Easy@Home does literally everything. It can track all your cycle parameters and offer you accurate predictions through an easy-to-read app chart.

The device automatically syncs with the app via Bluetooth, but it can also keep up to 30 records in its memory if you don’t have the opportunity to sync them at once.

Another great feature is a backlit screen that allows you to take measurements even when it’s dark outside, without disturbing your partner with the light.

Pros Cons
Offers accurate measurements Taking the measurement may take a while
Allows you to track the whole cycle within the app Some users report loud sound signal
Automatic synchronization via Bluetooth
Can keep up to 30 records in the memory
Backlit display

 

Purple Safety Digital Basal Thermometer for Fertility Monitoring

Purple Safety is one of the best fertility thermometers with a simple design and great accuracy:

It offers you precise measurements up to 0.01 of a degree.

The device features a flexible waterproof tip, which makes it easy to clean and maintain the thermometer. Also, it has a high-contrast display for easy reading at any time of the day.

You need to track your measurements manually, but with the accuracy that this device can offer it won’t be difficult to point out your fertile window and the best day for conception.

Pros Cons
Convenient and easy to use You need to track your measurements by hand
Measures up to 0.01 degrees The display isn’t backlit
High-contrast display
Waterproof and flexible tip
Takes only 30 seconds to measure 

 

iProven Basal Body Thermometer BBT-113Ai

Another model by iProven in this review of top-rated fertility thermometers is pretty basic. Still, it delivers high accuracy and is sensitive to 0.01 of a degree shift.

The manufacturer suggests that you measure your basal temperature right after waking up to get the most accurate reading. That’s why the thermometer is equipped with a soft and quiet sound signal so that you won’t miss a day and won’t interrupt your partner’s sleep either.

The device can memorize the last measurement, so you can enter it into a chart — which is included in the package — when you have time for it.

Pros Cons
Sleek and easy-to-use design You have to track your data manually
Can record the last measurement May take up to 2 minutes to measure your temp
High-contrast and easy-to-read display
Quiet sound signal
High sensitivity and accuracy

 

What Is Basal Body Temperature and How Does It Change Throughout Your Cycle?

Basal body temperature is the temperature of the body in the resting state — that is, when you don’t perform any physical or intellectual activity. Typically, it’s the lowest temperature point within 24 hours.

That’s why, if you’re trying to find out when you are most likely to get pregnant, measuring you BBT should be the first thing you do in the morning. Any physical activity, including cuddling with your partner or getting off the bed, is likely to raise your BBT and twist the measurements.

Now, basal body temperature is affected by circadian rhythms, so it may change within 24 hours. In women, it’s also affected by the menstrual cycle, so there are some monthly fluctuations as well

Let’s see how exactly this happens.

In the follicular phase of the cycle, which starts on the first day of the menstruation and ends on the ovulation day, estrogen is the dominant hormone in the women’s body. During this phase, your BBT remains within the normal range, which is between 97 and 97.7F or 36.1 and 36.5C, respectively.

When ovulation occurs, progesterone takes the lead. This hormone helps make the uterine lining thicker so that the fertilized egg can stick to it. Along with that, the elevated plasma levels of progesterone increase your BBT by 0.4F or 0.2C

In women with a normal ovulatory cycle, this shift happens in 1-2 days and is followed by a period of little or no changes, which lasts about 10 days or until your next period.

So, basically, a peak in body temperature and a plateau 2-5 days after this peak indicate your most fertile days and increase your chances to conceive.

What Is a Basal Thermometer? Main Types Explained

As the name implies, a basal thermometer is a device used to measure your basal body temperature (BBT). It looks identical to a conventional thermometer, but there are several non-visual differences:

  • Higher sensitivity. Basal thermometers give you measurements with more decimal places so that you can notice even the smallest shift in your BBT.
  • Recording data. Almost all basal fertility thermometers can record your measurements and store them for some time. Besides, some models can easily store up to 1 month of data. 

Now, let’s briefly walk through the main types of BBT thermometers available on the market today:

  • Glass. Traditional mercury-free thermometers are still popular among some users and even have advocates among doctors. But the truth is, their downsides outweigh the only advantage — which is autonomous work without electricity. Glass thermometers are fragile, and their sensitivity may vary based on a lot of factors.
  • Digital. The most common type of thermometers today is digital. Such thermometers have a digital display and measure temperature automatically (you will know when it’s done by the sound signal). Digital thermometers are very easy to use but may have issues with battery life. Also, with most of them, you will still have to track the data manually.
  • Smart. Smart thermometers are basically digital thermometers that can be connected to a smartphone app. After the measurement is taken, the device automatically syncs with your app via Bluetooth — or, you may need to enter the result manually — and forms a chart with all your parameters. Also, smart thermometers often use AI algorithms to offer you personalized predictions. The only drawback is the price.

Whatever the type, a good fertility thermometer should be able to do its main job, so that’s what you should focus on when shopping. And as for other functions, it’s all up to your needs and your budget. 

How to Properly Track Ovulation with a Basal Thermometer

If you haven’t used this method of tracking your fertile window yet, things can get a bit confusing for you. Despite being one of the easiest, the BBT method still has a couple of nuances. So, here’s a quick step-by-step instruction that will help you do everything right:

  • Choose the proper time. To achieve maximum effectiveness, you should measure your BBT right after waking up and strive to do this at the same time every day.
  • Start with day one of your period. This will help sync your BBT fluctuations with the cycle and find out if you have any issues with your cycle, such as delayed ovulation or anovulatory syndrome.
  • Wait for patterns. After a couple of months of tracking your measurements, you will be able to see shifts in basal temperature and predict your most fertile days. That’s when you should try to conceive a baby.

To determine if you’ve succeeded, track your temperature until your next period. Typically, two weeks after the ovulation, your BBT will drop and your period will start. But if this didn’t happen 16-18 days after the ovulation, you’re most likely pregnant and may want to schedule an appointment with your doctor to confirm that. 

Advantages and Disadvantages of Using BBT Method for Conception

Tracking ovulation is the easiest and one of the most natural methods to increase your chances of conceiving. And just like other methods, it has its pros and cons, which will be listed below.

So, let’s begin with the good: 

  • Highly accurate. The BBT method can give you a 99% accuracy if you’re consistent and have a regular cycle.
  • Natural. No need to take pills or insert anything inside your body. Just place the thermometer under the tongue and wait a bit.
  • Cost-efficient. Basically, a thermometer and a chart to write down your measurements are the only things you need to use this tracking method.
  • Helps you understand how your body works. When you learn to determine the main temperature patterns and their correspondence to different stages of your cycle, it will be easier for you to notice if something’s not right and quickly address this issue.

Now, the cons:

  • Not universal. Tracking ovulation with a fertility basal thermometer might not suit women with irregular cycles or certain medical conditions.
  • Requires self-discipline. You need to track the changes every day to get the most precise results, with no exceptions.
  • Requires adjustment period. You should track at least a couple of cycles to understand the main patterns before you can actually use the BBT method for conception.

What to Look For in a Good Fertility Thermometer?

So, if you’re really determined to use basal temperature tracking as your primary method of conception, let’s define what can help you choose the best fertility thermometer to increase your chances:

  • Accuracy. This is the essential feature to look for in all basal thermometers. Your device should be able to indicate even the smallest shifts in your BBT to give you the whole picture about your fertility level. The best models on the market today can detect up to 0.01 of degree shifts, so that’s what you should aim for.
  • Source of power. To obtain the most precise results, you should use your thermometer daily. If it has non-rechargeable batteries, this might be challenging. The problem is that not many brands today offer rechargeable options, so you should either keep some extra batteries by your side or choose energy-efficient devices.
  • Memory feature. Even though some models can keep up to 30 records in their memory, most digital BBT thermometers still require you to write your data down yourself, which might be annoying for some users. If it’s your case, consider increasing the budget to buy a smart thermometer.
  • Durability. More expensive models are typically made of more durable materials which can make them last longer. Some users report that cheaper devices suddenly start taking measurements wrong or completely stop working within the first couple of months. It’s something to keep in mind.
  • Certification and approval. All basal thermometers today offer nearly the same level of accuracy. But if a device has approval from the FDA or other trusted organization, this might make its exploitation more psychologically comfortable.

“Almost all basal thermometers are waterproof, which makes it easy to clean and maintain them in good condition.”

Frequently Asked Questions

How efficient is the BBT method of tracking ovulation compared to others?

Basal body temperature tracking can give you about a 99% accuracy if you use it consistently throughout the year and have a regular cycle. However, women who have unprotected sex during their periods, as well as those who aren’t very committed to tracking BBT every day, may have lower accuracy.

Can I use a conventional thermometer?

Technically, you can use a conventional thermometer for tracking your fertile window. But basal thermometers for ovulation are specifically designed to detect even the smallest shifts in the temperature, while with a conventional thermometer, you may miss more subtle changes.

Does the BBT method suit women with irregular cycles?

Not really. If your cycle duration varies each time, it might be difficult to track the patterns in your BBT and link them to ovulation. That’s why women with irregular cycles should use more precise tracking methods — such as fertility monitors — that allow collecting hormonal fluctuations during the cycle.

What pills can affect basal body temperature?

Any birth control pills will do that. Obviously, you have to go off them if you’re planning a pregnancy. Along with that, taking antibiotics and painkillers, or having chronic inflammation processes, may warp the results. So, before using the BBT method, make sure that you’re perfectly healthy.

Conclusion

If done right, monitoring basal body temperature is one of the easiest ways to increase chances to conceive. Basal body thermometers are designed to help you track your fertile window with little to no effort.

But choosing the right one comes down solely to your needs. 

If you want a device that will do the job for you, including syncing data and building predictions based on your input, go for a thermometer with a smartphone app, such as the Easy@Home. This device will give you detailed information about your cycles and offer personalized recommendations on how to make the most of your pregnancy planning.

But if you want a cheaper alternative, just choose a regular digital thermometer, such as the iProven BBT-271A. Yes, you will have to record the data manually, and measuring your temperature may take a bit long, but the accuracy will remain the same.

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