The 5 Best Basal Thermometers of 2019

Are you looking for an inexpensive way of tracking your ovulation? Have you heard about basal thermometers, but not sure if they’re reliable?

Tracking your basal body temperature is one of the least expensive, yet reliable, ways of monitoring your cycle. Whether you’re looking to get pregnant or trying to avoid it, tracking your body temperature is a big part of natural family planning.

So, if all it takes is tracking your temperature, why can’t you just use a conventional thermometer? Today, we’ll answer that question as well as how to do it, what to look for, and if a basal thermometer is for you.

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What Is Basal Body Temperature (BBT)?

Basal body temperature (BBT) indicates the lowest body temperature within 24 hours (source). Now, you can’t just measure this at any given moment when you’re feeling colder. To get a correct reading, it has to be the first thing you do when you wake up.

As soon as you wake up and go to the bathroom, drink a glass of water, or perhaps enjoy a cuddle with your partner, your temperature rises. If you were to do just one of these activities before measuring your temp, it would be incorrect.

Before ovulation, your basal body temperature will be within the 97.0 to 97.7 F range. After ovulation, your BBT increases by a few tenths of a degree and will stay high until your next period. In other words, your cycle is divided into two parts: the first half is the cooler follicular phase, and the second half is the warmer luteal phase.

Separating the two is the temperature shift that marks ovulation.

Before you ovulate, the high levels of estrogen in your body keep your BBT low. After ovulation, the body quickly begins to produce more progesterone. By looking for a sustained temperature rise for at least three days, we can confirm that you have ovulated and the body has moved onto the second phase of the cycle.

What Is a Basal Thermometer?

A basal thermometer looks and works very similarly to a conventional thermometer. However, they’re much more sensitive and can, therefore, measure smaller changes in your BBT (source).

For example, a conventional thermometer may give you a reading of 98.23 degrees Fahrenheit. The basal thermometer, on the other hand, would read 98.235 degrees Fahrenheit, giving you more decimal places and therefore a more accurate reading.

Can I Use My Conventional Thermometer?

Some argue that to get a correct reading of your BBT, all you need is a reading to the tenth degree. This is, of course, what you would get with pretty much any thermometer.

This might be enough for you if you’re not necessarily trying to conceive right away, or you’re just curious.

That said, if you want the best results, experts agree that you’ll need a thermometer that’s more sensitive. The temperature changes are small, and you might miss them with a less sensitive thermometer. If you have an irregular, short, or long period, it can be extra difficult to predict your ovulation and an accurate thermometer is a must (source).

Another reason to choose a basal thermometer is that many can store your readings. This way, you can wake up, take your temperature and then go back to sleep. Then later in the day, you can write it down, or sync it with an app.

Why Track Your Basal Temperature?

Ovulation occurs when the ovary releases an egg. The site of rupture left behind on the ovary is called the corpus luteum, and it starts producing progesterone, which is responsible for the increase in temperature.

Once you see a sustained rise in body temperature, it’s highly likely the egg has been released and has already died. You then move into the luteal phase, and can’t fall pregnant for the rest of the cycle. Ultimately, conception will occur when intercourse happens in the few days before ovulation.

If you’re using this method as contraception, keep in mind that semen can live inside a woman’s body for up to five days (source). Combine this with the fact that the released egg can live for 24 – 48 hours, and you have a roughly 6-day fertile window before and including ovulation day in which you could fall pregnant.

If you’re using this method to conceive, thermometers can confirm that ovulation has already taken place in a cycle, but only after the fact. Once you see a temperature rise, your chances of conception are very low, since there is no egg.

Whether trying to conceive or trying to avoid, it is best to use basal body temperature thermometers with other symptoms, such as cervical fluid, vaginal secretions or cervical position (source).

What to Look For

Basal thermometers come in all shapes and sizes. Some are high-tech and high-priced, while others look very normal.

Here are a few different types:

  • Digital: These basal thermometers have a small display showing you the reading as well as an on/off button.
  • Glass: Most doctors argue that glass basal thermometers will give you the most accurate reading. These are fairly easy to use, and you won’t have to worry about battery life.
  • Smart basal thermometers: These are the new competitors on the market. They often offer you a basal thermometer with a compatible app. These won’t look like a conventional thermometer, and they might be expensive.

When buying a basal thermometer, you should consider your needs, the accuracy, and your budget. These can be more expensive than regular thermometers, but if you’re trying to conceive, you’ll need that accuracy.

When shopping around, it seems that many women today tend to prefer digital models. However, if you’re thinking about buying a digital one, there are some things to consider beforehand:

  • Accuracy: This is a crucial feature. You’ll need one that will give you a reading to one-hundredth of a degree. If you buy one that will only give you a tenth, it won’t be sufficient for charting.
  • Batteries or rechargeable: Considering that you’ll be using the thermometer every day, so the batteries may not last long. Since there aren’t many on the market that are rechargeable, look for one that is energy efficient.
  • Good quality: Digital basal thermometers seem to tend to stop working suddenly. Poor quality basal thermometers might fail after a month or so, but if it’s of good quality, this is less likely to happen.
  • Memory feature: This is a make or break point for me. Sometimes, life gets hectic and you won’t have time to write down your BBT. Unless you have a perfect memory, a memory feature is essential.
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The Best Basal Thermometers of 2019

Basal thermometers are in many ways an essential to keep on your bedside table. They will work as a tool to help you conceive, as well as an all-natural contraception. Now that we know what to look for, let’s look at the best basal thermometers available.

1. iProven Digital Basal Thermometer

Basal Body Thermometer BBT-113Ai - Temperature Tracking for Waking Temps - For...
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High-tech equipment can often be overwhelming — but simple digital basal thermometers are excellent alternatives to the smart technology out there. These are some of the most popular choices today and for good reason. They’re super easy to use and will generally provide you with precise and fast results.

For the best digital basal thermometer, we’ve chosen this cute little thermometer from iProven.

As I mentioned earlier, to get the best results, you need a sensitive thermometer. This one is ultra-sensitive, giving you a precise reading to one-hundredth of a degree. It’s not the fastest, but definitely not the slowest, providing results in about a minute.

When it’s finished its reading, it will make a beeping noise. But iProven states that it’s soft and shouldn’t wake any co-sleepers. This is one problem you often find with digital thermometers: the beep is too loud.

One thing that stood out to me was what iProven includes in the package. Besides the thermometer, you get a step-by-step guide as well as a temperature chart. I always prefer having a chart to write on as opposed to an app — it’s just easier for me.

The temperature chart will give you an overview of your cycle. This will help you identify your fertile window and assist your doctor in spotting any issues.

That said, if you’re not into pink, then this might be a little overwhelming. iProven designed everything in this package to be cute and feminine.

Pros

  • Easy to use.
  • High precision.
  • Soft beep.
  • Easy to read display.
  • An all-inclusive, good value package.

2. DIHEA Basal Thermometer

DIHEA Basal Thermometer – Soft Tip Ovulation Thermometer – High Accuracy...
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Unfortunately, not all of us have the luxury of being able to splurge our hard-earned cash on basal thermometers. Sometimes the high-tech, smart thermometers do come at a jaw-dropping price, and I find them too expensive. Fortunately, there are many options for people like us.

Being on a budget-thermometer hunt has never been this easy. For a very reasonable price, this basal thermometer from DIHEA is FDA-approved, easy to use, and accurate.

This thermometer looks nothing out of the ordinary. It features a small LCD screen that shows the reading, and an on/off button.

As you take your temperature, it will beep to indicate the ready results. However, it’s pretty slow, as it will take over two minutes for an accurate reading. That said, for a budget-friendly basal thermometer, it’s not bad.

The DIHEA basal thermometer is all about your comfort. The tip is soft and flexible, and it’s comfortable to keep in the mouth.

One neat feature you probably didn’t think would be included, is the memory recall. So, even when you disrupt your beauty sleep at the break of dawn, you can slip right back and log in the results later.

However, don’t forget to recall the last reading before you retake your temperature. It won’t remember more than one, and missing a temperature could throw your chart off.

Pros

  • Budget-friendly.
  • FDA-approved.
  • High accuracy.
  • Easy to use.
  • Memory recall.
  • Soft tip.

3. Smart Fertility Tracker from iFertracker

iFertracker - Smart Fertility Tracker
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The best time to test your basal body temperature is during sleep, when your body is resting. Thus, wearable basal thermometers are perfect if you tend to forget, or like me, can be a bit lazy. These will usually track your basal body temperature while you’re sleeping and inform you of the results when you wake up.

If you do opt for a wearable, be sure to pick one that is reliable and comfortable to wear.

Wearing a basal thermometer might seem odd. But with this high-tech, sleek looking model from iFertracker, you won’t notice.

Before you go to bed, place the sensor under your armpit. From here, it will record your temperature throughout the night.

One feature that I’m sure you’ll love is its thorough readings. During the night it gathers 20,000 temperature data points that you can look at through the app in the morning.

After pairing the sensor with the app, it will send all of the data automatically to your phone. However, since we sometimes tend to forget things, the sensor has a flash memory of 240 hours.

An additional feature that we can’t leave out is the sleep analyzer. The sensor will not only track your temperature but also how you sleep. How cool is that?

That said, the battery life of the sensor needs some improvement. If you wear it every day, like you’re supposed to, it will indicate “low battery” within a month.

The app also still requires some work, although it has already made vast improvements.

Pros

  • Comfortable to wear.
  • Reliable results.
  • Tracks temperature and sleep quality.

4. Easy@Home Smart Basal Thermometer

Easy@Home Smart Basal Thermometer, Large Screen and Backlit, Ovulation and...
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Who doesn’t love a bit of smart-technology to help life run a little smoother? Technology has taken us far — in the past, you’d have to visit the doctor’s office to track your ovulation. Nowadays, pretty much all you need is a pocket-size device.

But although there are countless smart basal thermometers out there, not all are worth your time.

This smart basal thermometer from Easy@Home is well worth your time. The thermometer itself features a small, backlit screen displaying your results, which then sync to an app on your phone.

The basal thermometer has a high precision — it will measure down to the hundredth degree. Additionally, it will let you choose between Fahrenheit and Celsius.

This smart thermometer comes with the Premom app, compatible with both iOS and Android. When you create your account, it will give you unlimited cloud storage for all your recordings.

As you take your temperature in the morning, the results will seamlessly sync with your app. Even still, remember to connect the thermometer to your phone before you take your temperature. Otherwise, the results won’t sync automatically.

Once inside the Premom app, your data will be analyzed to give you an accurate fertility window. Following a month or so where it gets used to your regular cycles, the app will predict and even give you a warning before you ovulate.

However, the battery seems to run out rather quickly. For everyday use, it’s not very convenient.

Pros

  • Smart technology.
  • Easy to use — syncs automatically.
  • High precision.
  • Great app.
  • Reasonably priced.

5. Geratherm Basal Mercury Free Thermometer

Geratherm Basal Mercury Free Thermometer - 1 ea
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Some people argue that to get the most precise reading, you’ll need a glass basal thermometer. These measure temperatures with high accuracy and you won’t have to worry about dying batteries. You’ll have to be careful not to drop them, though, as they tend to break easily.

While glass thermometers are great in many ways, you want one that is mercury-free. This basal thermometer from Geratherm is FDA-approved and environmentally-friendly.

Geratherm specially made this basal thermometer for women who are trying to conceive. The calibration strip has a large display for the temperature and even features a magnifying glass.

You can use this thermometer wherever you like, be it orally or rectally. However, just make sure you stick to one method! Nevertheless, the tip is easy to clean and disinfect after use.

Alongside the glass thermometer, Geratherm also provides you with a temperature chart. Here you can easily write down and keep track of your cycles.

Still, in saying all this, glass thermometers do have their drawbacks. First of all, they break easily if you drop them. Secondly, there’s no technology involved whatsoever, meaning that you’ll have to write down your reading immediately.

But if that doesn’t bother you, it’s a great thermometer to keep on your bedside table.

Pros

  • High precision.
  • Easy to read calibration strip.
  • Basal body temperature chart included.
  • Mercury-free and FDA-approved.

How to Track Ovulation Using a Basal Thermometer

To successfully track your cycle, the best thing to do is print out an ovulation chart or download an app. Some basal thermometers come with a compatible app that will help you out.

Then here’s what you do (source):

  • Pick a time: The first thing you’ll need to do is choose a time to measure your temperature. It must be in the morning when you first wake up as well as at the same time every day.
  • Note your period: The best time to start is when your period begins. Note this as day 1 and record your temperature.
  • Continue through your cycle: Keep going and note when your period starts and stops. Every day, at the same time, take your temperature.
  • Note your ovulation: After a couple of months, you’ll likely see a pattern. As we established above, before ovulation your BBT is lower — generally between 97.0 and 97.7 degrees Fahrenheit. When you increase to a range of 97.7 to 98.3 Fahrenheit and stay there for at least three days, you’ve ovulated and are in the luteal phase. This pattern is called “biphasic” since it consists of two phases.
  • Wait for your period: Roughly 14 – 16 days after the day of ovulation, your temperature will drop and you’ll get your period. If your temperature doesn’t go down for at least 18 days after ovulation, you’re likely pregnant.

It’s only fair to mention that this method does require some time and patience on your part. But in saying this, it’s cheap, easy, and will give you a good sense of your cycle. It’s also a great idea to bring your notes to your doctor’s appointment since it can help to pinpoint any fertility problems.


Hot or Not?

Tracking your basal body temperature is one of the easiest ways of learning about your cycle. It’s essential to take your temperature first thing in the morning, without much movement beforehand. It should also be around the same time every day to get the best results.

There are plenty of basal thermometers out there, but here you’ve seen our top five. Our favorite has to be the iProven Digital Basal Thermometer: it’s small, simple, and gets the job done.

Did you find a basal thermometer for you? Or do you have any advice for other TTC readers? Please leave your comment below, and make sure you share our list.

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