BBT Celsius Thermometer (Digital)


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BBT Charting is the cheapest and easiest way to determine when you ovulate.

Our highly sensitive Celsius BBT thermometer is ideal for tracking your ovulation and fertility signs.

Use Our BBT Thermometer to chart your temperatures and track all your ovulation data and signs on a BBT Chart

Click here to download your free charting E-Book

Charting your temperatures with our thermometer you will be able to:

  • Pinpoint ovulation exactly with the use of ovulation predictor kits.
  • Get to know your body intimately.
  • Track your intercourse data.
  • Keep track of other ovulation signs.
  • Recognize luteal phase defects.
  • Recognize an anovulatory cycle.
  • Time your intercourse optimally.
  • Know when to do a pregnancy test.

BBT Charting:

The best way to chart your basal body temperature is to use a *BBT Thermometer. A fever thermometer will not do as it will simply give you ‘flat’ temperatures and you might miss the slight change in temperature that will determine ovulation.

You can visit, they have an amazing web site full of useful information about fertility signs, and you can chart your temperature daily for free, or you can use the chart that has been included in your purchase.


BBT thermometer vs. Fever thermometer:

All BBT thermometers should have an accuracy range of 0.1 °C. Fever thermometers have an accuracy range of between 1.0 °C and 0.2°C, which is not accurate enough for ovulation tracking. Our BBT thermometers are perfect for the job! To qualify being called a BBT thermometer a thermometer has to have a very high range of accuracy. It's not specifically branded as BBT or Basal Thermometer, the only important thing is the accuracy.

Meaning of Basal Body Temperature:

It is the normal body temperature checked upon wakening in the morning. In other words, it is the temperature taken under conditions unaffected by factors such as physical exercise, eating, drinking or mental uneasiness.

How to check Basal Body Temperature:

  1. When you go to bed at night, please prepare your thermometer and Basal Body Temperature Chart near your pillow.
  2. On awakening in the morning, please check your temperature by inserting the thermometer under your tongue and closing your mouth until your thermometer beeps.
  3. It is essential to check your temperature regularly every morning at a fixed time, between 06h00 a.m. and 08h00 a.m. If you check earlier than the fixed time, you may have lower readings, and if you check your temperature later than the fixed time, you may notice higher readings.

If possible, please try to take your temperature at a fixed time every morning.

Ovulation Day:

Ovulation day corresponds to the day of transition from the low temperature period to the high temperature period. You may feel, for a few days before ovulation, that discharge is increasing or there is dampness at the outer private parts or slight pain in the abdominal region. Please write such symptoms on the chart whenever they occur.

How to apply Basal Body Temperature Graph:

  1. For women who desire conception:

-       Generally speaking, the capacity of the spermatozoon to fertilize an egg lasts for about three days, while an egg is alive for 24 hours after ovulation. Therefore, during the five-day period including the first three days before and one day after ovulation, the possibility of pregnancy is the greatest.

  1. For women who do not desire conception:

-       Please check your daily temperatures for at least one month in order to correctly determine your basal body temperature condition and your high and low temperature periods. Even if it occurs soon after menstruation, during the three days transitional period from low to high temperature period, please be sure to use a contraceptive drug or device.

After each use, wipe your thermometer off using cotton containing a disinfectant such as alcohol.

Technical stuff:

  • Water Proof
  • Display Range: 32.0oC 43.00oC
  • Accuracy 0.1o
  • Min Scale of 0.01o
  • Memory: Last measurement reading
  • Measurement time of 60+/- 10 seconds in mouth, 100+-20 underarm (for reference only, it differs from person to person)
  • Beeper Function
  • Auto Shut-off
  • Battery: 1.5V button battery - Included


  1. 5/5

    love it…. everyone should get one of these

  2. 5/5

    Its a perfect choice for women to use this

  3. 5/5

    Works like an absolute charm!!!

  4. 5/5

    Easy ordering, quick delivery, looks exactly like the photo, and works perfectly. The padded packaging gave me peace of mind that the product was safely transported. The BBT Charting Advice Page and the two Blank Chart Sheets were a welcome bonus.

  5. 5/5

    This thermometer is everything it says it is and the company has excellent customer service! I will recommend them to anyone who asks.

  6. 5/5

    Excellent service and speedy delivery!
    I bought this about 4 years ago and the battery still works perfectly. I won’t ever buy another brand other than this one. It works great, reliable and accurate. I highly recommend it!

  7. 5/5

    Works well. Came quickly. Great service, perfect thermometer.

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