Are Forehead Thermometers Effective? | UPMC HealthBeat (2025)

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A thermometer is a tool used to measure body temperature. With technological advancements, forehead thermometers (also known as temporal artery thermometers) have become increasingly popular because they are easy to use and noninvasive.

However, a common question remains: Are forehead thermometers practical?

What Is a Forehead Thermometer?

A forehead thermometer uses infrared technology to measure the temperature of the temporal artery located just under the skin on the forehead. This thermometer quickly reads without needing physical contact inside the mouth, ear, or rectum.

Forehead thermometers are used in home settings, medical offices, and public spaces because they offer a noninvasive and hygienic option for temperature monitoring.

How Accurate Are Forehead Thermometers?

Accuracy is essential when choosing a thermometer, especially for those monitoring fevers in children or vulnerable individuals. Forehead thermometers are reliable when they are used properly.

Accuracy varies based on:

• Environmental factors — Room temperature, humidity, and excessive sweating may skew the results. Keep the forehead clean and dry for the most accurate thermometer reading.
• Model quality — The brand reputation and calibration significantly determine the reading accuracy. High-end models are more accurate than budget options — select a well-reviewed thermometer for reliability.
• Proper use — For optimal accuracy, place the forehead thermometer at the correct distance from the forehead, typically about 1–2 cm. If the device is too far away or incorrectly positioned, the reading can be inaccurate.

Comparing Forehead Thermometers to Other Types

There are various types of thermometers for measuring body temperature, including oral, tympanic (ear), rectal, and forehead thermometers.

• Oral thermometers — These thermometers measure temperature through the mouth. The thermometer is placed under the tongue, and the person must close their mouth for three minutes (or until the thermometer beeps) while the temperature is measured.
• Ear thermometers. These thermometers are placed gently into the ear and use infrared technology to measure the temperature of the ear canal. The infrared sensor detects the heat emitted by the eardrum and surrounding tissue to determine body temperature.
• Rectal thermometers. These thermometers are used for infants, small children, or those unable to use oral thermometers. They are inserted a small distance into the rectum (anal cavity).
• Forehead thermometers. These noninvasive thermometers measure the skin’s temperature over the temporal artery on the forehead. A sensor on the thermometer scans the temporal artery, and an infrared beam is used to measure the skin temperature.

Each type of thermometer has its pros and cons. The best choice depends on the age of the person being measured and the situation, including medical conditions, convenience, and speed.

So, how do forehead thermometers compare to these other options?

Forehead vs. oral thermometers

Oral thermometers require placement in the mouth for several minutes. They tend to be accurate but uncomfortable, especially for children. Forehead thermometers, on the other hand, provide quicker readings (just a few seconds) and are noninvasive.

However, oral thermometers are more precise when exact measurements are necessary.

Forehead vs. ear (tympanic) thermometers

Ear thermometers use infrared technology to measure the temperature inside the ear canal. They are often more accurate than forehead thermometers, especially in children over 6 months old.

However, ear thermometers are not always the best option for infants and young children because they require correct placement in the ear canal. Accuracy also may be skewed if the child has an ear infection or excess earwax.

Forehead thermometers are generally more convenient for quick readings than ear thermometers, especially when working with fussy children or those who dislike having a thermometer placed in their mouth or ear. They are also more hygienic since they don’t require direct contact with bodily fluids.

Forehead vs. rectal thermometers

Rectal thermometers are the gold standard for accuracy, particularly in infants younger than 3 months. Rectal thermometers are also the most invasive and uncomfortable option. Parents and caregivers often prefer forehead thermometers to rectal thermometers for their convenience and comfort despite their slightly lower accuracy.

Benefits of Using a Forehead Thermometer

Forehead thermometers offer several benefits that make them popular for at-home use:

• Hygienic — Since they don’t require direct skin contact (in most models), forehead thermometers are easier to clean and use without disposable covers.
• Noninvasive and easy to use — There is no need for contact with the skin or body openings, making them more comfortable, especially for children and infants.
• Quick readings — Forehead thermometers provide results in seconds, which is ideal for quickly assessing a fever in a child or adult.
• Safe for all ages — Used on infants, children, and adults, forehead thermometers provide a versatile option for family care.
• There’s no need for repositioning — Unlike ear thermometers, which require the thermometer to be placed correctly in the ear canal, forehead thermometers are used with a simple sweep across the forehead.

Forehead Thermometer Accuracy: Reliability and Limitations

While forehead thermometers are generally reliable, they have limitations. Accuracy issues arise when misused, such as positioning the thermometer incorrectly on the forehead or failing to account for external temperature influences. Calibration also impacts accuracy: Some lower-end models may not provide as precise readings as more expensive options.

Check the manufacturer’s guidelines for proper usage to guarantee the most accurate thermometer results. When a fever is suspected and readings are inconsistent, verify the temperature with another type of thermometer, like an ear or rectal thermometer.

Can Forehead Thermometers Be Used On Infants?

Forehead thermometers are safe and effective for infants. Unlike rectal thermometers, which are difficult or uncomfortable for babies, forehead thermometers provide a fast and noninvasive way to check an infant’s temperature.

Calibrate the device correctly and account for environmental factors, such as sweating or room temperature.

Best thermometer for kids: What to look for

When selecting the best thermometer for kids, look for:

• Accuracy — Look for thermometers that provide consistent and reliable readings. Check for product reviews to gauge accuracy.
• Comfort — Choose noninvasive models that won’t make your child feel uneasy.
• Ease of use — A thermometer must be simple to operate, especially when trying to take a reading quickly on a child.
• Multifunctionality — Some thermometers measure body temperature and the temperature of objects or liquids, making them more versatile.
• Speed — A thermometer that delivers a quick reading is more comfortable for a child and minimizes distress for both the adult and the child.

When choosing a forehead thermometer, select a high-quality model, follow the manufacturer’s instructions carefully, and use it in appropriate conditions to confirm results.