Forehead temps are the next most accurate. Oral and ear temps are also accurate if done properly. Temps done in the armpit are the least accurate. Armpit temps are useful for screening at any age.

How many degrees do you add when you take a temperature under the arm?

An armpit (axillary) temperature is usually 0.5°F (0.3°C) to 1°F (0.6°C) lower than an oral temperature. A forehead (temporal) scanner is usually 0.5°F (0.3°C) to 1°F (0.6°C) lower than an oral temperature.

Can you use your armpit to take your temperature?

Using underarm temperature is a safe and effective way to monitor body temperature, especially in younger children. However, it isn't the most accurate method. So if you suspect a fever in a young child, it's best to confirm their body temperature using a rectal or ear thermometer.