Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.

Fever Temperatures: Accuracy and Comparison

Overview

You can take a temperature using the mouth (oral), anus (rectal), armpit (axillary), ear (tympanic), or forehead (temporal). But the temperature readings vary depending on which one you use. And you need an accurate measurement to know if a fever is present.

Medical research hasn't found an exact correlation between oral, rectal, ear, armpit, and forehead temperature measurements. In general, here's how the temperatures compare:

  • The average normal oral temperature is 98.6 °F (37 °C).
  • A rectal temperature is 0.5° F (0.3° C) to 1° F (0.6° C) higher than an oral temperature. A rectal temperature is generally thought to be the most accurate for checking a baby's temperature.
  • An ear (tympanic) temperature is 0.5° F (0.3° C) to 1° F (0.6° C) higher than an oral temperature.
  • 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.

Credits

Current as of: August 6, 2023

Author: Healthwise Staff
Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.