What is the traditionally cited normal human body temperature, in Fahrenheit?

How to get close to this number

Everyone knows the Celsius figure, so this is a unit conversion: multiply by nine fifths and add thirty-two. Converting from the value you hold is more reliable than recalling the one you do not, and this pair is the most commonly converted in everyday life.

The history in the explanation is the interesting part: the number comes from a nineteenth-century German physician averaging thousands of armpit readings. A figure printed on every thermometer and taught in every school traces to one study with one measurement method, and it has never been seriously revised in popular use.

Modern research suggests the true average runs slightly cooler, closer to ninety-eight degrees. The reasons are debated — possibly better general health reducing chronic low-grade inflammation — but the practical point is that a canonical medical constant turns out to be a nineteenth-century average that quietly drifted.