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Temperature Comparison

Compare temperatures in different units with the body temperature of humans and the average temperatures of space, Earth and Sun. Internationally, temperature is commonly measured in degrees Celsius or centigrade, whereas many English speaking countries prefer Fahrenheit. Scientifically, Kelvin is used, which also is the only unit to compare temperatures. This is, because the Kelvin scale, unlike the other scales, has a real zero.
Please enter one value, the other values will be calculated.

Degrees Celsius:
Fahrenheit:
Kelvin:
Human body temperature:
Freezing point of water:
Water with maximum density:
Boiling point of water:
Space:
Earth surface min.:
Earth surface ø:
Earth surface max.:
Sun surface:
Round to   0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15   decimal places

Example: the boiling point of water is 1.2 times higher as the average human body temperature.

Only the Kelvin scale is ratio-based and therefore allows multiplication and division. The common Celsius and Fahrenheit scales, on the other hand, do not permit such comparisons. So, if you hear statements like "something is twice as hot as something else", caution is advised. To correctly calculate a multiple of a temperature, it must first be converted to Kelvin, then multiplied, and finally converted back to the original unit. Anything else will lead to incorrect results.
Temperature specifications in Kelvin, degrees Celsius and Fahrenheit are unambiguous. The other specifications here are not, or only to a limited extent. The specifications for water depend on pressure. Here they refer to standard atmospheric pressure of 1013 millibars. Space is cooling, albeit extremely slowly by our standards. Temperatures on Earth are, of course, subject to change, as is the surface of the sun.

Temperature ratios are not often calculated. One reason for this might be the difficulty of the calculation, due to the first necessary conversion to Kelvin and the subsequent conversion back. A calculator obviously automates much of this process. Perhaps there are simply only few applications for such a calculation. Nevertheless, such a calculation is feasible if performed mathematically correctly.

Last updated on 01/10/2026. Author: Jürgen Kummer

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