About the Temperature Converter
Celsius, Fahrenheit and Kelvin do not share a zero point, so temperature cannot be converted with a single multiplier the way length or mass can. Each direction needs an offset as well as a scale factor, and this tool applies the correct pair for whichever combination you pick. Rankine is offered too, for thermodynamics work that wants an absolute scale measured in Fahrenheit sized degrees.
The formula for the selected direction is printed with the answer, so Celsius to Fahrenheit shows the familiar multiply by nine fifths then add thirty two. A useful check is minus forty, the single point where Celsius and Fahrenheit read the same number. Another is body temperature at 37 degrees Celsius, which comes out as 98.6 Fahrenheit.
Values below absolute zero are rejected rather than quietly converted, because minus 300 Celsius is not a temperature that exists. Absolute zero sits at minus 273.15 Celsius, minus 459.67 Fahrenheit, and zero on both Kelvin and Rankine. Paste a column of readings to convert them together, then use the table underneath to spot check the output against figures everybody already knows.
How to use
- Enter one temperature per line.
- Choose the scale you have and the scale you want.
- Read the formula printed under the results.
- Copy the converted temperatures.
Common questions
- What is 100 degrees Fahrenheit in Celsius?
- About 37.78 degrees Celsius, just above normal body temperature.
- Why is there no degree symbol on Kelvin?
- Kelvin is an absolute unit, so it is written as 300 K rather than 300 degrees K.
- At what point do Celsius and Fahrenheit meet?
- At minus 40. Both scales read minus 40 there, which makes it a quick way to check any converter.
- Why was my value rejected?
- It fell below absolute zero for the scale you selected, which is physically impossible, so an error is reported instead of a number.