Free Online Temperature Converter and Calculator

How to use the temperature conversion tool

Enter a value to convert from in any of the empty field, then click the "Convert" button. Click "reset" to start a new temperature conversion. More temperature conversion units will be added later.


Temperature conversion chart and
temperature conversion table

Fahrenheit Information

Fahrenheit is a temperature scale named after
the German physicist Gabriel Fahrenheit (16861736).
In this scale, the freezing point of water is 32 degrees (this is written "32 F"), and the boiling point is 212 degrees Fahrenheit, placing the boiling and melting points of water 180 degrees apart.

Fahrenheit conversion chart
Kelvin [K] = ([F] + 459.67) 5/9 [F] = [K] 9/5 − 459.67
Celsius [C] = ([F] − 32) 5/9 [F] = [C] 9/5 + 32
Rankine [Ra] = [F] + 459.67 [F] = [Ra] − 459.67
More info on Fahrenheit

Celsius Information

The degree Celsius (C) is a unit of temperature named after the Swedish astronomer Anders Celsius (17011744)
The Celsius temperature scale was originally designed so that the boiling point of water is 0 degrees, and its freezing point is 100 degrees at standard atmospheric pressure.
This was reversed to its modern order some time after his death.
So water boils at 100 degrees and freezes at 0 on the Celsius scale now.

Celsius conversion chart

Kelvin [K] = [C] + 273.15 [C] = [K] − 273.15
Fahrenheit [F] = [C] 9/5 + 32 [C] = ([F] − 32) 5/9
Rankine [Ra] = [C] 9/5 + 491.67 [C] = ([Ra] − 491.67) 5/9
more info on Celsius

Kelvin Information

The kelvin is named after the British physicist and engineer William Thomson, 1st Baron Kelvin.
The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. It is defined by two facts: zero kelvins is absolute zero (when molecular motion stops), and one kelvin is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. The Celsius temperature scale is now defined in terms of the kelvin, with 0 C corresponding to 273.15 kelvins, approximately the melting point of water under ordinary conditions.

Kelvin conversion chart

Celsius [C] = [K] − 273.15 [K] = [C] + 273.15
Fahrenheit [F] = [K] 9/5 − 459.67 [K] = ([F] + 459.67) 5/9
Rankine [Ra] = [K] 9/5 [K] = [Ra] 5/9
More info on Kelvin

Rankine Information

Rankine is a now rarely used temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859.
The symbol is R (note that this symbol is also used to stand for the Rmer and Raumur scales). Like kelvin, Rankine zero is absolute zero, but Fahrenheit degrees are used. As a result, a difference of 1R is equal to a difference of 1F, but 0R is −459.67F.

Rankine temperature conversion chart

Kelvin [K] = [R] 5/9 [R] = [K] 9/5
Celsius [C] = [R] 5/9 − 273.15 [R] = ([C] + 273.15) 9/5
Fahrenheit [F] = [R] − 459.67 [R] = [F] + 459.67
More info on Rankine


Temperature Converter Tool: Info and Disclaimer:

The temperature conversion tool and charts are not meant for commercial purposes. I've tried to verify all of the numbers, but I can't guarantee that they are 100% correct so I would have appreciated that you contacted me (in the highly unlikely event :) if you should find any errors.