Converting Temperature Scales

The chart below will help you quickly make rough conversions between the Fahrenheit and Celsius temperature scales. To make more exact conversions, use the Temperature Conversion Application written in javascript based on the temperature conversion formulas outlined below.

To convert a temperature from one scale to the other, ENTER a temperature value in the "Temperature" field, then select the scale (Celsius or Fahrenheit), then press the "Calculate" button.

The results will be displayed in the "Result" field with an indication of the scale being displayed.

source code

Temperature Conversion Application

Temperature:
Scale:
Celsius:
Fahrenheit:
Result:

Temperature Conversion Formulas

In the formulas below, / means to divide, * means to multiply, - means subtract, + means to add and = is equal. Tc = temperature in degrees Celsius, Tf = temperature in degrees Fahrenheit

To convert a Fahrenheit temperature into Celsius:

    Tc = (5/9)*(Tf-32)

For example, to convert a Fahrenheit temperature of 98.6 degrees into degrees Celsius first subtract 32 from the Fahrenheit temperature to get 66.6. Then you multiply 66.6 by five-ninths to get 37 degrees Celsius.

To convert a Celsius temperature into degrees Fahrenheit:

    Tf = ((9/5)*Tc)+32

For example, to convert a Celsius temperature of 100 degrees into degrees Fahrenheit, first multiply the Celsius temperature reading by nine-fifths to get 180. Then add 32 to 180 and get 212 degrees Fahrenheit.

For more information see USA TODAY Weather page on converting between temperature scales.