Temperature Converter for the Classroom
Convert Celsius, Fahrenheit and Kelvin.
About this temperature converter
This converter changes temperatures between Celsius, Fahrenheit and Kelvin. Celsius to Fahrenheit multiplies by 9/5 and adds 32; Fahrenheit to Celsius subtracts 32 and multiplies by 5/9; Kelvin is Celsius plus 273.15.
Useful reference points: water freezes at 0 degrees Celsius (32 Fahrenheit, 273.15 Kelvin) and boils at 100 degrees Celsius (212 Fahrenheit, 373.15 Kelvin) at standard sea-level pressure.
Type a value, choose the scales and read the answer. The swap button reverses the direction.
How to use it
- Type a temperature.
- Choose the scale you are converting from and the scale you want.
- Read the result.
- Press Swap to reverse it.
- Copy the link to share the conversion.
Classroom tips
- Have students predict whether 25 degrees Celsius is warm or cold before they convert it.
- Use the freezing and boiling points of water as anchors for both scales.
- Ask why the Kelvin scale has no negative numbers.
- Compare the weather report from two countries by converting a week of temperatures.
Reviewed 2026-10-03. Conversion factors are exact definitions.
Frequently asked questions
What is the formula for Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5, then add 32. For example, 100 degrees Celsius is 100 x 9/5 + 32 = 212 degrees Fahrenheit.
What is absolute zero?
Absolute zero is 0 kelvins, which is minus 273.15 degrees Celsius or about minus 459.67 degrees Fahrenheit.
At what temperature are Celsius and Fahrenheit equal?
They are equal at minus 40.
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