Temperature Converter
Common Reference Temperatures
Free Online Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly with this free temperature converter. All three fields update bidirectionally in real time so you can type in any unit and see the equivalent values immediately. A visual temperature scale shows where your value falls between absolute zero and 300 degrees Celsius.
How to Use
Enter a temperature value in any of the three input fields (Celsius, Fahrenheit, or Kelvin). The other two fields update instantly with the converted values. You can also click on a common reference temperature to populate the fields. The gradient bar provides a visual indicator of where the temperature sits on the scale.
FAQ
What formulas are used for conversion?
Fahrenheit = Celsius x 9/5 + 32. Kelvin = Celsius + 273.15. These standard formulas are used for all conversions.
What is absolute zero?
Absolute zero is 0 Kelvin, -273.15 Celsius, or -459.67 Fahrenheit. It is the lowest possible temperature where all molecular motion ceases.
Can I enter negative values?
Yes. Negative Celsius and Fahrenheit values are valid. However, Kelvin cannot be negative in physical terms. The converter will still calculate the mathematical result.
How precise are the results?
Results are rounded to two decimal places, which is more than sufficient for everyday use and most scientific applications.