About this Temperature converter
Convert Celsius, Fahrenheit, and Kelvin instantly. Enter a temperature value, choose your source and target scale, and get an accurate result for weather, cooking, scientific work, and international travel.
How to use this temperature converter
Enter the number you want to convert.
Choose the source unit and target unit from the dropdowns.
Review the live result or open a preset example to jump into a common conversion.
When to use this converter
You are reading a weather forecast from a country that uses a different temperature scale and want to understand the actual conditions before travelling.
A recipe gives an oven temperature in Fahrenheit but your oven dial is marked in Celsius, or the other way around.
You are studying chemistry or physics and need to convert between Celsius and Kelvin for thermodynamic calculations.
A product manual, storage guideline, or shipping restriction specifies a temperature range in a scale different from what your thermometer displays.
Common problems and fixes
The Fahrenheit result looks unexpectedly high or low.
Fahrenheit and Celsius do not share the same zero point, so the conversion is not a simple multiplication. The formula is °F = (°C × 9/5) + 32. A typical room temperature of 20 °C equals 68 °F, not 36 °F.
The Kelvin result is negative.
Kelvin cannot be negative — it starts at absolute zero (0 K = −273.15 °C). If you see a negative Kelvin result, the input Celsius or Fahrenheit value is below absolute zero, which is not physically possible under normal conditions. Check that the source value and unit are correct.
I need to convert Rankine but it is not available.
Rankine is not included in this converter. As a reference, Rankine equals Kelvin × 9/5. Convert to Kelvin first using this tool, then apply that multiplication.
Available units
Celsius
C
Fahrenheit
F
Kelvin
K
Related unit converter pages
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Select Celsius as the source and Fahrenheit as the target, enter your temperature, and the converter calculates the result. The formula is (°C × 9/5) + 32.
What is 100 degrees Celsius in Fahrenheit?
100 °C equals 212 °F — the boiling point of water at sea level.
What is 0 degrees Celsius in Fahrenheit?
0 °C equals 32 °F — the freezing point of water.
How do I convert Celsius to Kelvin?
Add 273.15 to the Celsius value. 0 °C equals 273.15 K, and 100 °C equals 373.15 K.
Is this temperature converter free to use?
Yes. It is free to use and works directly in your browser.
What temperature scales does this converter support?
Celsius, Fahrenheit, and Kelvin.