Conversion · Temperature
Temperature Converter
Convert a temperature between Celsius, Fahrenheit, and Kelvin.
Temperature Converter
Enter a value, choose the units, then select Convert.
How this conversion works
Unlike length or weight, temperature scales don't share a zero point, so conversions use fixed formulas rather than a simple multiplier: °F = °C × 9⁄5 + 32 and K = °C + 273.15. Every conversion here is computed through Celsius as a common reference point.
Examples
0°C = 32°F = 273.15 K (water freezes). 100°C = 212°F (water boils). −40°C = −40°F (the one point where both scales agree).
About these conversion formulas
These are the standard, internationally defined relationships between the Celsius, Fahrenheit, and Kelvin scales — fixed physical definitions, not estimates.
Related tools
More calculators are on the way — browse everything planned on the Home page.
Frequently asked questions
Does the result update automatically?
Yes — once you've entered a value, changing either unit recalculates the result immediately, without needing to select Convert again.
Why does the calculator say my input is invalid?
The value field is empty, not a number, or converts to a temperature below absolute zero (−273.15°C), which isn't physically possible.
Temperature Solution
Converted temperature
Result will appear here.
Calculation steps