Convert temperatures between Celsius, Fahrenheit, and Kelvin instantly.
Celsius to Fahrenheit: °F = (°C × 9/5) + 32 | Fahrenheit to Celsius: °C = (°F − 32) × 5/9 Celsius to Kelvin: K = °C + 273.15 | Kelvin to Celsius: °C = K − 273.15
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Frequently Asked Questions
A temperature converter is a free online tool that instantly converts between Celsius, Fahrenheit, and Kelvin temperature scales.
Type a temperature in any field (Celsius, Fahrenheit, or Kelvin). The other two fields update automatically with the converted values.
Yes, this tool is completely free to use with no signup required.
Type a temperature into the Celsius, Fahrenheit, or Kelvin field — the other two scales update instantly.
Use decimals for precision (e.g. 36.6 °C for body temperature) — the converter accepts any numeric value, positive or negative.
Copy the converted value directly, or clear the field to start a new conversion. No button click required.
Common Use Cases
Cooking & baking: Convert oven temperatures from American recipes (°F) to European recipes (°C) when following international cookbooks.
Weather & travel: Quickly translate a foreign weather forecast — most of the world reports in Celsius while the US still uses Fahrenheit.
Science & engineering: Convert lab readings or HVAC specs between scales, including Kelvin for thermodynamics calculations.
Frequently Asked Questions
What is the formula for Celsius to Fahrenheit?
°F = (°C × 9/5) + 32. For example, 100 °C = (100 × 1.8) + 32 = 212 °F (water's boiling point at sea level).
At what temperature are Celsius and Fahrenheit equal?
At −40°. That is the single point where both scales read the same number: −40 °C = −40 °F.
Does this tool work offline?
Yes. The conversion runs entirely in your browser with JavaScript — no values are sent to a server, so once the page loads you can use it without an internet connection.