Free Temperature Converter - Celsius, Fahrenheit & Kelvin
Convert between Fahrenheit, Celsius, and Kelvin with instant, accurate results.
Formula & Methodology
Temperature conversion uses fixed linear relationships between the Celsius, Fahrenheit, and Kelvin scales. Celsius and Fahrenheit differ in both their zero point and their degree size, while Kelvin shares the Celsius degree size but starts at absolute zero.
- °F = (°C × 9/5) + 32
- °C = (°F − 32) × 5/9
- K = °C + 273.15
Worked Example
Using the Temperature Converter: apply the formula above to your input values. For instance, °F = (°C × 9/5) + 32, then °C = (°F − 32) × 5/9. The tool performs each step instantly and shows the result.
Frequently Asked Questions
What is the difference between Celsius and Fahrenheit?
Celsius sets water’s freezing point at 0° and boiling at 100°, while Fahrenheit uses 32° and 212° for the same points.
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and add 32; to reverse, subtract 32 and multiply by 5/9.
What is Kelvin used for?
Kelvin is the scientific absolute scale starting at absolute zero; add 273.15 to a Celsius value to get Kelvin.