Free Temperature Converter Online
Convert between Celsius (°C), Fahrenheit (°F) and Kelvin (K) with live conversion as you type. All three values update simultaneously.
Common Reference Points
About the Temperature Converter
This free online temperature converter lets you convert between Celsius (°C), Fahrenheit (°F) and Kelvin (K) simultaneously. Simply type a value in any of the three fields and the other two update instantly — no button press required. Your last Celsius value is saved locally so it's ready on your next visit.
Whether you're converting a recipe temperature, checking weather forecasts from a different country, or studying thermodynamics, this tool gives you fast and accurate results every time.
How to Use the Temperature Converter
Type in Any Field
Enter a temperature value in Celsius, Fahrenheit or Kelvin — whichever you know.
See All Three Instantly
The other two fields update automatically as you type, with no button needed.
Use Reference Points
Refer to the common reference card below the inputs for quick sanity checks.
Temperature Conversion Formulas
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
Frequently Asked Questions
100°C is equal to 212°F — the boiling point of water at standard atmospheric pressure.
Absolute zero is the lowest possible temperature — -273.15°C, -459.67°F or 0 Kelvin — where all thermal motion of particles theoretically ceases.
Multiply the Celsius value by 9/5 (or 1.8), then add 32. For example: 37°C × 9/5 + 32 = 98.6°F.
Both are correct — 37°C and 98.6°F are exactly equivalent values representing the average healthy adult body temperature.