Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin
| Reference | °C | °F | K |
|---|---|---|---|
| Absolute zero | -273.15 | -459.7 | 0.00 |
| Water freezes | 0 | 32.0 | 273.15 |
| Room temp | 20 | 68.0 | 293.15 |
| Body temp | 37 | 98.6 | 310.15 |
| Water boils | 100 | 212.0 | 373.15 |
How to use
Enter a temperature value and select the source unit. The converter instantly shows the equivalent in Celsius, Fahrenheit, and Kelvin, along with common reference points for context.
Formula
Examples
Body temperature
Normal body temperature is 37°C, which equals 98.6°F or 310.15 K. A fever is typically above 38°C (100.4°F).
Cooking temperatures
An oven at 350°F equals about 177°C. Most baking recipes from the US use Fahrenheit, while European recipes use Celsius.
Weather comparison
A comfortable room temperature of 20°C equals 68°F. When traveling, knowing the conversion helps interpret local weather forecasts.
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 (or 1.8), then add 32. For example, 25°C = 25 x 1.8 + 32 = 77°F.
What is absolute zero?
Absolute zero is 0 Kelvin, -273.15°C, or -459.67°F. It is the lowest possible temperature where all molecular motion stops.
At what temperature are Celsius and Fahrenheit equal?
Celsius and Fahrenheit are equal at -40 degrees. Setting C = F in the conversion formula gives -40°C = -40°F.
Why does the US use Fahrenheit?
The Fahrenheit scale was adopted in the US before the metric system gained worldwide popularity. Most other countries switched to Celsius as part of metrication in the 20th century.
What is Kelvin used for?
Kelvin is the SI unit of temperature used in science and engineering. It starts at absolute zero, making it useful for thermodynamics, physics, and chemistry where negative temperatures are not meaningful.
About this tool
Convert between Celsius, Fahrenheit, and Kelvin instantly. See the formula and conversion table. Free online temperature converter.
All calculations are performed locally in your browser. Your data never leaves your device.