Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin
Common Reference Points
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Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 (or 1.8) and add 32. For example, 25°C = (25 × 1.8) + 32 = 77°F. A quick estimate: double the Celsius value and add 30.
What is absolute zero?
Absolute zero is 0 Kelvin, which equals -273.15°C or -459.67°F. It is the theoretical lowest possible temperature where all molecular motion ceases.
When should I use Kelvin vs Celsius?
Kelvin is used in scientific contexts where absolute temperature matters (thermodynamics, gas laws, physics). Celsius is standard for everyday weather, cooking, and medical temperatures in most countries outside the United States.