Temperature Converter — Free Online Tool
Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine online for free. Enter any value and see all conversions instantly.
About Temperature Converter
Temperature conversion is needed daily for weather forecasting, cooking recipes, scientific work, industrial processes, and international travel. Our temperature converter handles all major scales: Celsius (used in most countries), Fahrenheit (used in the USA), Kelvin (absolute scale used in science), and Rankine (absolute Fahrenheit scale used in some engineering contexts). Enter a value in any scale and all other equivalents update instantly.
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
F = (C x 9/5) + 32. For example, 100C = 212F (boiling point of water).
How do I convert Fahrenheit to Celsius?
C = (F - 32) x 5/9. For example, 98.6F = 37C (normal body temperature).
What is absolute zero?
Absolute zero is -273.15C, -459.67F, and 0 Kelvin — the coldest theoretically possible temperature.
When was Fahrenheit phased out?
Most countries have adopted Celsius. The USA and a few others still use Fahrenheit.
What is Kelvin used for?
Kelvin is used in science and physics where an absolute temperature scale with no negative values is needed.