Convert Celsius, Fahrenheit, Kelvin. Free temperature converter.
Temperature conversion between Celsius, Fahrenheit, and Kelvin is needed more often than most people realize. International recipes list oven temperatures in Celsius while American ovens display Fahrenheit. Weather reports differ by country. Scientific literature exclusively uses Celsius or Kelvin. This converter instantly translates between all three scales, showing the exact converted value as you type. Understanding the relationship between these temperature scales helps you interpret weather forecasts while traveling, follow international recipes accurately, and understand scientific temperature references.
Select the source scale and target scale, enter a temperature, and see the result immediately. The converter first translates to Celsius as a common base: Fahrenheit to Celsius uses the formula (F - 32) multiplied by 5/9; Kelvin to Celsius subtracts 273.15. Then it converts from Celsius to the target scale: Celsius to Fahrenheit multiplies by 9/5 and adds 32; Celsius to Kelvin adds 273.15.
Travelers convert weather forecasts between Celsius and Fahrenheit. Home cooks translate oven temperatures from international recipes. Scientists convert between Celsius and Kelvin for laboratory work. HVAC technicians work across both temperature systems depending on equipment origin. Teachers explain temperature scales and their historical development.
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Subtract 32 from the Fahrenheit temperature, then multiply the result by 5/9. For example, 72 degrees Fahrenheit minus 32 equals 40, multiplied by 5/9 equals 22.2 degrees Celsius. For a quick estimate, subtract 30 and divide by 2.
Minus 40 degrees is the same in both scales. At -40, the Celsius and Fahrenheit scales intersect. This is the only temperature where both readings are identical, a fact that arises naturally from the mathematical relationship between the two conversion formulas.
Absolute zero is 0 Kelvin, equivalent to -273.15 degrees Celsius or -459.67 degrees Fahrenheit. It represents the theoretical lowest possible temperature where all molecular motion would cease. No object has ever been cooled to exactly absolute zero, though laboratory experiments have come within billionths of a degree.
The Fahrenheit scale was developed by Daniel Gabriel Fahrenheit in 1724 and was the standard in most English-speaking countries. While most nations switched to Celsius during metrication in the 20th century, the United States retained Fahrenheit for everyday use due to familiarity and the cost of changing embedded systems like weather reporting and thermostats.
180 degrees Celsius equals 356 degrees Fahrenheit. This is a very common baking temperature used in European and Australian recipes, roughly equivalent to the 350 degree Fahrenheit setting found on most American ovens.