Temperature Converter
Convert temperatures between Celsius, Fahrenheit, Kelvin and historical temperature scales.
Enter the values required below.
🌡️ Temperature Comparison
Enter a temperature and see how it compares with some seriously hot and cold places!
Frequently Asked Questions
How do I use this temperature converter?
Enter the temperature, select the original temperature scale in the From field, select the scale you want in the To field, and click Convert. This temperature conversion calculator supports Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Delisle, Rømer and Newton.
Why are Celsius and Fahrenheit different?
Celsius and Fahrenheit use different reference points and different sized intervals. Water freezes at 0°C and 32°F, while it boils at 100°C and 212°F under standard atmospheric pressure. A Celsius to Fahrenheit converter makes the relationship between the two scales easy to calculate.
What is Kelvin and why is it used?
Kelvin is an absolute temperature scale used extensively in science and engineering. Its zero point is absolute zero. The Kelvin scale uses the same size degree interval as Celsius, so temperature conversion between Celsius and Kelvin is particularly straightforward.
What is the Rankine temperature scale?
Rankine is an absolute temperature scale that uses Fahrenheit-sized degree intervals. It is mainly encountered in engineering and thermodynamics, making a Rankine temperature converter useful when working with absolute temperatures expressed using Fahrenheit-sized degrees.
What is the Réaumur temperature scale?
The Réaumur scale places the freezing point of water at 0°Ré and the boiling point at 80°Ré under standard conditions. It was historically used in parts of Europe and is now mainly of historical interest. This converter allows Réaumur temperature conversion alongside modern temperature scales.
Why is the Delisle scale inverted?
The Delisle scale runs in the opposite direction from Celsius and Fahrenheit. Its original scale placed the boiling point of water at 0°D and the freezing point at 150°D. As temperature increased, the numerical Delisle value therefore decreased.
What is the Rømer temperature scale?
The Rømer scale was developed by Danish astronomer Ole Rømer. Its historical reference points included the freezing of brine and the boiling point of water. The scale is rarely used today, but it is included here for historical temperature conversion.
What is the Newton temperature scale?
The Newton scale was proposed by Isaac Newton as an early attempt to quantify temperature. Its scale placed the freezing point of water at 0°N and the boiling point at 33°N. It is now mainly of historical interest but can still be useful for understanding the development of temperature measurement.
Why are there so many temperature scales?
Different temperature scales were developed for different scientific, engineering and practical purposes. Celsius and Fahrenheit became common for everyday measurements, Kelvin became important in science, while scales such as Réaumur, Delisle, Rømer and Newton reflect earlier approaches to measuring temperature.
What is absolute zero?
Absolute zero is 0 Kelvin, equivalent to approximately -273.15°C and -459.67°F. It is the theoretical lowest possible temperature and is the starting point of absolute temperature scales such as Kelvin and Rankine.
Can I ask a question?
Yes. If you couldn't find the temperature conversion answer you're looking for, you can ask us a question below.
🌡️ Temperature Trivia
The coldest natural temperature recorded on Earth
Earth's lowest officially recorded natural air temperature is −89.2°C, measured at Vostok Station in Antarctica in 1983.
The hottest officially recorded air temperature
The officially recognized highest air temperature is 56.7°C, recorded at Furnace Creek in Death Valley, California, in 1913.
Water has an unusual freezing point
Pure water freezes at 0°C at standard atmospheric pressure, but dissolved salts lower the freezing point. That is why salt is used to help melt ice on roads.
The hottest temperatures in the universe are beyond imagination
Extreme high-energy events can produce temperatures reaching trillions of degrees, vastly hotter than anything naturally experienced on Earth's surface.
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