Temperature Scale Converter

This online calculator allows users to convert temperature values between the seven most widely used temperature scales. These scales are Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Réaumur, and Rømer.

The conversion between these scales can be complex, and the Temperature Scale Converter can help users to quickly and accurately convert between them.

Usage: you enter the numerical value for the temperature and the calculator builds the 7x7 matrix, where you can lookup how the entered temperature for a particular scale converts to the temperature value in another scale by looking at the row and the column intersection.

For example, you enter 0, because you want know how much is the zero at the Celsius scale would be in the Kelvin scale. To find out, you need to locate the "Celsius" row and look for the intersection with the "Kelvin" column. The answer will be 273.15, of course.

Brief description of each of the supported temperature scales can be found below the calculator.

Temperature scales

Digits after the decimal point: 2
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Temparature Scales

Celsius scale (Celsius, °C)
The Celsius scale is the most commonly used scale worldwide, and it is based on the freezing and boiling points of water. 0° - the freezing point of water, 100° - the boiling point of water at normal atmospheric pressure. It was invented by Anders Celsius in 1742.

Fahrenheit scale (Fahrenheit, °F)
The Fahrenheit scale is used mainly in the United States, and it is also based on the freezing and boiling points of water. It is a temperature scale, where 1 degree (1° F) temperature difference is equal to 1/180 of the distance from the water boiling point to the melting point of ice at normal atmospheric pressure, and the melting point of ice has a temperature of +32°F. It was invented by Gabriel Fahrenheit in 1724.

Celsius conversion formula
$C=\frac{5}{9}(F-32)$

Kelvin scale(Kelvin, K)
Kelvin is a scale used in scientific applications, and it is based on the absolute zero temperature. It was born from the desire to get the scale of absolute zero (absence of thermodynamic energy). It was named in honor of William Thomson, Lord Kelvin.
He identified the absolute zero theoretically, and it was -273°C. One degree Celsius was accepted for one degree of Kelvin, making the conversion between these two scales trivial. This happened in 1848.

In 1954, on the tenth major conference of Weights and Measures (Conférence Générale des Poids et Mesures, CGPM), it was decided that the fixed point of the Kelvin scale is the triple point of water, and its temperature is 273.16K.

By the way, K is written without a degrees icon since 1968, after the 13th major conference, and degrees after the conference was 1/273.16 temperature of the triple point of water (well, as it is still the same one degree Celsius, but now more scientifically).

Rankine scale (Rankine, °Ra)
Rankine is another absolute temperature scale, mainly used in the United States. It is the absolute temperature scale for the Fahrenheit, like the K for the °C. It was proposed in 1859 by William Rankine. Zero degrees Rankine is -459.67°F and 0K (zero degrees Kelvin).

Delisle scale (Delisle, °De)
Delisle is a temperature scale that was invented in Russia, and it is based on the boiling point and melting point of mercury. It was invented in 1732 by Joseph-Nicolas Delisle. Zero - the boiling point of water and one degree is minus two-thirds of a degree Celsius (because the freezing point of water at that scale 150°De). The count of positive values goes in the opposite direction to that of °C

Celsius conversion formula
$C=100 - De\frac{2}{3}$

Réaumur scale (Réaumur, °Ré, °Re)
It was created by René Antoine Ferchault de Réaumur in 1730. Actually, the freezing point of water - 0°Re, the boiling point of water 80°Re.

Celsius conversion formula
$C=Re\frac{5}{4}$

Rømer scale (Rømer, °Rø)
It was invented in 1703 in Denmark by Ole Rømer. Initially the zero degree on this scale was the freezing point of the brine. Then it was recalibrated - the freezing point of water is 7.5°Rø and the boiling point of water is 60°Rø.

Celsius conversion formula
$C=(Re-7.5)\frac{40}{21}$

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