Convert temperature to/from Celcius, Fahrenheit, kelvin, and Rankin. Enter a number in the first text box, select unit to convert from, select unit to convert to, then press the 'Convert' button. The answer will appear in the last text box.

Temperature is a physical quantity measured with a thermometer and studied in thermometry. In everyday life, it is linked to the sensations of cold and hot, resulting from the thermal transfer between the human body and its environment. In physics, it is defined in several ways: as an increasing function of the degree of thermal agitation of particles (in kinetic theory of gases), by the equilibrium of heat transfers between several systems or from entropy (in thermodynamics and in statistical physics). Temperature is an important variable in other disciplines: meteorology and climatology, medicine, and chemistry.

Fahrenheit is a thermodynamic temperature scale, where the freezing point of water is 32 degrees Fahrenheit (° F) and the boiling point is 212 ° F (under normal atmospheric pressure). This separates the boiling and freezing points of water exactly 180 degrees. Therefore, one degree on the Fahrenheit scale is 1/180 of the interval between the freezing point and the boiling point of water. Absolute zero is defined as -459.67 ° F.

The degree Celsius (symbol ° C) is the unit of the Celsius temperature scale, which is a unit derived from the International System of Units, introduced on December 25, 1948. Its name is a reference to the Swedish astronomer and physicist Anders Celsius, inventor in 1742 of one of the first centigrade temperature scales. This unit of measurement is in common use around the world, with the exception of the United States, Belize, and the Cayman Islands, which still use the Fahrenheit scale.

L’échelle de température la plus courante est le degré Celsius, dans laquelle la glace (formée d'eau) fond à 0 °C et l'eau bout à environ 100 °C dans les conditions standard de pression.

The kelvin (symbol K, named after William Thomson said Lord kelvin), is the SI base unit of thermodynamic temperature. By convention, unit names are common names and are written in lowercase ("kelvin" not "kelvin").

Until May 20, 2019, the kelvin was defined as the fraction 1 / 273.16 of the thermodynamic temperature of the triple point of water (H2O), a temperature variation of 1 K being equivalent to a variation of 1 ° C1. The new definition aims to respect this value, but anchoring it to a fixed value of Boltzmann's constant.

Unlike the degree Celsius, the kelvin is an absolute measure of temperature which was introduced thanks to the third principle of thermodynamics. The temperature of 0 K is equal to −273.15 ° C and corresponds to absolute zero (the triple point of water is therefore at the temperature 0.01 ° C).

The kelvin, not being a relative measure, is never preceded by the word "degree" or the symbol "°", unlike degrees Celsius or Fahrenheit.

The Rankine scale is an absolute scale of thermodynamic temperature named after the Glasgow University engineer and physicist Macquorn Rankine, who proposed it in 1859. Just like the kelvin scale, zero on the Rankine scales is absolute zero, but a temperature difference of one Rankine degree is defined as equal to one Fahrenheit degree, rather than the Celsius degree used on the kelvin scale. Thus, a temperature of 0 K (−273.15 °C; −459.67 °F) is equal to 0 °R, and a temperature of −458.67 °F is equal to 1 °R.

The temperature T in degrees Fahrenheit (°F) is equal to the temperature T in degrees Celsius (°C) times 9/5 plus 32

The temperature T in degrees Celsius (°C) is equal to the temperature T in degrees Fahrenheit (°F) minus 32, times 5/9

The temperature T in kelvin is equal to the temperature T in degrees Celsius (°C) plus 273.15

The temperature T in degrees Rankine (°R) is equal to the temperature T in degrees Celsius (°C) plus 273.15, times 9/5

The temperature T in degrees Rankine (°R) is equal to the temperature T in degrees Fahrenheit (°F) plus 459.67

The temperature T in degrees Celsius (°C) is equal to the temperature T in Rankine (°R) times 9/5, minus 459.67

The temperature T in degrees Fahrenheit (°F) is equal to the temperature T in Rankine (°R) minus 459.67

The temperature T in kelvin is equal to the temperature T in Rankine (°R) times 5/9

The temperature T in degrees Rankine (°R) is equal to the temperature T in kelvin times 9/5

In humans, body temperature is constant (around 37 ° C, but it can vary slightly depending on the time of day from 36.1 ° C to 37.2 ° C), regardless of the outside temperature.

In babies and children, the average body temperature ranges from 97.88°F (36.6°C) to 98.96°F (37.2°C). Adults. Among adults, the average body temperature ranges from 96.98°F (36.1°C) to 98.96°F (37.2°C).

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