Conversion tables : Fahrenheit and Celsius (Centigrade)

Fahrenheit is a temperature scale commonly used in the United States and a few other countries. The Fahrenheit scale was invented by the German physicist Daniel Gabriel Fahrenheit in the early 18th century. On the Fahrenheit scale, the freezing point of water is 32 degrees Fahrenheit (°F) and the boiling point of water is 212 °F, both at standard atmospheric pressure.

The Fahrenheit scale is based on a system of degrees that divide the range between the freezing and boiling points of water into 180 equal parts. Therefore, each degree on the Fahrenheit scale is equivalent to 1/180th of the temperature difference between the freezing and boiling points of water.

Celsius, also known as centigrade, is a temperature scale used in the metric system. The Celsius scale was invented by Swedish astronomer Anders Celsius in the mid-18th century. On the Celsius scale, the freezing point of water is 0 degrees Celsius (°C) and the boiling point of water is 100 °C, both at standard atmospheric pressure.

The Celsius scale is based on a system of degrees that divide the range between the freezing and boiling points of water into 100 equal parts. Therefore, each degree on the Celsius scale is equivalent to 1/100th of the temperature difference between the freezing and boiling points of water.

The Celsius scale is widely used around the world in scientific and engineering applications, as well as for everyday measurements of temperature. It is the preferred temperature scale for most international organizations and countries because of its compatibility with the metric system. However, the Fahrenheit scale is still used in the United States and a few other countries for some applications, such as measuring outdoor temperatures and cooking temperatures.

Réaumur is a temperature scale invented by the French physicist and inventor René Antoine Ferchault de Réaumur in the early 18th century. On the Réaumur scale, the freezing point of water is 0 degrees Réaumur (°Ré) and the boiling point of water is 80 °Ré, both at standard atmospheric pressure.

The Réaumur scale is based on a system of degrees that divide the range between the freezing and boiling points of water into 80 equal parts. Therefore, each degree on the Réaumur scale is equivalent to 1/80th of the temperature difference between the freezing and boiling points of water.

The Réaumur scale was widely used in Europe during the 18th and 19th centuries, particularly in France, Germany, and Russia. However, it has largely been replaced by the Celsius scale, which is more compatible with the metric system and provides a more universal standard for measuring temperature. Nonetheless, some historical references and documents still use the Réaumur scale, and some thermometers are still manufactured using this scale.

Conversion formula for Degrees Celsius , Fahrenheit and Réaumur . 

*In the center column, find the temperature to be converted. The equivalent temperature is in the left column, if converting to Celsius, and in the right column, if converting to Fahrenheit.