Originally UK temperatures were stated in Fahrenheit. On the Fahrenheit scale, the freezing point of water is 32 degrees and the boiling point is 212 degrees. Zero Fahrenheit was the coldest temperature that the German-born scientist Gabriel Daniel Fahrenheit could create with a mixture of ice and ordinary salt. He invented the mercury thermometer and introduced it and his scale in 1714 in Holland, where he lived most of his life.
In the mid 1970's Britain changed to the metric system for temperature using the Celsius scale formerly known as the centigrade scale. The prefix centi-, meaning “100” , is combined with the word grade, which is derived from the Latin word gradus, meaning “step.” Thus, Centigrade means “100 steps”. The Centigrade temperature scale has 100 degrees from the freezing point to the boiling point of water. In 1948 the centigrade scale was renamed to Celsius after the Swedish astronomer and physicist Anders Celsius.
To convert Fahrenheit to Celsius subtract 32, divide by 9 and multiply by 5.
To convert Celsius to Fahrenheit, divide by 5, multiply by 9 and add 32.
Alternatively enter a value in one of the boxes below and click outside the box, the conversion will be shown in the other box
Unit of temperature, named after William Thomson, later known as Lord Kelvin, British mathematician and physicist. The unit is used for scientific purposes and is not in everyday use, it has been included here because it is the base unit for temperature in the SI system.
The zero point of this scale is equivalent to -273.15°C (absolute zero) and is theoretically the lowest possible temperature achievable. 1 Kelvin is equal to 1˚C so the temperature in Kelvin is always 273.15 plus the temperature in Celsius. The Kelvin scale was also known as the "absolute temperature scale". At the freezing point of water, the temperature of the Kelvin scale reads 273.15K. At the boiling point of water, it reads 373.15K.
Page creator - David Haworth.