Temperature Conversion

Kelvin, Celcius and Fahrenheit

C = ( F + 32 ) ÷ 1.8
C = K + 273.15
F = ( C x 1.8 ) + 32
F = ( K x 1.8 ) - 459.67
K = ( F ÷ 1.8 ) - 255.37
K = C + 273.15

NOTE - It is impossible to precisely convert temperatures for various reasons including

Readings of a fixed temperature can vary, depending what type of device is used
Most temperature recorders are only accurate to about one degree
The definition of some temperature scales is not precise. Using a fixed number of divisions between two known temperatures is not adequete when small changes are being measured.
In normal circumstances, errors of under one degree may not be important but in certain fields e.g. Global Warming, it is vital to ensure that all readings are taken with devices synchronised thoughout the expected temprature range.

Ovens

NOTES

The readings on most oven temperature knobs are approximate. Few can be read to within ±5 C
Oven temperatures can vary between manufacturers and models
Many ovens are hotter near the top than they are at their bases
Fan ovens sometimes cook faster than non-fan ovens
The gas mark ¼, ½ or 10 settings (and equivilent C °F) are not available on many ovens
Some countries have used scales that appear similar to gas marks but do not match the UK temperatures