Actually they all do. They all measure temperature in units called degrees. The difference is the starting point.
The Kelvin scale starts at zero (never goes into negative figures) - which is -273 Celsius or 459.4 Fahrenheit.
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Celsius and Kelvin
-40 degrees is the same degree in Fahrenheit and Celsius.
Celsius and Kelvin scales have the same unit, but they start at different temperatures. 0 Celsius is the freezing pt of water, but 0 Kelvin is absolute zero (the coldest temperature possible)
The 'kelvin' and the celsius 'degree' are identical temperature intervals ... they are the same size. The marks on the kelvin thermometer and the marks on the celsius thermometer are the same distance apart. Both scales have 100 divisions between the freezing and boiling temperatures of water, but the scales start at different places. (Kelvin starts at 'absolute zero', celsius starts at the freezing temperature of water.) The graphs of these two scales are parallel lines. The graphs never intersect, meaning that there is no temperature where kelvin and celsius are the same number.
You don't need to convert. The scales are the same. It's a measure of change, rather than an absolute temperature, so it's the same thing.