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Converting units of temperature differences (also referred to as temperature deltas) is not the same as converting absolute temperature values, and different formulae must be used. To convert a delta temperature from degrees Fahrenheit to degrees Celsius, the formula is {ΔT} °F = 9 / 5 {ΔT} °C.
conversion to kelvin combinations SI: kelvin: K K ... degree Celsius °C (C) °C ([°C]+273.15) ... degree Fahrenheit °F (F) °F
For an exact conversion between degrees Fahrenheit and Celsius, and kelvins of a specific temperature point, the following formulas can be applied. Here, f is the value in degrees Fahrenheit, c the value in degrees Celsius, and k the value in kelvins: f °F to c °C: c = f − 32 / 1.8 c °C to f °F: f = c × 1.8 + 32
To convert °C HDD to °F HDD: = Note that, because HDD are relative to a base temperature (as opposed to being relative to zero), it is incorrect to add or subtract 32 when converting degree days from Celsius to Fahrenheit or vice versa.
Nevertheless, a thermodynamic temperature does in fact have a definite numerical value that has been arbitrarily chosen by tradition and is dependent on the property of particular materials; it is simply less arbitrary than relative "degrees" scales such as Celsius and Fahrenheit. Being an absolute scale with one fixed point (zero), there is ...
An example for which it cannot be used is the conversion between the Celsius scale and the Kelvin scale (or the Fahrenheit scale). Between degrees Celsius and kelvins, there is a constant difference rather than a constant ratio, while between degrees Celsius and degrees Fahrenheit there is neither a constant difference nor a constant ratio.
The degree Celsius (°C) can refer to a specific temperature on the Celsius scale as well as a unit to indicate a temperature interval (a difference between two temperatures). From 1744 until 1954, 0 °C was defined as the freezing point of water and 100 °C was defined as the boiling point of water, both at a pressure of one standard atmosphere.
degree Celsius °C [°C] ≡ [K] − 273.15 [K] ≡ [°C] + 273.15 degree Delisle °De [K] = 373.15 − [°De] × 2 ⁄ 3: degree Fahrenheit °F [°F] ≡ [°C] × 9 ⁄ 5 + 32 [K] ≡ ([°F] + 459.67) × 5 ⁄ 9: degree Newton °N [K] = [°N] × 100 ⁄ 33 + 273.15 degree Rankine °R; [°R] ≡ [K] × 9 ⁄ 5 [K] ≡ [°R] × 5/9 degree ...