begin mathsize 36px style K subscript f equals fraction numerator M R T squared over denominator capital delta H subscript f u s end subscript end fraction end style

Kf  = Freezing Point Depression Coefficient ; M = Molecular Weight of the pure solvent ; R = Gas Constant ; T=  Freezing-Point of the pure solvent ; ΔHfus = Heat of Fusion ; 

K kg/mole

Kf

gm/mole

M

Kelvin

T

J/mole

ΔHfus

 
By using this calculator the freezing point depression coefficient can be calculated. This value then can be used to calculate the freezing point depression by using the following calculator : http://calistry.org/calculate/freezingPointDepression

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