colors - Calculting colours based on contrast -

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i hi have website runs several colour themes. want change text select colour based on colour theme. 

p::selection,   li::selection,   div::selection{     background-color: #hex;     color: #ffffff;   }

i'm using -moz , -o prefixes.

for colour theme i'm using #274569 default colour of #339aff acceptable , i've calculated contrast. want work out how calculate colour (#148545 example) if have contrast.
there no shortage of resources web calculate contrast of 2 colours i'm after doing other way round, unless there better way of choosing colour. there way this?


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