Normally I want use this formula for loadcell calibration. C0 and C1 are analog voltage input from ADC. C0 is platform empty value and C1 is with any load value. sifir is kg. value of correspond to C0 value and yuk is kg. value of correspond to C1 value. So two point standart formula is :
adve(kg.) = ((adval-c1)*(yuk-sifir)/(c1-c0)) + yuk

I want use 16-bit ADC IC with 16f877....

Thank You.