Scale Calculator Slider -- 2

looking for Calculator or formula that can calculate any value as input, for start we will do 3 sliders with value in respective of each other when moving the slider it may sound easy, but its complicated one, I'm using very simple example.

I have found a website that can build a costume calculator.

https://app.calconic.com/

please check that out if you are familiar with it.

we can discuss more if you have a background of this.

thanks