Sell tiles/Harwood products by box quantity

Hi
I am making a woocommerce website for selling tiles, hardwood etc. I want to display per sqft price but sell with box quantity.. But in my website when user enter height and weight..it does not change the box quantity according to the total sqft. total square ft should be divided by the number of square feet in a box to tell you how many boxes you need and charge you per box.. How can i do that?… is there any plugin?…please need some advice

i want like this: https://www.flooranddecor.com/engineered-hardwood-wood/marley-european-oak-wire-brushed-engineered-hardwood-100785872.html

thanks