min/max and adding quantity

[jimmie]

i Use a flooring calculator on some of my product pages, you input the sqft you need in a field it populates the quantity field with the sqft need based on the min/max than they hit add to cart. i have a plus and minus buttons for quantity add and subtract. if they add with calculator will always spit out decimal, if they hit the plus it will only add 1 when i want it to add 23.13 sq ft. per box. how can i make the plus look at the min/max and if something there then add or subtract the min/max quantity.

[mc12345678]

This may be easier to address by providing information that would help someone to see the page in question.

[jimmie]

here is a product
https://jnsflooringandsupplies.com/F..._Plymouth_0124