Hey @LukeSvarc, you should be able to do it all with some javascript/jquery directly on Webflow. Something to start with:
var height = parse($('#height').val()); //Get the height
var width = parseInt($('#width').val()); //Get the width
var price = 0.02 //Per mm2
function calc(){
var area = height * width //Get Area
console.log(area * price) //Log the price into browser
}
I think the math needs some adjustment, but its a start