Product Price based on product variations, and add ones

So I have attributes that show different thicknesses and colors of plastic that we customize and cut to a specific size for customers. I currently allow the customers to enter a length and width and use a measurement price calculator to give the total, but we would like to include some add-ons. For example, we would like to have “Flame Polished Edge” and a few others, but they are by the perimeter, not area like the above calculations. Is there a way to do this so it will calculate the first part, then take the customer’s inputs for length and width to get the perimeter and multiply that by $1.50 and add it to the price of the product? Each product currently has around 50 variations between different thicknesses and colors.