一個容易的屋頂瓦計算器
An Easy Roof Shingles Calculator. You click on the empty text box below "Enter Total Sq Ft" and you enter your square feet. Then you click on the pitch angle button below that matches your pitch and your total ft with pitch shows the total. It all so tells you how many squares of shingles it is and bundles of shingles. If you don't want the pitch added you just click on "total without pitch"