Roofing Square Calculator

Square Feet to Roofing Squares, Bundles, Nails & Underlayment

One roofing square equals 100 square feet of roof surface, and every quote, bundle count and delivery is written in squares — so converting correctly is the first step in any roofing estimate. The Roofing Square Calculator takes either your measured roof area or your house footprint, applies the pitch multiplier to turn footprint into true sloped surface, adds your waste factor, and returns squares to order rounded the way suppliers sell them, along with shingle bundles at three per square, roofing nails, and underlayment rolls. Simple gable roofs typically use a 10% waste factor while hip roofs, valleys and cut-up roofs run 12-15%. If your roof is a straight rectangle you can enter area directly; if you only know the footprint, choose footprint mode and pick the pitch. Pair it with the Shingle Bundle Calculator for bundle-level detail and the Waste Factor Calculator to fine-tune the overage.