Find how many roofing squares and shingle bundles your roof needs. Each dimension has its own unit selector (in/ft/yd/m).
Roofing is estimated in squares (100 sq ft of roof). Measure each roof plane (any unit) and add them up. If you measured the footprint from the ground, set your pitch so the area reflects the real sloped surface. Most architectural shingles are 3 bundles per square; add 10-15% for waste, starter, hips and ridges.
Use the shingle calculator to estimate roof area, squares, bundles and cost. It applies a pitch multiplier to footprint measurements and then adds a waste allowance.
Start with the calculator that matches how your material is sold: area, length, volume, count, weight or electrical load. Enter one work area at a time, use the unit selector beside each measurement, then review the order quantity and cost fields before comparing supplier quotes.
Most calculators can save the current estimate in your browser, reload named estimates, print a copy, switch to dark mode or create a shareable link. Those tools are intended for planning and communication; always confirm final quantities, coverage rates, density, code requirements and pricing with the supplier or contractor responsible for the work.