Roofing Shingle Calculator Guide

Estimate roofing squares, shingle bundles, waste, and accessory materials from roof area.

Measure roof planes

Measure each roof plane length and width, then add the areas together.

One roofing square equals 100 square feet. Shingles are often sold by bundle and square.

Steep roofs, valleys, hips, dormers, and cut-up layouts need more waste.

Underlayment, starter, ridge caps, flashing, vents, and nails are separate from field shingles.

How many bundles are in a square?

Many asphalt shingles use three bundles per square, but product packaging controls.

Can I estimate from house footprint?

Only for a rough estimate. Roof pitch and overhangs change actual roof area.

Should roofing be DIY?

Roof work is high risk. Consider professional help for steep or complex roofs.

Open the calculators and enter your dimensions to estimate materials before you shop.