Free Calculator

Roof Area Calculator — Squares & Materials

Enter building dimensions and pitch — get total roof area, roofing squares, and full material estimates.

Roof Pitch

Roof Type

Riseinches per 12" of run

Building Lengthfeet

Building Widthfeet

Overhanginches — all sides

Waste Factor

Shingle Type

Area

Footprint

1,120 ft²

building floor area

Pitch Multiplier

1.118

slope correction factor

Net Roof Area

—

before waste factor

Squares (net)

—

1 square = 100 ft²

Squares w/ Waste

—

includes waste factor

Shingle Bundles

—

inc. waste factor

Additional Materials

Underlayment Rolls

—

4 sq per roll (400 ft²)

Ridge Cap Bundles

—

~35 LF per bundle

Drip Edge

—

linear feet

Pitch Multiplier Reference — Gable Roof at 1,000 ft² Footprint

Pitch	Multiplier	1,000 ft² → Area	Squares	Bundles (Arch.)	Type