Roof Area Calculator

Calculate the total roof area from your building footprint, pitch, and overhang for gable, hip, or shed roof shapes — then see how many roofing squares of material you need to order.

Building Length (ft)

Building Width (ft)

Pitch (rise per 12)

Overhang (in)

Roof Preview

Hover for details • not to scale

Total Roof Area

1409 sq ft

Roofing Squares

14.1

1 square = 100 sq ft

Rafter Length

16.8 ft

Including overhang

Footprint Area

1260 sq ft

Multiplier: ×1.118

Using This Estimate for Material OrdersOrder materials based on roofing squares (14.1 squares). Most shingle bundles cover about 1/3 of a square (33.3 sq ft), so you would need approximately 43 bundles. Always add 10-15% for waste, cuts at ridges, hips, and valleys, and starter/cap shingles.

This is a geometric estimate based on simple roof shapes. Complex roofs with dormers, valleys, or multiple sections should be measured individually. Always verify with on-site measurements before ordering materials.