Free calculator

Shingle Calculator

Work out how many squares and bundles of shingles your roof needs. Enter the roof surface, or the house footprint and pitch, and the calculator adds waste, nails and underlayment.

How many shingles do I need?

Roof area2,236 sq ft
Squares incl. waste24.6
Bundles74
Nails (4 per shingle)7,871
Synthetic underlayment3 rolls

Ridge cap and starter shingles are extra: buy them by the linear foot of ridges, hips and eaves. For multi-section roofs and costs, use the full roof calculator.

Bundles of shingles by roof size

Ready-made answers for common sizes, with bundle counts by pitch and waste factor.

100 sq ft200 sq ft300 sq ft400 sq ft500 sq ft600 sq ft700 sq ft800 sq ft900 sq ft1,000 sq ft1,100 sq ft1,200 sq ft1,300 sq ft1,400 sq ft1,500 sq ft1,600 sq ft1,700 sq ft1,800 sq ft1,900 sq ft2,000 sq ft2,200 sq ft2,400 sq ft2,500 sq ft3,000 sq ft3,500 sq ft4,000 sq ft

How the shingle calculation works

Shingles are sold by the square: 100 sq ft of roof. Most shingles come 3 bundles to a square; heavier designer shingles are often 4.

Roof surface = footprint × pitch factor. Squares = roof surface ÷ 100. Bundles = squares × (1 + waste) × bundles per square, rounded up.