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Roof Shingle Estimator

Shingle bundles, squares, underlayment, starter, ridge cap, and drip edge from your roof footprint and pitch — with waste built in.

Frequently asked

FAQ

How many bundles of shingles do I need?
Multiply your roof footprint by the pitch multiplier to get the sloped area, divide by 100 for squares, multiply by 3 bundles per square, and add ~10% waste. The calculator does this and rounds up to whole bundles.
What is a roofing square?
One square equals 100 square feet of roof surface. Standard 3-tab and most architectural shingles come 3 bundles to a square, so each bundle covers about 33 square feet.
Should I enter footprint or sloped area?
Enter the footprint — the plan area as seen straight down. The pitch multiplier (for example ×1.118 for a 6:12 roof) converts it to the true sloped surface. Entering a sloped measurement double-counts the pitch and over-orders.

Rooms you can plan with this tool

Real-room inspiration that uses this tool's outputs.

bathroom

Coastal bathroom — board-and-batten, white tile, brushed brass done right

coastal, traditional

outdoor

Coastal patio — bluestone, teak, slow drift of ferns

coastal, traditional

bathroom

Farmhouse bathroom — clawfoot tub, beadboard, hex tile floor

farmhouse, traditional, coastal