Roof Shingle Calculator

Your details

Horizontal length of the roof base, measured from one end to the other.
ft
Horizontal distance from the ridge down to the eave on one side. For a gable roof, measure one slope only.
ft
How many equally-pitched slope panels your roof has. A standard gable roof has 2.
Pitch is how many inches the roof rises for every 12 inches of horizontal run. A 6/12 pitch is the most common residential pitch in North America.
Most standard 3-tab and architectural shingle bundles cover 33.3 sq ft (3 bundles per square). Check the label of your specific product.
sq ft
Extra shingles to account for cuts, ridges, and starter strips. A 10% waste factor is standard for most residential roofs.
Enter the cost of shingles per 100 sq ft (one square) to get a material cost estimate. Leave at 0 to skip.
USD
Shingle type affects individual shingle count. Bundles still cover the same area (33.3 sq ft), but the number of shingles per bundle varies.
Roof squares
19.68squares

Roof area in squares (1 square = 100 sq ft), including waste

Footprint area1,600sq ft
Slope multiplier1.118
Roof area (sloped)1,788.8sq ft
Bundles needed60bundles
Individual shingles4,800shingles
Estimated material cost0USD
Footprint area (sq ft)1,600
Sloped roof area (sq ft)1,788.8

You need 60 bundles covering 19.7 squares.

  • You need 60 bundles of architectural shingles to cover 19.7 squares of roof area (including the 10% waste allowance).
  • Most home improvement stores sell shingles in bundles of 3, so plan to buy in multiples of 3 if stock comes that way.
  • Enter a price per square to get a material cost estimate. Labor typically adds $150 to $300 per square depending on roof complexity and region.

Next stepOrder 1-2 extra bundles as a contingency for future repairs. Matching dye lots are easier to find at the time of the original purchase.

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