Shingle Calculator
Updated Formulas shown
Shingles come in bundles; three bundles cover one square (100 ft²). A 40 × 28 ft house with a 5/12 roof needs about 41 bundles with 12% waste.
Bundles of shingles
41
13.6 squares incl. 12% waste
- Roof surface area
- 1,213 ft²
- Roofing squares (with waste)
- 13.6
- Shingle bundles (3 per square)
- 41
- Pitch multiplier
- 1.083
- Underlayment rolls (4 sq)
- 4
Architectural shingles are usually 3 bundles per square; some heavy designer lines are 4–5. Add starter strip and ridge cap separately.
Related calculators
- Roofing CalculatorFree roofing calculator: house dimensions and pitch to roof area, squares, shingle bundles, underlayment and installed cost.
- Roof Pitch CalculatorConvert rise and run to roof pitch (x/12), angle in degrees, percent slope and area multiplier.
- Roof Square Footage CalculatorTurn your house footprint and roof pitch into actual roof square footage and roofing squares.
Frequently asked questions
How many square feet does a bundle of shingles cover?
About 33.3 ft² for standard 3-bundle-per-square shingles.
Do I need extra shingles for hips and ridges?
Yes — buy ridge cap separately (1 bundle per 20–33 linear ft) and starter strip for the eaves and rakes.
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Estimates only. Check quantities with your supplier or contractor before ordering.