Roof Shingle Calculator

Calculate shingle bundles (3 bundles/square), starter courses, hip & ridge cap shingles, and synthetic underlayment rolls.

Actual Sloped Roof Area (sq ft)

Total Ridge & Hip Length (lin ft)

Valley & Ridge Cut Waste (%)

Price per Shingle Bundle ($)

Synthetic Underlayment Roll Area (sq ft)

Shingle Bundle Formula

Field Bundles = Roofing Squares × 3 Bundles/Square × (1 + Waste % / 100)

Bundle Standard: 3 bundles of 3-tab or architectural shingles cover exactly 1 roofing square (100 sq ft).
Hip & Ridge Caps: 1 bundle of specialized ridge cap shingles covers approximately 33 linear feet.
Starter Strips: Applied along the lowest eave line and gable rake edges to prevent wind uplift.

Scenario: Roof surface area of 2,400 sq ft with 60 linear feet of ridge and a 12% cut waste buffer

Calculation Steps:

Result: The project requires 85 total bundles (81 field + 2 ridge + 2 starter) and 3 underlayment rolls, costing $3,078.

Estimates are based on standard national averages and current prevailing construction materials and contractor rates.
Actual trade bids may fluctuate according to local building code requirements, permit fees, and site topography.
Always obtain multiple written bids from licensed, bonded, and insured contractors before commencing work.

How much does a bundle of shingles weigh?

A single bundle of standard architectural shingles weighs approximately 65 to 80 pounds. One square (3 bundles) weighs 200 to 240 pounds.

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