Roofing Calculator
A 2,000 sq ft footprint home at 6:12 pitch needs ~25 squares of roofing = 75 bundles of architectural asphalt shingles. Enter your dimensions for an exact estimate.
Inputs
Estimate
- Total roof surface (with 10% waste)2214 sq ft
- Roofing squares (100 sq ft)Roofing is sold by the square (100 sq ft). 1 square = 3 bundles of shingles.22.14squares
- Shingle bundles (asphalt)3 bundles of asphalt shingles cover 1 square.67bundles
- Underlayment rolls (4 sq each)Each 4-square roll covers 400 sq ft of roof.6rolls
- Material cost — low$7,748
- Material cost — high$12,175
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Try Remodel AI freeHow to calculate roofing materials
Roofing is measured in 'squares' — 1 square = 100 sq ft of roof surface. To calculate roof surface, multiply the home's footprint (top-down area) by a pitch multiplier that accounts for the slope. Add 10% waste for cuts, hips, and valleys.
Pitch is expressed as rise over 12 inches of run. A 6:12 pitch means the roof rises 6 inches for every 12 inches of horizontal distance. Standard pitch multipliers: flat = 1.00, 4:12 = 1.054, 6:12 = 1.118, 8:12 = 1.202, 12:12 = 1.414.
Each square needs 3 bundles of asphalt shingles. Underlayment (synthetic or felt) is sold in 4-square rolls. A typical 2,000 sq ft footprint home at 6:12 pitch needs roughly 24 squares = 72 bundles of shingles + 6 rolls of underlayment.
Formulas used
- Roof surface
footprint × pitch_multiplier × 1.10Footprint is the top-down area. Pitch multiplier accounts for slope. 10% waste is industry standard. - Squares
roof_surface / 1001 square = 100 sq ft. Roofing is sold by the square. - Shingle bundles
squares × 33 bundles of asphalt shingles cover 1 square.
Frequently asked questions
How many shingle bundles do I need for a 2,000 sq ft house?+
A 2,000 sq ft footprint home with a typical 6:12 pitch has about 2,460 sq ft of roof surface = ~25 squares with 10% waste = 75 bundles of asphalt shingles.
How do I figure out my roof pitch?+
Hold a level horizontally against the roof slope. Measure how many inches it rises over 12 inches of horizontal distance. A roof that rises 6 inches over 12 inches is a 6:12 pitch.
How much does a new roof cost in 2026?+
Asphalt 3-tab: $350–$550 per square (materials). Architectural shingles: $450–$700 per square. Metal standing seam: $800–$1,400 per square. Tile: $1,000–$2,000. Slate: $1,500–$3,000. A typical 25-square asphalt re-roof costs $8,500–$13,500 installed.
How many squares are in a roof?+
Divide your total roof surface in square feet by 100 to get squares. A 2,500 sq ft roof = 25 squares. Most residential roofs are 18–35 squares.
How long does an asphalt roof last?+
3-tab asphalt: 15–20 years. Architectural (dimensional) asphalt: 25–30 years. Metal: 40–70 years. Tile and slate: 50–100+ years. Climate, ventilation, and installation quality affect actual lifespan.