Roofing
Roofing Calculators
Free roofing calculators for shingle bundles, roof pitch, slope multipliers, and total roof area. Convert between rise/run, degrees, and percent slope in seconds.
2 calculators · 7 reference pages
All Roofing calculators
Reference
Quick answers for roofing
Quick answer
How Many Bundles Are in a Square of Shingles?
Most asphalt shingles use 3 bundles per square (100 ft² of roof). Heavier architectural shingles can use 4 bundles per square; very lightweight 3-tab shingles sometimes need 4 to match the same area.
Quick answer
How Many Roofing Shingles Are in a Bundle?
An asphalt shingle bundle contains 21 to 29 strips depending on the type. 3-tab shingles have 26 strips per bundle and cover 33.3 ft². Architectural shingles have 21 strips and cover 33.3 ft².
Quick answer
What Is a Square in Roofing?
A roofing square is 100 square feet of roof area — the standard unit roofing materials and labor are sold in.
Quick answer
How Many Square Feet Are in a Bundle of Shingles?
A bundle of asphalt shingles covers about 33.3 square feet — three bundles make one roofing square (100 ft²).
Quick answer
How Many Bundles of Shingles for a 2,000 Sq Ft House?
A 2,000 ft² house with a typical 6/12 roof pitch has about 2,236 ft² of actual roof area = 23 squares = 70 bundles of architectural shingles (3 per square) plus 5 bundles for ridge cap and starter strip. Round up to 75 bundles total.
Quick answer
How Much Does a New Roof Cost in 2026?
A new asphalt-shingle roof on a 2,000 ft² home costs $7,000–$15,000 turnkey in 2026 — about $400–$700 per roofing square installed. Metal roofing runs $11,000–$24,000; clay or concrete tile $18,000–$40,000.
Quick answer
Metal vs Asphalt Roofing: Cost & Lifespan Compared
Metal roofing costs roughly 2× more than asphalt shingles up front ($14,000–$24,000 vs $7,000–$15,000 on a 2,000 ft² home) but lasts 50+ years vs 25 years for asphalt — so the per-year cost is actually lower. Metal wins long-term if you stay in the home 15+ years.
FAQ
Frequently asked
3 bundles for standard 3-tab and most architectural shingles. Heavyweight architectural shingles take 4 bundles per 100 ft² square. Order 1 extra bundle per 10 squares for ridge cap and starter strip.
Multiply your footprint by the pitch multiplier: √(1 + (rise/12)²). A 6/12 roof has a 1.118 multiplier — so 1,200 ft² of footprint becomes 1,342 ft² of roof.