Roofing Calculators
Estimate roofing materials, shingles, and replacement costs.
Planning a roof replacement or repair requires accurate material estimates to stay on budget. Our roofing calculators help homeowners understand material needs and costs before getting contractor quotes, ensuring you can make informed decisions about your roofing project. Roofing calculations involve more than just measuring your roof's footprint. Roof pitch significantly affects the actual surface area. A steep roof requires more materials than a flat roof with the same footprint. Our calculators automatically apply pitch multipliers to give you accurate material quantities. Whether you need to know how many bundles of shingles to order, estimate the total cost of a roof replacement, or understand material waste factors, these tools provide reliable estimates based on industry standards and current market pricing.
Available Calculators
Roofing Calculator
Free roofing calculator to estimate shingles, bundles, and materials needed. Accounts for roof pitch and waste factor for accurate quantities.
Use CalculatorRoof Replacement Cost Calculator
Free roof replacement cost calculator. Estimate materials, labor, tear-off, and total costs. Compare roofing materials and plan your budget.
Use CalculatorAsphalt Shingle Calculator
Free asphalt shingle calculator. Estimate bundles, underlayment rolls, ridge cap, starter strip, drip edge, and nails for 3-tab, architectural, or premium shingles.
Use CalculatorMetal Roof Calculator
Free metal roof calculator. Estimate panels, screws or clips, ridge cap, underlayment, drip edge, and closures for exposed-fastener and standing-seam roofs.
Use CalculatorTile Roof Calculator
Free tile roof calculator. Estimate tile count, hip and ridge tiles, underlayment, battens, fasteners, and deck load for clay and concrete tile roofs.
Use CalculatorRoof Sheathing Calculator
Free roof sheathing calculator. Estimate plywood or OSB sheets, H-clips, nails, and total deck weight for tear-off and re-deck projects.
Use CalculatorRoof Underlayment Calculator
Free roof underlayment calculator. Estimate rolls of 15 lb felt, 30 lb felt, synthetic, or peel-and-stick underlayment with overlap, layers, and ice & water shield.
Use CalculatorRoof Pitch Calculator
Free roof pitch calculator. Convert rise over run into pitch ratio (X/12), angle in degrees, slope percentage, slope multiplier, and IRC pitch category.
Use CalculatorRelated guides
How to Measure a Roof: A Step-by-Step Guide for Homeowners
Learn how to measure a roof accurately — from the ground or on top — with pitch adjustments, shape formulas, and a free roofing calculator to convert measurements to materials.
Read guideHow to Calculate Roofing Squares
Learn how to calculate roofing squares step by step. Convert square footage to squares, add the right waste factor, and estimate shingle bundles for any roof.
Read guideHow to Calculate Shingles Needed
Learn how to calculate shingles needed for your roof. Use our shingle calculator to get exact bundle counts with waste factor included.
Read guideHow to Calculate Metal Roof Panels
Learn how to calculate metal roof panels from roof width, panel coverage, and waste factor, with worked examples and our metal roof calculator.
Read guideHow to Calculate Tile Roofing
Learn how to calculate tile roofing for any roof size. Use our tile roof calculator to get exact tile count, courses, and waste factor.
Read guideHow to Calculate Roof Sheathing
Learn how to calculate roof sheathing sheets from roof area with a clear formula, thickness chart, and waste factor — plus our roofing calculator.
Read guideHow to Calculate Roof Underlayment
Learn how to calculate roof underlayment rolls for any roof size. Get exact coverage, overlap, and waste factor with our step-by-step guide.
Read guideAverage Cost to Replace a Roof: 2026 Price Breakdown
See average roof replacement costs by material, house size, and labor. Use our roof replacement cost calculator for an instant estimate for your home.
Read guideRoofing Materials Comparison: Cost, Lifespan, and Best Use Cases
Compare roofing materials by cost, lifespan, and durability. See asphalt, metal, tile, and slate side-by-side to pick the best roof for your home.
Read guideWhat Is Roof Pitch? Guide, Chart, and Multipliers
Learn what roof pitch is, how it's measured (rise over run), and use our roof pitch chart with multipliers to calculate your true roof area.
Read guideHow Long Does a Roof Last By Material?
See how long every roof type lasts — asphalt, metal, tile, slate, wood. Compare lifespans and estimate replacement cost in seconds.
Read guide12 Signs You Need a New Roof
See the 12 clearest signs you need a new roof — from curling shingles to sagging decks. Estimate your replacement cost in seconds.
Read guideAsphalt Shingles vs Metal Roof: Which Is Better for Your Home?
Compare asphalt shingles vs metal roofing on cost, lifespan, and durability. See which roof type fits your home and budget best.
Read guideWaste Factor Guide: How Much Extra Material to Order
Learn how much waste factor to add for roofing, flooring, drywall, tile, and decking. Standard waste percentages and when to use them.
Read guideSquare Feet vs Square Yards: Conversion Formula and Guide
Convert square feet to square yards with the simple ÷9 rule. Use our square footage calculator for instant conversion on carpet, concrete, and flooring projects.
Read guideFrequently Asked Questions
What is a roofing square?
A roofing square is 100 square feet of roof area. Roofing materials like shingles are typically sold and priced per square. Three bundles of standard shingles cover one square.
How does roof pitch affect material needs?
Steeper roofs have more surface area than their footprint suggests. A 6/12 pitch roof requires about 12% more material than a flat roof, while a 12/12 pitch needs about 41% more.
What waste factor should I use for roofing?
Standard waste factor is 10-15% for simple roofs. Complex roofs with many valleys, dormers, or hips may need 15-20% waste factor to account for additional cutting.