Roofing Calculators
Use our free roofing calculators to work with roof pitch, slope, rafter geometry, roof dimensions, surface area and related measurements. Each tool is built around a specific calculation so you can get the result you need without working through unnecessary inputs.
Start With the Roof Pitch Calculator
Our main calculator handles the most common roof-pitch calculations and is the best starting point when you need to convert measurements into pitch, angle, slope or related geometry.
Roof Pitch Calculator
Enter the measurements you already know and calculate roof pitch using height and width, rise and run, a known angle or advanced measurement combinations.
Find the Right Roofing Calculator
Search the available calculator library or filter it by the type of roofing problem you are solving. Every published child Page under Calculators appears here automatically.
Featured Calculators
Useful specialist tools
Rafter Length Calculator
Common & shed rafter geometry Results update automatically as you enter measurements. US / Imperial Metric Enter your roof measurements Choose the geometry and slope…
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Roof Area Calculator
Calculate actual sloping roof surface area Use building dimensions, a known plan area, multiple roof sections or a known roof surface area. US / Imperial…
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Roof Height Calculator
Calculate roof rise, ridge height and peak height Work from span, run, pitch, rafter geometry, a height limit or mean roof height. US / Imperial…
Open CalculatorAll Roofing Calculators
5 calculators
Rafter Length Calculator
Common & shed rafter geometry Results update automatically as you enter measurements. US / Imperial Metric Enter your roof measurements Choose the geometry and slope…
Open Calculator
Roof Area Calculator
Calculate actual sloping roof surface area Use building dimensions, a known plan area, multiple roof sections or a known roof surface area. US / Imperial…
Open Calculator
Roof Height Calculator
Calculate roof rise, ridge height and peak height Work from span, run, pitch, rafter geometry, a height limit or mean roof height. US / Imperial…
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Roof Shingle Calculator
Roof Shingle Calculator Estimate asphalt shingle bundles, roofing squares and optional starter, ridge cap, underlayment, drip edge and nails. Asphalt shingle material takeoff 1. What…
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Roofing Cost Calculator
Roofing Cost Calculator Get a realistic planning range for a U.S. roof replacement based on roof size, material, difficulty, tear-off and location. 2026 U.S. pricing…
Open CalculatorHow Our Roofing Calculators Are Built
A useful calculator should do more than return a number. Each tool is designed around a defined mathematical relationship, clear inputs and outputs, and the practical limits of what can be inferred from the measurements entered.
One clear task
Each calculator is built to solve a distinct user problem rather than creating duplicate tools for small keyword variations.
Transparent formulas
The calculation method and assumptions are explained so important results can be checked and understood.
Practical context
Where real roof geometry, product requirements or construction details affect the result, those limitations are made clear.
Connected guidance
Calculators link naturally to relevant guides when the reader needs the method, terminology or measurement process explained in more depth.
Explore Our Roofing Guides
Calculators are designed to give you a result quickly. Our guides explain the geometry, terminology, formulas, worked examples and practical context behind those calculations.