Roofing Calculators
Free tools for every step from measuring the roof to ordering material. Each one explains its formula and assumptions.
Roof pitch
Roof pitch calculatorRise and run to pitch, angle and multipliersPitch to degreesConverter plus a chart from 1/12 to 24/12Add for pitchHow much area the slope addsFind your roof pitchTwo easy ways, plus from the groundRoof pitch examplesWhat each pitch looks like and allows
Measure and area
Roof area calculatorFootprint and pitch to square feetMeasure a roof (multi-section)Plane-by-plane area for complex roofsRoofing squaresSquare feet to squares and bundlesRafter lengthSpan, pitch and overhang to rafter length and cutsGutter size5" or 6" gutters and downspouts
Materials and takeoff
Shingle calculatorComplete takeoff: bundles to nailsShingle bundlesBundles by shingle type, plus starter and capWaste factorHow much extra to orderMetal roofingPanels, cut length and screwsUnderlaymentSynthetic, felt and ice and water rollsDrip edge and ridge capEdge metal, cap and starterNails per squareNail counts, coils and boxesRoofing nail sizeMinimum nail length for your job
Cost
Roof replacement cost2026 ranges by material, with sourcesCompare roofing materialsCost, lifespan, weight and pitch side by side
Pitch-by-pitch pages
1/12 · 2/12 · 3/12 · 4/12 · 5/12 · 6/12 · 7/12 · 8/12 · 9/12 · 10/12 · 11/12 · 12/12
For roofers: the takeoff calculators above are the start of a larger free toolkit for pros. Bookmark this page.