RoofFolio
Calculators

Roof geometry + material quantities

Measure the roof. Know the numbers.

Free roofing calculators for rafter geometry, roof pitch, roof area, roofing squares, and shingle quantities.

  1. 1Measure
  2. 2Calculate
  3. 3Check

Open the Rafter Calculatoror start from roof area →

Rafter CalculatorWorked example
1S 20 ftt 1½ inp 6 : 12O 1 ft
CLWALLEAVERIDGE FACER9.9375 ftO1 ft½ S10 ftt1.5 inH4.9688 ftL11.1105 ftE1.118 ftL + E12.2285 ftθ26.5651°126
CLWALLEAVER9.9375 ftO1 ft½ S10 ftt1.5 inH4.9688 ftL11.1105 ftE1.118 ftL + E12.2285 ftθ26.5651°126
2L + E = 11.1105 + 1.118 = 12.2285 ft
3Combined reference line12.2285ftReference geometry only — not a structural sizing result or finished cut length.
4Work it yourselfCheck a single length

Six tools on one roof.

Geometry climbs to the ridge, where pitch becomes the slope factor F. Materials come down the other side: sloping surface, roofing squares, whole bundles.

Geometry dimensions & slope

Materials area & quantities

  1. 01Rafter CalculatorCombined reference linePlan from a building span, ridge thickness and eave overhang.
  2. 02Rafter Length CalculatorSloping reference lengthFind one sloping length from horizontal run and rise or pitch.
  3. 03Roof Pitch CalculatorPitch · angle · slope % · FTranslate rise and run into pitch, degrees and slope percent.
  4. 04Roof Area CalculatorSloping surface areaConvert roof projections into surface area, section by section.
  5. 05Roofing Square CalculatorRoofing squaresConvert surface area to roofing squares, with optional waste.
  6. 06Shingle CalculatorWhole field-shingle bundlesEstimate field-shingle bundles from actual package coverage.

One roof, carried through.

Results hand off between tools at full precision. Waste never travels with them; you choose it where it applies.

1,200 sq ftProjection40 × 30 ft on plan04 · Area1.118034Slope factor Fat 6:1203 · Pitch1,341.6408 sq ftSloping surfacewaste not included04 · Area13.4164 squaresRoofing squaresan area unit05 · Squares45 bundlesField bundleswith 10% and 3 per square*06 · Shingles

* The 10% allowance and 3 bundles per square are example inputs, not recommendations. Use the coverage stated for your exact product.

Reference sheets

The endpoints, areas and coverage figures behind the numbers — with drawings, tables and worked arithmetic.

  1. R1Roof Measurements and Rafter GeometryUnderstand the endpoints behind span, run, rise, pitch and common-rafter reference lengths.
  2. R2Roof Area and Roofing SquaresDistinguish building footprint, horizontal roof projection, sloping surface area and roofing squares.
  3. R3Shingle Coverage and Bundle CountsRead product coverage correctly and separate waste, bundle rounding and roofing accessories.

Reference geometry and material quantities. Not structural design.

RoofFolio calculates

  • Geometric reference lengths for common rafters
  • Pitch, angle, percent slope and area factor
  • Sloping surface area from horizontal projections
  • Roofing squares, with your own optional allowance
  • Whole field-shingle bundles from stated coverage

RoofFolio does not provide

  • Structural engineering or member sizing
  • Load or allowable-span calculations
  • Code-compliance checks
  • Construction approval or cut instructions
  • Product recommendations or purchasing

Calculation methods and precision policy →