Roofing Shingle Material Calculator

ANA›Life Services Authority›National Calculator Authority›Roofing Shingle Material Calculator

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Roofing Shingle Material Calculator

Calculate the number of shingle squares, bundles, nails, and ridge cap bundles needed for your roofing project based on roof dimensions and pitch.

Roof Length (ft)

Roof Width / Rafter Run (ft) (horizontal distance from eave to ridge)

Roof Pitch (rise per 12 in run, e.g. 6 for 6:12)

Number of Roof Sides / Planes

2 (Gable roof) 4 (Hip roof) 1 (Shed / lean-to)

Waste Factor (%)

Ridge Length (ft) (total length of all ridges and hips)

Calculate

function rooCalc() { var length = parseFloat(document.getElementById('roo-length').value); var width = parseFloat(document.getElementById('roo-width').value); var pitch = parseFloat(document.getElementById('roo-pitch').value); var sides = parseInt(document.getElementById('roo-sides').value); var waste = parseFloat(document.getElementById('roo-waste').value); var ridge = parseFloat(document.getElementById('roo-ridge').value);

var resultDiv = document.getElementById('roo-result'); resultDiv.style.display = 'block';

// --- Validation --- if (isNaN(length) || length ⚠ Please enter a valid Roof Length greater than 0.'; return; } if (isNaN(width) || width ⚠ Please enter a valid Roof Width greater than 0.'; return; } if (isNaN(pitch) || pitch 24) { resultDiv.innerHTML = '⚠ Please enter a valid Pitch between 0 and 24.'; return; } if (isNaN(waste) || waste 50) { resultDiv.innerHTML = '⚠ Please enter a Waste Factor between 0% and 50%.'; return; } if (isNaN(ridge) || ridge ⚠ Please enter a valid Ridge Length (0 or more).'; return; }

// --- Pitch Multiplier --- // Slope factor = sqrt(rise² + 12²) / 12 var slopeFactor = Math.sqrt(pitch * pitch + 144) / 12;

// --- Actual Rafter Length (sloped width) --- var raftLength = width * slopeFactor;

// --- Gross Roof Area (both sides) --- // Area of one plane = length × sloped width var areaOnePlane = length * raftLength; var grossArea = areaOnePlane * sides; // sq ft

// --- Waste-adjusted Area --- var adjustedArea = grossArea * (1 + waste / 100);

// --- Squares (1 square = 100 sq ft) --- var squares = adjustedArea / 100;

// --- Bundles (standard 3-tab shingles: 3 bundles per square) --- var bundlesPerSquare = 3; var bundles = Math.ceil(squares * bundlesPerSquare);

// --- Nails --- // Standard: 4 nails per shingle, ~80 shingles per square // => 320 nails per square; sold in 1-lb boxes (~300 nails/lb for 1.75" roofing nails) var nailsPerSquare = 320; var totalNails = Math.ceil(squares * nailsPerSquare); var nailBoxes = Math.ceil(totalNails / 300); // 1-lb boxes

// --- Ridge Cap Bundles --- // Ridge cap shingles: each bundle covers ~35 linear ft of ridge/hip var ridgeBundles = (ridge > 0) ? Math.ceil(ridge / 35) : 0;

// --- Underlayment Rolls --- // 15-lb felt: 1 roll covers 4 squares (400 sq ft) var underlaymentRolls = Math.ceil(squares / 4);

// --- Display --- resultDiv.innerHTML = '### Results ' + '' + 'Slope Factor' + '' + slopeFactor.toFixed(4) + ' (for ' + pitch + ':12 pitch)' + 'Gross Roof Area' + '' + grossArea.toFixed(1) + ' sq ft' + 'Adjusted Area (incl. ' + waste + '% waste)' + '' + adjustedArea.toFixed(1) + ' sq ft' + 'Squares Needed' + '' + squares.toFixed(2) + ' squares' + 'Shingle Bundles' + '' + bundles + ' bundles (3 bundles/square)' + 'Roofing Nails' + '' + totalNails.toLocaleString() + ' nails ≈ ' + nailBoxes + ' lb box(es)' + (ridge > 0 ? 'Ridge Cap Bundles' + '' + ridgeBundles + ' bundle(s) (covers ' + ridge + ' ft of ridge/hip)' : '') + ' 0 ? '' : ' style="background:#f0f4f8;"') + '>Underlayment (15-lb felt)' + '' + underlaymentRolls + ' roll(s) (1 roll = 4 squares)' + ''; }

#### Formulas Used

1. Slope Factor Slope Factor = √(pitch² + 12²) / 12 Converts horizontal (plan) area to actual sloped surface area.

2. Gross Roof Area Area = Length × (Width × Slope Factor) × Number of Sides

3. Adjusted Area Adjusted Area = Gross Area × (1 + Waste% / 100)

4. Squares Squares = Adjusted Area / 100 (1 square = 100 sq ft)

5. Bundles Bundles = ⌈Squares × 3⌉ (standard 3-tab: 3 bundles/square)

6. Nails Nails = ⌈Squares × 320⌉ (4 nails × ~80 shingles/square) Nail Boxes = ⌈Nails / 300⌉ (~300 nails per 1-lb box of 1¾" roofing nails)

7. Ridge Cap Bundles Ridge Bundles = ⌈Ridge Length / 35⌉ (1 bundle covers ~35 linear ft)

8. Underlayment Rolls = ⌈Squares / 4⌉ (1 roll of 15-lb felt covers ~400 sq ft)

#### Assumptions & References

Roofing Shingle Material Calculator

Roofing Shingle Material Calculator

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References

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