Roofing Cost Estimator

ANA›Life Services Authority›National Calculator Authority›Roofing Cost Estimator

.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }

Roofing Cost Estimator

Estimate the total cost of a roofing project based on roof dimensions, pitch, material type, and local labor rates.

Roof Length (ft)

Roof Width (ft)

Roof Pitch (rise:12 run)

Flat / Low Slope (1:12) — factor 1.003 2:12 — factor 1.014 3:12 — factor 1.031 4:12 — factor 1.054 5:12 — factor 1.083 6:12 — factor 1.118 7:12 — factor 1.158 8:12 — factor 1.202 9:12 — factor 1.250 10:12 — factor 1.302 11:12 — factor 1.357 12:12 — factor 1.414

Roofing Material

3-Tab Asphalt Shingles — $1.50/sq ft Architectural Asphalt Shingles — $2.50/sq ft Metal Roofing (Steel) — $4.00/sq ft Metal Roofing (Aluminum) — $7.00/sq ft Cedar Wood Shakes — $9.00/sq ft Slate Tiles — $12.00/sq ft Clay / Concrete Tiles — $10.00/sq ft EPDM Rubber (flat roofs) — $8.00/sq ft Standing Seam Metal — $15.00/sq ft

Labor Rate ($/sq ft)

Number of Stories

1 Story — no surcharge 2 Stories — +15% labor 3+ Stories — +30% labor

Waste & Overlap Factor (%)

Include Tear-Off of Old Roof?

No Yes — $1.00/sq ft Yes (2 layers) — $1.50/sq ft

Underlayment Cost ($/sq ft)

Contractor Overhead & Profit (%)

Calculate

function rooCalc() { // --- Gather inputs --- var length = parseFloat(document.getElementById('roo-length').value); var width = parseFloat(document.getElementById('roo-width').value); var pitchFactor = parseFloat(document.getElementById('roo-pitch').value); var matCost = parseFloat(document.getElementById('roo-material').value); var laborRate = parseFloat(document.getElementById('roo-labor').value); var storyFactor = parseFloat(document.getElementById('roo-stories').value); var wastePct = parseFloat(document.getElementById('roo-waste').value); var tearOff = parseFloat(document.getElementById('roo-tearoff').value); var underlayment = parseFloat(document.getElementById('roo-underlayment').value); var overheadPct = parseFloat(document.getElementById('roo-overhead').value);

// --- Validation --- var errors = []; if (isNaN(length) || length 30) errors.push("Waste factor must be between 5% and 30%."); if (isNaN(underlayment) || underlayment 50) errors.push("Overhead must be between 0% and 50%.");

var resultDiv = document.getElementById('roo-result'); if (errors.length > 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ ' + errors.join('⚠ ') + ''; return; }

// --- Core Calculations ---

// Step 1: Flat (plan) area var flatArea = length * width; // sq ft

// Step 2: Actual roof surface area adjusted for pitch // Pitch factor = sqrt(1 + (rise/12)^2), pre-selected from dropdown var actualArea = flatArea * pitchFactor; // sq ft

// Step 3: Area with waste & overlap var areaWithWaste = actualArea * (1 + wastePct / 100); // sq ft

// Step 4: Roofing squares (1 square = 100 sq ft) var roofingSquares = areaWithWaste / 100;

// Step 5: Material cost var materialTotal = areaWithWaste * matCost;

// Step 6: Labor cost (adjusted for stories) var laborTotal = areaWithWaste * laborRate * storyFactor;

// Step 7: Underlayment cost var underlaymentTotal = areaWithWaste * underlayment;

// Step 8: Tear-off cost (applied to actual area, no waste needed) var tearOffTotal = actualArea * tearOff;

// Step 9: Subtotal before overhead var subtotal = materialTotal + laborTotal + underlaymentTotal + tearOffTotal;

// Step 10: Overhead & profit var overheadTotal = subtotal * (overheadPct / 100);

// Step 11: Grand total var grandTotal = subtotal + overheadTotal;

// Step 12: Cost per sq ft (based on flat area for easy comparison) var costPerSqFt = grandTotal / flatArea;

// --- Format currency --- function fmt(n) { return '$' + n.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ','); } function fmtN(n, d) { return n.toFixed(d !== undefined ? d : 1).replace(/\B(?=(\d{3})+(?!\d))/g, ','); }

// --- Output --- var html = '### 🏠 Roofing Cost Estimate '; html += '';

var rows = [ ['Flat (Plan) Area', fmtN(flatArea, 1) + ' sq ft', ''], ['Pitch Adjustment Factor', '× ' + pitchFactor.toFixed(3), ''], ['Actual Roof Surface Area', fmtN(actualArea, 1) + ' sq ft', ''], ['Waste & Overlap (' + wastePct + '%)', fmtN(areaWithWaste, 1) + ' sq ft', ''], ['Roofing Squares Needed', fmtN(roofingSquares, 2) + ' squares', ''], ['', '', ''], ['Material Cost', fmtN(areaWithWaste,1) + ' sq ft × ' + fmt(matCost) + '/sq ft', fmt(materialTotal)], ['Labor Cost', fmtN(areaWithWaste,1) + ' sq ft × ' + fmt(laborRate) + ' × ' + storyFactor.toFixed(2) + ' (stories)', fmt(laborTotal)], ['Underlayment', fmtN(areaWithWaste,1) + ' sq ft × ' + fmt(underlayment) + '/sq ft', fmt(underlaymentTotal)], ['Tear-Off Cost', tearOff > 0 ? fmtN(actualArea,1) + ' sq ft × ' + fmt(tearOff) + '/sq ft' : 'Not included', tearOff > 0 ? fmt(tearOffTotal) : '$0.00'], ['Subtotal', '', fmt(subtotal)], ['Overhead & Profit (' + overheadPct + '%)', '', fmt(overheadTotal)], ];

rows.forEach(function(r) { if (r[0] === '') { html += ''; return; } var isTotal = r[0].indexOf('Total') !== -1 || r[0].indexOf('Overhead') !== -1; var style = isTotal ? 'font-weight:600;border-top:1px solid #ccc;' : ''; html += ''; html += '' + r[0] + ''; html += '' + r[1] + ''; html += '' + r[2] + ''; html += ''; });

html += ''; html += '✅ Grand Total Estimate'; html += '' + fmt(grandTotal) + ''; html += ''; html += ''; html += 'Cost per Flat Sq Ft'; html += '' + fmt(costPerSqFt) + '/sq ft'; html += ''; html += '';

resultDiv.style.display = 'block'; resultDiv.innerHTML = html; }

#### Formula

1. Flat Area = Length × Width 2. Actual Roof Area = Flat Area × Pitch Factor Pitch Factor = √(1 + (rise/12)²) 3. Area with Waste = Actual Area × (1 + Waste% / 100) 4. Material Cost = Area with Waste × Material Rate ($/sq ft) 5. Labor Cost = Area with Waste × Labor Rate × Story Factor 6. Underlayment Cost = Area with Waste × Underlayment Rate 7. Tear-Off Cost = Actual Area × Tear-Off Rate 8. Subtotal = Material + Labor + Underlayment + Tear-Off 9. Overhead = Subtotal × (Overhead% / 100) 10. Grand Total = Subtotal + Overhead 11. Roofing Squares = Area with Waste / 100 (1 square = 100 sq ft)

#### Assumptions & References

Roofing Cost Estimator

Roofing Cost Estimator

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References

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