How to Calculate Interest Rate per Quarter

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Roofing Calculator: Estimate Shingles & Squares :root { –primary-color: #2c3e50; –accent-color: #e67e22; –bg-color: #f4f7f6; –text-color: #333; –white: #ffffff; –border-radius: 8px; } body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; line-height: 1.6; color: var(–text-color); background-color: var(–bg-color); margin: 0; padding: 20px; } .container { max-width: 800px; margin: 0 auto; background: var(–white); padding: 40px; border-radius: var(–border-radius); box-shadow: 0 4px 6px rgba(0,0,0,0.1); } h1, h2, h3 { color: var(–primary-color); } h1 { text-align: center; margin-bottom: 30px; border-bottom: 2px solid var(–accent-color); padding-bottom: 10px; display: inline-block; width: 100%; } /* Calculator Styles */ .calculator-box { background-color: #ecf0f1; padding: 30px; border-radius: var(–border-radius); border: 1px solid #bdc3c7; margin-bottom: 40px; } .input-group { margin-bottom: 20px; } .input-group label { display: block; margin-bottom: 8px; font-weight: 600; color: var(–primary-color); } .input-group input, .input-group select { width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px; font-size: 16px; box-sizing: border-box; } .input-group input:focus, .input-group select:focus { outline: none; border-color: var(–accent-color); box-shadow: 0 0 5px rgba(230, 126, 34, 0.3); } button.calc-btn { width: 100%; padding: 15px; background-color: var(–accent-color); color: white; border: none; border-radius: 4px; font-size: 18px; font-weight: bold; cursor: pointer; transition: background-color 0.3s; } button.calc-btn:hover { background-color: #d35400; } #results-area { margin-top: 30px; display: none; background: var(–white); padding: 20px; border-radius: var(–border-radius); border-left: 5px solid var(–primary-color); } .result-row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid #eee; } .result-row:last-child { border-bottom: none; } .result-label { font-weight: 500; } .result-value { font-weight: bold; color: var(–primary-color); } .result-value.highlight { color: var(–accent-color); font-size: 1.2em; } /* Article Styles */ .content-section { margin-top: 40px; } .content-section p { margin-bottom: 15px; } .content-section ul { margin-bottom: 20px; padding-left: 20px; } .content-section li { margin-bottom: 10px; } @media (max-width: 600px) { .container { padding: 20px; } .calculator-box { padding: 20px; } }

Roofing Calculator

Flat Roof (0:12) 2:12 (Low Slope) 4:12 (Moderate) 6:12 (Common) 8:12 (Steep) 10:12 (Very Steep) 12:12 (45 Degrees)
5% (Simple Gable) 10% (Standard Hip/Valley) 15% (Complex) 20% (Very Complex)
Total Roof Area: –
Roofing Squares: –
Shingle Bundles Needed: –

How to Estimate Roofing Materials

Replacing a roof is a significant home improvement project, and accurate estimation is crucial to avoid overspending on materials or running short in the middle of the job. This calculator helps you determine the exact amount of shingles needed based on your home's footprint and roof design.

Understanding Roof Pitch

The "pitch" of a roof refers to its slope, specifically how many inches the roof rises for every 12 inches of horizontal run. A steeper roof has a larger surface area than a flat roof covering the same home footprint. Our calculator uses a pitch multiplier to convert your ground-floor square footage into actual roof area.

What are Roofing Squares?

In the roofing industry, materials are measured in "squares." One square equals 100 square feet of roof area. When you talk to contractors or suppliers, they will almost always quote prices per square.

Calculating Bundles

Standard architectural asphalt shingles usually come in bundles. Typically, it takes 3 bundles to cover one square (100 sq ft). However, this can vary slightly by brand or shingle type, so always check the manufacturer's packaging. This calculator assumes the industry standard of 3 bundles per square.

The Importance of Waste Factor

You should never order exactly the amount of material the math dictates. You need extra material to account for:

  • Cutting shingles to fit valleys and hips.
  • Starter rows along the eaves.
  • Ridge caps at the peak.
  • Mistakes during installation.

A simple gable roof might only need 5% waste, while a complex roof with dormers and multiple valleys may require 15-20% extra.

function calculateRoofing() { // 1. Get Input Values by ID var baseAreaInput = document.getElementById("baseArea").value; var pitchMultiplierInput = document.getElementById("roofPitch").value; var wasteFactorInput = document.getElementById("wasteFactor").value; // 2. Validate Inputs if (baseAreaInput === "" || isNaN(baseAreaInput) || baseAreaInput <= 0) { alert("Please enter a valid base area in square feet."); return; } // 3. Parse Numbers var baseArea = parseFloat(baseAreaInput); var multiplier = parseFloat(pitchMultiplierInput); var wastePercent = parseFloat(wasteFactorInput); // 4. Perform Calculations // Calculate raw roof surface area (Base x Pitch Multiplier) var rawRoofArea = baseArea * multiplier; // Add Waste Factor var totalAreaWithWaste = rawRoofArea * (1 + (wastePercent / 100)); // Calculate Squares (1 Square = 100 Sq Ft) var squares = totalAreaWithWaste / 100; // Calculate Bundles (Standard 3 bundles per square) var bundles = Math.ceil(squares * 3); // Round up to nearest whole bundle // 5. Update Results Display document.getElementById("res-totalArea").innerText = totalAreaWithWaste.toFixed(2) + " sq ft"; document.getElementById("res-squares").innerText = squares.toFixed(2) + " squares"; document.getElementById("res-bundles").innerText = bundles + " bundles"; // Show the result container document.getElementById("results-area").style.display = "block"; }

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