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Concrete Calculator .cc-calculator-wrapper { max-width: 800px; margin: 0 auto; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; color: #333; line-height: 1.6; } .cc-calculator-container { background: #f9f9f9; border: 1px solid #e0e0e0; border-radius: 8px; padding: 30px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); margin-bottom: 40px; } .cc-form-group { margin-bottom: 20px; } .cc-label { display: block; font-weight: 600; margin-bottom: 8px; color: #2c3e50; } .cc-input-row { display: flex; gap: 15px; flex-wrap: wrap; } .cc-input-col { flex: 1; min-width: 200px; } .cc-input { width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px; font-size: 16px; box-sizing: border-box; } .cc-input:focus { border-color: #3498db; outline: none; box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2); } .cc-select { width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px; font-size: 16px; background-color: white; } .cc-btn { background-color: #e67e22; color: white; border: none; padding: 15px 30px; font-size: 18px; font-weight: bold; border-radius: 4px; cursor: pointer; width: 100%; transition: background-color 0.2s; } .cc-btn:hover { background-color: #d35400; } .cc-result-box { margin-top: 25px; padding: 20px; background-color: #fff; border-left: 5px solid #2ecc71; display: none; box-shadow: 0 2px 4px rgba(0,0,0,0.05); } .cc-result-title { font-size: 18px; font-weight: bold; color: #27ae60; margin-bottom: 15px; border-bottom: 1px solid #eee; padding-bottom: 10px; } .cc-result-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 20px; } .cc-metric { background: #f0fdf4; padding: 15px; border-radius: 6px; text-align: center; } .cc-metric-value { display: block; font-size: 24px; font-weight: 800; color: #2c3e50; } .cc-metric-label { display: block; font-size: 13px; text-transform: uppercase; color: #7f8c8d; margin-top: 5px; } .cc-content { margin-top: 40px; } .cc-content h2 { font-size: 24px; color: #2c3e50; margin-top: 0; } .cc-content h3 { font-size: 20px; color: #34495e; margin-top: 25px; } .cc-content p { margin-bottom: 15px; } .cc-content ul { margin-bottom: 15px; padding-left: 20px; } .cc-content li { margin-bottom: 8px; } /* Warning for errors */ .cc-error { color: #e74c3c; font-weight: bold; margin-top: 10px; display: none; } @media (max-width: 600px) { .cc-input-row { flex-direction: column; gap: 0; } .cc-input-col { margin-bottom: 15px; } }
0% (Exact) 5% (Recommended) 10% (High Safety) 15% (Complex Shapes)
Please enter valid positive numbers for all dimensions.
Project Totals (Including Waste)
0 Cubic Yards
0 Cubic Feet
0 80lb Bags
0 60lb Bags

How to Calculate Concrete Requirements

Calculating the correct amount of concrete for your project is crucial to avoid running out mid-pour or wasting money on excess material. This concrete calculator determines the total volume required based on the length, width, and thickness of your slab, footing, or column.

The Concrete Formula

The math behind concrete volume is based on determining cubic footage and converting it to cubic yards, which is the standard unit for ordering ready-mix concrete. The formula used is:

Volume (ft³) = Length (ft) × Width (ft) × [Thickness (in) ÷ 12]

Once you have cubic feet, divide by 27 to get cubic yards. If you are buying pre-mixed bags, you need to know the yield of each bag:

  • 80lb Bag: Yields approximately 0.60 cubic feet.
  • 60lb Bag: Yields approximately 0.45 cubic feet.

Recommended Thickness for Concrete Projects

Choosing the right thickness ensures structural integrity:

  • 4 Inches: Standard for walkways, patios, and residential garage floors.
  • 5-6 Inches: Recommended for driveways that hold heavier vehicles or RVs.
  • 6+ Inches: Necessary for heavy machinery foundations or commercial loading zones.

Why Include a Waste Factor?

We highly recommend including a 5% to 10% waste buffer. Spillage, uneven subgrades, and form bending can lead to requiring more concrete than the exact mathematical volume implies. It is far cheaper to order a little extra than to pay for a "short load" delivery fee for a second truck.

function calculateConcrete() { // 1. Get input values var lenStr = document.getElementById('cc-length').value; var widStr = document.getElementById('cc-width').value; var depthStr = document.getElementById('cc-depth').value; var qtyStr = document.getElementById('cc-quantity').value; var wasteStr = document.getElementById('cc-waste').value; // 2. Parse values var length = parseFloat(lenStr); var width = parseFloat(widStr); var depthInches = parseFloat(depthStr); var quantity = parseFloat(qtyStr); var wasteFactor = parseFloat(wasteStr); // 3. Validation var errorBox = document.getElementById('cc-error-msg'); var resultBox = document.getElementById('cc-result'); if (isNaN(length) || isNaN(width) || isNaN(depthInches) || isNaN(quantity) || length <= 0 || width <= 0 || depthInches <= 0 || quantity <= 0) { errorBox.style.display = 'block'; resultBox.style.display = 'none'; return; } errorBox.style.display = 'none'; // 4. Calculation Logic // Convert depth inches to feet var depthFeet = depthInches / 12; // Calculate Volume in Cubic Feet per item var volumePerItem = length * width * depthFeet; // Total Volume in Cubic Feet var totalCuFt = volumePerItem * quantity; // Add Waste Buffer var totalCuFtWithWaste = totalCuFt * (1 + wasteFactor); // Convert to Cubic Yards (1 Yard = 27 Cubic Feet) var totalCuYards = totalCuFtWithWaste / 27; // Calculate Bags Needed // Standard yield: 80lb bag ~= 0.6 cu ft, 60lb bag ~= 0.45 cu ft var bags80 = totalCuFtWithWaste / 0.6; var bags60 = totalCuFtWithWaste / 0.45; // 5. Update UI resultBox.style.display = 'block'; document.getElementById('val-cu-yards').innerHTML = totalCuYards.toFixed(2); document.getElementById('val-cu-feet').innerHTML = totalCuFtWithWaste.toFixed(2); // Bags must be whole numbers, round up (Math.ceil) document.getElementById('val-bags-80').innerHTML = Math.ceil(bags80); document.getElementById('val-bags-60').innerHTML = Math.ceil(bags60); }

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