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Concrete Slab & Bag Calculator .calc-container { max-width: 800px; margin: 0 auto; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; color: #333; line-height: 1.6; } .calc-box { background: #f8f9fa; border: 1px solid #e9ecef; border-radius: 8px; padding: 30px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); margin-bottom: 40px; } .calc-row { display: flex; flex-wrap: wrap; gap: 20px; margin-bottom: 20px; } .calc-col { flex: 1; min-width: 200px; } label { display: block; font-weight: 600; margin-bottom: 8px; color: #2c3e50; } input[type="number"], select { width: 100%; padding: 12px; border: 1px solid #ced4da; border-radius: 4px; font-size: 16px; box-sizing: border-box; } button.calc-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; } button.calc-btn:hover { background-color: #d35400; } #result-area { margin-top: 30px; display: none; background: #fff; border-left: 5px solid #e67e22; padding: 20px; } .result-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 15px; margin-top: 15px; } .result-item { background: #f1f3f5; padding: 15px; border-radius: 4px; text-align: center; } .result-label { font-size: 0.9em; color: #666; margin-bottom: 5px; } .result-value { font-size: 1.4em; font-weight: bold; color: #2c3e50; } .article-content h2 { color: #2c3e50; margin-top: 40px; } .article-content h3 { color: #e67e22; } .article-content ul { margin-bottom: 20px; } .error-msg { color: #e74c3c; font-weight: bold; display: none; margin-bottom: 10px; }

Concrete Slab & Bag Calculator

Please enter valid dimensions greater than zero.
0% (Exact) 5% (Recommended) 10% (Safe)

Estimated Materials Needed:

Cubic Yards
–
Cubic Feet
–
60lb Premix Bags
–
80lb Premix Bags
–

*Calculations include the selected waste margin. Always round up when purchasing bags.

How to Calculate Concrete for a Slab

Planning a patio, driveway, or shed foundation requires accurate concrete calculations to ensure you order enough material without excessive waste. This calculator determines the total volume required in both Cubic Yards (for truck delivery) and Pre-mix Bags (for smaller DIY projects).

The Formula

To calculate the concrete needed for a rectangular slab, you use the following formula:

Volume (Cubic Feet) = Length (ft) × Width (ft) × Thickness (ft)

Since thickness is usually measured in inches, divide the inches by 12 to convert to feet before multiplying.

  • Example: For a 10′ x 10′ patio that is 4 inches thick:
    10 × 10 × (4 ÷ 12) = 33.33 cubic feet.

Converting to Cubic Yards

If you are ordering ready-mix concrete from a truck, you will need to know the Cubic Yards. There are 27 cubic feet in one cubic yard.

  • Math: 33.33 cubic feet ÷ 27 = 1.23 cubic yards.

How Many Bags Do I Need?

For smaller projects, purchasing bags from a home improvement store is common. The yield of standard bags is approximately:

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

To find the number of bags, divide your total required cubic feet by the bag yield. Don't forget to add a safety margin!

Why Include a Waste Margin?

Professional contractors always include a "waste factor" or "spillage margin" of 5% to 10%. This accounts for:

  • Uneven subgrade depth.
  • Spillage during pouring.
  • Concrete remaining in the mixer or wheelbarrow.
  • Settling of forms.

It is far more expensive to stop a pour to buy two more bags than to buy a few extra upfront.

function calculateConcrete() { // 1. Get input values var length = parseFloat(document.getElementById('slabLength').value); var width = parseFloat(document.getElementById('slabWidth').value); var thickInches = parseFloat(document.getElementById('slabThickness').value); var wastePercent = parseFloat(document.getElementById('wasteFactor').value); // 2. DOM Elements for results and errors var errorBox = document.getElementById('errorMsg'); var resultBox = document.getElementById('result-area'); // 3. Validation if (isNaN(length) || isNaN(width) || isNaN(thickInches) || length <= 0 || width <= 0 || thickInches <= 0) { errorBox.style.display = 'block'; resultBox.style.display = 'none'; return; } // Hide error if valid errorBox.style.display = 'none'; // 4. Calculation Logic // Convert thickness to feet var thickFeet = thickInches / 12; // Calculate raw cubic feet var cubicFeetRaw = length * width * thickFeet; // Add waste factor var totalCubicFeet = cubicFeetRaw * (1 + wastePercent); // Calculate cubic yards (27 cubic feet per yard) var totalCubicYards = totalCubicFeet / 27; // Calculate Bags // 80lb bag yields approx 0.60 cubic feet // 60lb bag yields approx 0.45 cubic feet var bags80 = totalCubicFeet / 0.60; var bags60 = totalCubicFeet / 0.45; // 5. Display Results // Use toFixed(2) for precise measures, Math.ceil for bags (can't buy half bag usually) document.getElementById('resFeet').innerText = totalCubicFeet.toFixed(2); document.getElementById('resYards').innerText = totalCubicYards.toFixed(2); document.getElementById('res80lb').innerText = Math.ceil(bags80); document.getElementById('res60lb').innerText = Math.ceil(bags60); // Show result box resultBox.style.display = 'block'; }

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