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Concrete Volume Estimator

Calculate exactly how much concrete you need for slabs, footings, and projects in cubic yards and bags.

0% 5% 10% (Recommended) 15%

Estimated Material Requirements

Total Volume (Cubic Yards): 0
Total Volume (Cubic Feet): 0
80lb Bags (0.6 cu ft each): 0
60lb Bags (0.45 cu ft each): 0
40lb Bags (0.3 cu ft each): 0

How to Calculate Concrete Volume

Estimating concrete accurately is critical for any construction project, whether you are pouring a patio, a driveway, or a foundation footing. Concrete is typically measured and sold by the cubic yard. One cubic yard covers 27 cubic feet.

The Concrete Calculation Formula

To calculate concrete volume manually, follow these steps:

  1. Measure the length and width of your area in feet.
  2. Convert the thickness (depth) from inches to feet by dividing by 12.
  3. Multiply Length × Width × Thickness (in feet) to get total Cubic Feet.
  4. Divide the Cubic Feet by 27 to find the total Cubic Yards.

Example: For a slab that is 10ft long, 10ft wide, and 4 inches thick:
10 × 10 × (4/12 = 0.33) = 33.33 cubic feet.
33.33 / 27 = 1.23 cubic yards.

Why the Waste Factor Matters

Professionals always recommend adding a 10% waste factor. Real-world conditions like uneven subgrades, spillage, and variations in formwork thickness mean you will almost always need slightly more than the theoretical math suggests. It is much cheaper to have a little extra concrete than to run short during a pour, which can result in "cold joints" and structural weaknesses.

Estimating Concrete Bags

If you are using pre-mixed bags for a small project, you need to know the yield of each bag size:

  • 80lb Bag: Yields approximately 0.60 cubic feet.
  • 60lb Bag: Yields approximately 0.45 cubic feet.
  • 40lb Bag: Yields approximately 0.30 cubic feet.

To find the number of bags, take your total cubic feet (including waste) and divide by the yield of the bag size you are purchasing.

Tips for a Successful Concrete Pour

  • Subgrade Preparation: Ensure the ground is compacted and moist before pouring to prevent the soil from sucking moisture out of the wet concrete.
  • Forming: Use sturdy lumber for forms and secure them with enough stakes to prevent bowing under the heavy weight of wet concrete.
  • Curing: Once poured, keep the concrete moist or use a curing compound to ensure it reaches its maximum design strength.
function calculateConcrete() { var length = parseFloat(document.getElementById('conc_length').value); var width = parseFloat(document.getElementById('conc_width').value); var thickness = parseFloat(document.getElementById('conc_thickness').value); var wastePercent = parseFloat(document.getElementById('conc_waste').value); if (isNaN(length) || isNaN(width) || isNaN(thickness) || length <= 0 || width <= 0 || thickness <= 0) { alert("Please enter valid positive numbers for length, width, and thickness."); return; } // Convert thickness to feet var thicknessFeet = thickness / 12; // Calculate cubic feet var cubicFeetBase = length * width * thicknessFeet; // Add waste var totalCubicFeet = cubicFeetBase * (1 + (wastePercent / 100)); // Convert to cubic yards var totalCubicYards = totalCubicFeet / 27; // Bag Calculations var bags80 = Math.ceil(totalCubicFeet / 0.6); var bags60 = Math.ceil(totalCubicFeet / 0.45); var bags40 = Math.ceil(totalCubicFeet / 0.3); // Display results document.getElementById('res_yards').innerText = totalCubicYards.toFixed(2); document.getElementById('res_feet').innerText = totalCubicFeet.toFixed(2); document.getElementById('res_80lb').innerText = bags80; document.getElementById('res_60lb').innerText = bags60; document.getElementById('res_40lb').innerText = bags40; document.getElementById('concrete_results').style.display = 'block'; }

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