Tennessee Tax Rate Calculator

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Concrete Slab & Driveway Calculator
0% (Exact) 5% (Standard) 10% (Recommended) 15% (Safe)
Please enter valid dimensions.
Total Volume Needed: 0 Cubic Yards
Volume in Cubic Feet: 0 ft³
Pre-Mix Bags (80lb): 0 bags
Pre-Mix Bags (60lb): 0 bags
Estimated Truck Cost: $0.00

How to Calculate Concrete for Slabs and Driveways

Whether you are pouring a new patio, a driveway extension, or a shed foundation, knowing exactly how much concrete to order is critical. Ordering too little results in expensive "short load" fees or cold joints in your slab, while ordering too much is a waste of money.

This calculator determines the volume of concrete required based on the dimensions of your project, converting cubic feet into cubic yards (the standard unit for ordering from ready-mix trucks) and pre-mix bags (for smaller DIY jobs).

The Concrete Formula

The math behind calculating concrete volume involves three steps:

  1. Calculate Volume in Cubic Feet: Multiply Length (ft) × Width (ft) × Thickness (ft). Note: You must convert the thickness from inches to feet by dividing by 12.
  2. Convert to Cubic Yards: Divide the total cubic feet by 27 (since there are 27 cubic feet in one cubic yard).
  3. Add Waste Margin: Always add 5-10% to account for spillage, uneven subgrades, and form spreading.

Standard Thickness Recommendations

Choosing the right thickness is essential for the durability of your slab:

  • 4 Inches: Standard for residential sidewalks, patios, and garage floors for passenger cars.
  • 5-6 Inches: Recommended for driveways that hold heavier SUVs, trucks, or RVs.
  • 6+ Inches: Heavy-duty foundations or commercial aprons.

Truck vs. Bags: When to DIY?

If your project requires less than 1 cubic yard (about 45 bags of 80lb concrete), mixing by hand or with a small rental mixer is cost-effective. However, once you exceed 1 to 1.5 cubic yards, ordering a ready-mix truck is usually cheaper and guarantees a more consistent strength and finish. A standard concrete truck holds 9-10 cubic yards.

Pro Tip: When ordering a truck, ask for "4000 PSI" mix for driveways in freeze-thaw climates to prevent cracking and scaling.

function calculateConcrete() { var length = parseFloat(document.getElementById('cLength').value); var width = parseFloat(document.getElementById('cWidth').value); var thicknessInches = parseFloat(document.getElementById('cThickness').value); var pricePerYard = parseFloat(document.getElementById('cPrice').value); var wastePercent = parseFloat(document.getElementById('cWaste').value); var errorDiv = document.getElementById('errorMsg'); var resultsDiv = document.getElementById('results'); // Validation if (isNaN(length) || isNaN(width) || isNaN(thicknessInches) || length <= 0 || width <= 0 || thicknessInches <= 0) { errorDiv.style.display = 'block'; resultsDiv.classList.remove('active'); return; } errorDiv.style.display = 'none'; // Logic // 1. Convert thickness to feet var thicknessFeet = thicknessInches / 12; // 2. Calculate Cubic Feet var rawCuFt = length * width * thicknessFeet; // 3. Apply Waste Factor var wasteMultiplier = 1 + (wastePercent / 100); var totalCuFt = rawCuFt * wasteMultiplier; // 4. Convert to Cubic Yards (1 yard = 27 cu ft) var totalCuYards = totalCuFt / 27; // 5. Calculate Bags // Yield: 80lb bag ~= 0.60 cu ft, 60lb bag ~= 0.45 cu ft var bags80 = Math.ceil(totalCuFt / 0.60); var bags60 = Math.ceil(totalCuFt / 0.45); // 6. Calculate Cost (Price only applies to yardage usually, but we estimate based on volume) // Most plants have a minimum load (e.g. 3-4 yards), but we calc raw material cost here. var estimatedCost = totalCuYards * pricePerYard; // Update Display document.getElementById('resYards').innerText = totalCuYards.toFixed(2); document.getElementById('resCuFt').innerText = totalCuFt.toFixed(1); document.getElementById('resBags80').innerText = bags80; document.getElementById('resBags60').innerText = bags60; document.getElementById('resCost').innerText = estimatedCost.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); resultsDiv.classList.add('active'); }

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