.concrete-calculator-wrapper {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
max-width: 800px;
margin: 0 auto;
background: #fff;
padding: 20px;
border: 1px solid #e0e0e0;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
.cc-header {
text-align: center;
margin-bottom: 25px;
background: #2c3e50;
color: white;
padding: 15px;
border-radius: 6px;
}
.cc-header h2 {
margin: 0;
font-size: 24px;
}
.cc-input-grid {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
margin-bottom: 20px;
}
.cc-input-group {
margin-bottom: 15px;
}
.cc-input-group label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #333;
}
.cc-input-group input, .cc-input-group select {
width: 100%;
padding: 10px;
border: 1px solid #ddd;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
.cc-input-group input:focus {
border-color: #f39c12;
outline: none;
}
.cc-btn {
background-color: #f39c12;
color: white;
border: none;
padding: 15px 30px;
font-size: 18px;
font-weight: bold;
border-radius: 4px;
cursor: pointer;
width: 100%;
transition: background 0.3s;
}
.cc-btn:hover {
background-color: #e67e22;
}
#cc-results {
margin-top: 30px;
padding: 20px;
background-color: #f8f9fa;
border-left: 5px solid #2c3e50;
display: none;
}
.cc-result-item {
display: flex;
justify-content: space-between;
align-items: center;
padding: 10px 0;
border-bottom: 1px solid #eee;
}
.cc-result-item:last-child {
border-bottom: none;
}
.cc-result-label {
font-weight: 600;
color: #555;
}
.cc-result-value {
font-weight: 700;
color: #2c3e50;
font-size: 18px;
}
.cc-highlight {
color: #e67e22;
font-size: 22px;
}
.cc-info {
font-size: 0.9em;
color: #666;
margin-top: 10px;
font-style: italic;
}
@media (max-width: 600px) {
.cc-input-grid {
grid-template-columns: 1fr;
}
}
/* Article Styles */
.cc-article {
margin-top: 40px;
line-height: 1.6;
color: #333;
}
.cc-article h3 {
color: #2c3e50;
margin-top: 25px;
border-bottom: 2px solid #f39c12;
display: inline-block;
padding-bottom: 5px;
}
.cc-article ul {
padding-left: 20px;
}
.cc-article li {
margin-bottom: 10px;
}
function calculateConcrete() {
// Get DOM elements explicitly
var lengthInput = document.getElementById('slabLength');
var widthInput = document.getElementById('slabWidth');
var thickInput = document.getElementById('slabThickness');
var wasteInput = document.getElementById('wastePercent');
var bagSelect = document.getElementById('premixType');
var priceInput = document.getElementById('pricePerYard');
var resultDiv = document.getElementById('cc-results');
// Parse values
var length = parseFloat(lengthInput.value);
var width = parseFloat(widthInput.value);
var thickness = parseFloat(thickInput.value);
var waste = parseFloat(wasteInput.value) || 0;
var bagSize = parseFloat(bagSelect.value);
var price = parseFloat(priceInput.value) || 0;
// Validation
if (isNaN(length) || isNaN(width) || isNaN(thickness) || length <= 0 || width <= 0 || thickness 0) {
document.getElementById('res-cost').innerText = "$" + totalCost.toFixed(2);
} else {
document.getElementById('res-cost').innerText = "N/A";
}
// Show results
resultDiv.style.display = 'block';
}
Concrete Slab & Footing Calculator
80 lb Bags
60 lb Bags
50 lb Bags
Volume (Cubic Feet):
0
Volume (Cubic Yards):
0
Total Premix Bags Needed:
0
Estimated Truck Cost:
$0.00
*Includes selected wastage margin. Standard concrete density assumed at 145 lbs/ft³.
How to Calculate Concrete for Your Project
Whether you are pouring a driveway, a patio, or post footings, determining the correct amount of concrete is crucial. Ordering too little results in "cold joints" and structural weakness, while ordering too much is a waste of money. This calculator helps you determine the exact volume in Cubic Yards (for truck delivery) and the number of Pre-mix Bags (for DIY projects).
The Concrete Formula
To calculate the volume of a rectangular slab, use the following steps:
- Calculate Volume in Cubic Feet: Multiply Length (ft) × Width (ft) × Thickness (ft). Note: Convert inches to feet by dividing by 12.
- Convert to Cubic Yards: Divide the total cubic feet by 27.
- Add Margin: Always add 5-10% for spillage, uneven subgrade, and waste.
Recommended Thickness Guide
- 4 Inches: Standard for walkways, patios, and residential garage floors.
- 5-6 Inches: Recommended for driveways that hold heavier vehicles or RVs.
- 6+ Inches: Heavy-duty commercial aprons or structural foundations.
Truck vs. Bags: Which should I choose?
If your project requires less than 1 cubic yard (approx. 45 bags of 80lb mix), mixing it yourself is usually cost-effective. However, for volumes exceeding 1-2 cubic yards, ordering a ready-mix truck saves significant labor and ensures a consistent cure across the entire slab.
Understanding Pre-Mix Bags
Most home improvement stores sell concrete in 60lb or 80lb bags.
Rule of Thumb: It takes roughly forty-five 80lb bags to make one cubic yard of concrete. Don't forget to account for water weight loss during the curing process when estimating via density.