body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
line-height: 1.6;
color: #333;
max-width: 800px;
margin: 0 auto;
padding: 20px;
}
.calculator-wrapper {
background-color: #f8f9fa;
border: 1px solid #e9ecef;
border-radius: 8px;
padding: 25px;
margin-bottom: 40px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}
.calc-header {
text-align: center;
margin-bottom: 25px;
color: #2c3e50;
}
.section-row {
display: flex;
gap: 15px;
margin-bottom: 15px;
align-items: flex-end;
}
.input-group {
flex: 1;
display: flex;
flex-direction: column;
}
.input-group label {
font-size: 0.9em;
margin-bottom: 5px;
font-weight: 600;
color: #555;
}
.input-group input {
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
}
.section-label {
width: 100%;
font-weight: bold;
color: #007bff;
margin-bottom: 5px;
border-bottom: 1px solid #dee2e6;
padding-bottom: 2px;
}
.calc-controls {
margin-top: 20px;
border-top: 2px solid #e9ecef;
padding-top: 20px;
}
button.calculate-btn {
background-color: #007bff;
color: white;
border: none;
padding: 12px 24px;
font-size: 18px;
border-radius: 4px;
cursor: pointer;
width: 100%;
transition: background-color 0.2s;
}
button.calculate-btn:hover {
background-color: #0056b3;
}
.results-area {
margin-top: 25px;
background-color: #fff;
border: 1px solid #dee2e6;
border-radius: 6px;
padding: 20px;
}
.result-row {
display: flex;
justify-content: space-between;
margin-bottom: 10px;
font-size: 1.1em;
}
.result-row.total {
font-weight: bold;
color: #28a745;
font-size: 1.3em;
border-top: 1px solid #eee;
padding-top: 10px;
margin-top: 10px;
}
.article-content {
margin-top: 50px;
}
.article-content h2 {
color: #2c3e50;
margin-top: 30px;
}
.article-content ul {
margin-bottom: 20px;
}
.tip-box {
background-color: #e7f5ff;
border-left: 4px solid #007bff;
padding: 15px;
margin: 20px 0;
}
@media (max-width: 600px) {
.section-row {
flex-direction: column;
gap: 10px;
background: white;
padding: 15px;
border-radius: 5px;
border: 1px solid #eee;
}
}
function calculateCountertop() {
// Retrieve inputs for Section A
var l1 = parseFloat(document.getElementById('len1').value);
var w1 = parseFloat(document.getElementById('wid1').value);
// Retrieve inputs for Section B
var l2 = parseFloat(document.getElementById('len2').value);
var w2 = parseFloat(document.getElementById('wid2').value);
// Retrieve inputs for Section C
var l3 = parseFloat(document.getElementById('len3').value);
var w3 = parseFloat(document.getElementById('wid3').value);
// Retrieve inputs for Section D
var l4 = parseFloat(document.getElementById('len4').value);
var w4 = parseFloat(document.getElementById('wid4').value);
// Cost and Waste
var cost = parseFloat(document.getElementById('costPerSqFt').value);
var waste = parseFloat(document.getElementById('wasteFactor').value);
// Initialize areas
var area1 = 0;
var area2 = 0;
var area3 = 0;
var area4 = 0;
// Calculate areas if inputs are valid numbers
if (!isNaN(l1) && !isNaN(w1)) area1 = (l1 * w1) / 144;
if (!isNaN(l2) && !isNaN(w2)) area2 = (l2 * w2) / 144;
if (!isNaN(l3) && !isNaN(w3)) area3 = (l3 * w3) / 144;
if (!isNaN(l4) && !isNaN(w4)) area4 = (l4 * w4) / 144;
// Sum raw area
var rawTotal = area1 + area2 + area3 + area4;
// Calculate waste
var wasteMultiplier = 1;
if (!isNaN(waste) && waste > 0) {
wasteMultiplier = 1 + (waste / 100);
} else {
waste = 0;
}
var finalTotal = rawTotal * wasteMultiplier;
// Display results
document.getElementById('results').style.display = 'block';
document.getElementById('rawArea').innerText = rawTotal.toFixed(2) + " sq. ft.";
document.getElementById('wasteDisplay').innerText = waste;
document.getElementById('totalArea').innerText = finalTotal.toFixed(2) + " sq. ft.";
// Calculate Cost if provided
if (!isNaN(cost) && cost > 0) {
var totalCost = finalTotal * cost;
document.getElementById('costRow').style.display = 'flex';
document.getElementById('totalCost').innerText = "$" + totalCost.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
} else {
document.getElementById('costRow').style.display = 'none';
}
}
How to Calculate the Square Footage of a Countertop
Whether you are budgeting for granite, quartz, or laminate, accurate measurements are the foundation of a successful kitchen remodel. Calculating the square footage of a countertop involves simple geometry, but specific industry nuances—such as overhangs, backsplashes, and irregular shapes—must be considered to get a precise quote.
The Basic Formula
Countertops are measured in Square Feet (sq. ft.). However, most tape measures use inches. To convert your measurements, use the following formula:
Formula: (Length in inches × Width in inches) ÷ 144 = Square Feet
For example, if you have an island that is 72 inches long and 36 inches wide: 72 × 36 = 2,592 square inches. Dividing 2,592 by 144 gives you exactly 18 square feet.
Step-by-Step Measurement Guide
1. Break It Down into Rectangles
Most kitchens are not a single rectangle. They are often L-shaped or U-shaped. The easiest way to calculate total area is to divide your counter layout into separate rectangular sections (Section A, Section B, etc.). Measure each section independently.
2. Measure "Wall-to-Wall" vs. "Cabinet-to-Cabinet"
If you are replacing an existing countertop, measure the countertop itself, not the cabinets below it. If you are measuring for a new installation on bare cabinets, you must add the overhang.
- Standard Overhang: Usually 1.5 inches past the face of the cabinet.
- Island Overhang: Seating areas typically require 12 to 15 inches of overhang.
Example: If your base cabinets are 24 inches deep, your countertop width (depth) should typically be calculated as 25.5 inches.
3. Don't Forget the Backsplash
If you plan to use the same material for a 4-inch backsplash or a full-height backsplash, this must be calculated separately and added to your total. For a standard 4-inch splash, measure the total length of the back wall and multiply by 4 inches, then divide by 144.
Accounting for Waste and Cutouts
When purchasing slab materials like granite or marble, you cannot simply buy the exact square footage you need. You must account for:
- Waste Factor: Fabricators recommend adding 10% to 15% to your total to account for breakage, trimming, and color matching seams.
- Sink and Cooktop Cutouts: Even though the material where the sink goes will be cut out and discarded, you typically still pay for the full square footage of that area because the fabricator uses a full slab to cut the hole. Do not subtract sink holes from your total area calculation.
Common Countertop Depths
While lengths vary wildly, depths are often standard:
- Standard Kitchen Counter: 25.5 inches
- Bathroom Vanity: 19 to 22.5 inches
- Bar Top: 12 to 18 inches
- Kitchen Island: 36 to 48 inches (depending on seating)
Using the calculator above will help you estimate the material required for your project. Always have a professional fabricator take final template measurements before ordering expensive stone.