Countertop Square Footage Calculator
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body {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background-color: var(–light-background);
color: var(–text-color);
line-height: 1.6;
margin: 0;
padding: 20px;
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justify-content: center;
align-items: flex-start;
min-height: 100vh;
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.loan-calc-container {
background-color: var(–card-background);
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max-width: 600px;
margin: 20px auto;
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h1, h2 {
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margin-bottom: 20px;
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.input-group {
margin-bottom: 20px;
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.input-group label {
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margin-bottom: 8px;
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.result-section h3 {
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#calculated-area {
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Countertop Square Footage Calculator
Total Countertop Area
0.00 sq ft
Understanding Countertop Square Footage
Accurately measuring the square footage of your countertops is a crucial first step for any renovation or material purchase. Whether you're buying granite, quartz, laminate, or butcher block, the cost and quantity are almost always based on the total surface area you need. This calculator simplifies that process.
How it Works: The Math Behind the Measurement
Calculating the square footage of a rectangular or L-shaped countertop is straightforward geometry. The fundamental formula for the area of a rectangle is:
Area = Length × Width
For a standard rectangular countertop, you'll simply measure its length and width in feet and multiply them together. The result will be in square feet (sq ft).
Handling Complex Shapes (e.g., L-Shapes and Islands):
If your countertop has an L-shape, you can break it down into two separate rectangles. Measure the length and width of each rectangle and calculate their areas individually. Then, add these two areas together to get the total square footage. For example:
- Rectangle A: Length A × Width A = Area A
- Rectangle B: Length B × Width B = Area B
- Total Area = Area A + Area B
This calculator simplifies this by allowing you to input the dimensions of your main countertop run and then optionally add measurements for island sections.
Important Considerations:
- Units: Always measure in feet for this calculator. If you measure in inches, convert inches to feet by dividing by 12 (e.g., 30 inches / 12 = 2.5 feet).
- Edge Cases: Measure to the furthest point of your countertop run.
- Overhang: Typically, countertop material is purchased to cover the base cabinet dimensions, not including any decorative overhang. However, if you need to account for overhang, ensure your measurements include it.
- Waste Factor: It's standard practice to add a waste factor (usually 10-20%) to your total square footage when ordering materials. This accounts for cuts, mistakes, and matching patterns. While this calculator provides the exact measured area, remember to factor in waste when placing your order.
Why Use a Square Footage Calculator?
Using a calculator like this ensures accuracy and saves time. It helps you:
- Get Accurate Material Estimates: Avoid over- or under-ordering costly countertop materials.
- Compare Quotes: Understand quotes from different fabricators or suppliers based on a consistent measurement.
- Budget Effectively: Know the approximate material quantity needed to budget for your kitchen or bathroom project.
Input your countertop dimensions easily and get your precise square footage calculation in seconds!
function calculateSquareFootage() {
var length = parseFloat(document.getElementById("length").value);
var width = parseFloat(document.getElementById("width").value);
var numIslands = parseInt(document.getElementById("numIslands").value);
var islandLength = parseFloat(document.getElementById("islandLength").value);
var islandWidth = parseFloat(document.getElementById("islandWidth").value);
var totalArea = 0;
// Validate main countertop dimensions
if (isNaN(length) || isNaN(width) || length <= 0 || width 0) {
if (isNaN(islandLength) || isNaN(islandWidth) || islandLength <= 0 || islandWidth <= 0) {
alert("Please enter valid positive numbers for Island Section Length and Width.");
return;
}
// Assuming all island sections have the same dimensions for simplicity in this basic calculator
// For more complex scenarios with different island sizes, separate inputs would be needed.
totalArea += numIslands * islandLength * islandWidth;
}
document.getElementById("calculated-area").innerHTML = totalArea.toFixed(2) + '
sq ft';
}
// Show/hide island dimensions based on the number of islands
var numIslandsInput = document.getElementById("numIslands");
numIslandsInput.addEventListener("input", function() {
var numIslands = parseInt(this.value);
var islandDimensionInputs = document.querySelectorAll(".island-dimensions");
if (numIslands > 0) {
for (var i = 0; i 0
document.getElementById("islandLength").setAttribute("required", "true");
document.getElementById("islandWidth").setAttribute("required", "true");
} else {
for (var i = 0; i 0) {
for (var i = 0; i < islandDimensionInputs.length; i++) {
islandDimensionInputs[i].style.display = "flex";
}
document.getElementById("islandLength").setAttribute("required", "true");
document.getElementById("islandWidth").setAttribute("required", "true");
} else {
for (var i = 0; i < islandDimensionInputs.length; i++) {
islandDimensionInputs[i].style.display = "none";
}
document.getElementById("islandLength").removeAttribute("required");
document.getElementById("islandWidth").removeAttribute("required");
}
});