Calculate Sq Footage

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Square Footage Calculator

Rectangle / Square Triangle Circle

Total Area Results

Square Feet 0
Square Yards 0
Square Meters 0
Acres 0
function updateSqFtFields() { var shape = document.getElementById("shapeSelector").value; document.getElementById("rectInputs").style.display = (shape === "rectangle") ? "block" : "none"; document.getElementById("triInputs").style.display = (shape === "triangle") ? "block" : "none"; document.getElementById("circleInputs").style.display = (shape === "circle") ? "block" : "none"; } function calculateSqFt() { var shape = document.getElementById("shapeSelector").value; var area = 0; if (shape === "rectangle") { var l = parseFloat(document.getElementById("length").value) || 0; var w = parseFloat(document.getElementById("width").value) || 0; area = l * w; } else if (shape === "triangle") { var b = parseFloat(document.getElementById("base").value) || 0; var h = parseFloat(document.getElementById("height").value) || 0; area = 0.5 * b * h; } else if (shape === "circle") { var r = parseFloat(document.getElementById("radius").value) || 0; area = Math.PI * Math.pow(r, 2); } if (area > 0) { document.getElementById("sqftResult").style.display = "block"; document.getElementById("resSqFt").innerHTML = area.toLocaleString(undefined, {maximumFractionDigits: 2}) + " ft²"; document.getElementById("resSqYd").innerHTML = (area / 9).toLocaleString(undefined, {maximumFractionDigits: 2}) + " yd²"; document.getElementById("resSqM").innerHTML = (area * 0.092903).toLocaleString(undefined, {maximumFractionDigits: 2}) + " m²"; document.getElementById("resAcre").innerHTML = (area / 43560).toLocaleString(undefined, {maximumFractionDigits: 5}); } else { alert("Please enter valid positive dimensions."); } }

How to Calculate Square Footage

Whether you are planning a home renovation, purchasing flooring, or landscaping your garden, knowing how to calculate square footage is a fundamental skill. Square footage is a measurement of area, typically used in the United States to quantify the size of a room or property.

Standard Formulas for Area Calculation

The method you use depends entirely on the shape of the space you are measuring:

  • Rectangle/Square: Length × Width = Square Feet
  • Triangle: (Base × Height) ÷ 2 = Square Feet
  • Circle: π × Radius² = Square Feet (π ≈ 3.14159)

Steps to Measure Your Space

  1. Clear the Area: Ensure you have a clear path for your measuring tape from one wall to the opposite wall.
  2. Measure Dimensions: Measure the length and width in feet. If your measurement includes inches, divide the inches by 12 to convert them to decimal feet. (e.g., 6 inches = 0.5 feet).
  3. Multiply: Use the formulas above to find the total area.
  4. Account for Waste: When buying materials like tile or hardwood, it is industry standard to add 10% to your total square footage to account for cuts and mistakes.

Practical Examples

Example 1: A Standard Bedroom
If a room is 12 feet long and 10 feet wide, the calculation is 12 × 10 = 120 square feet.

Example 2: A Triangular Garden Bed
If you have a corner garden with a base of 8 feet and a height of 6 feet, the area is (8 × 6) / 2 = 24 square feet.

Common Conversions

Sometimes you need your results in different units. Here are the most common conversion factors used in construction:

Convert From To Operation
Square Feet Square Yards Divide by 9
Square Feet Square Meters Multiply by 0.0929
Square Feet Acres Divide by 43,560

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