Sq Ft Calculator

by
sq ft calculator
Rectangle / SquareTriangleCircle
Answer:
0 sq ft
Total Estimated Cost: $0.00
function updateInputs(){var shape=document.getElementById('shape_type').value;var l1=document.getElementById('label1');var l2=document.getElementById('label2');var r2=document.getElementById('row2′);if(shape==='rect'){l1.innerHTML='Length:';l2.innerHTML='Width:';r2.style.display='table-row';}else if(shape==='tri'){l1.innerHTML='Base:';l2.innerHTML='Height:';r2.style.display='table-row';}else if(shape==='circ'){l1.innerHTML='Radius:';r2.style.display='none';}}function calculateSquareFeet(){var shape=document.getElementById('shape_type').value;var f1=parseFloat(document.getElementById('val1_ft').value)||0;var i1=parseFloat(document.getElementById('val1_in').value)||0;var f2=parseFloat(document.getElementById('val2_ft').value)||0;var i2=parseFloat(document.getElementById('val2_in').value)||0;var price=parseFloat(document.getElementById('price_per_sqft').value)||0;var showSteps=document.getElementById('show_steps').checked;var totalSqFt=0;var stepsHtml=";var dim1=f1+(i1/12);var dim2=f2+(i2/12);if(shape==='rect'){totalSqFt=dim1*dim2;stepsHtml='Formula: Length × Width
'+dim1.toFixed(2)+' ft × '+dim2.toFixed(2)+' ft = '+totalSqFt.toFixed(2)+' sq ft';}else if(shape==='tri'){totalSqFt=0.5*dim1*dim2;stepsHtml='Formula: 0.5 × Base × Height
0.5 × '+dim1.toFixed(2)+' ft × '+dim2.toFixed(2)+' ft = '+totalSqFt.toFixed(2)+' sq ft';}else if(shape==='circ'){totalSqFt=Math.PI*Math.pow(dim1,2);stepsHtml='Formula: π × Radius²
3.14159 × ('+dim1.toFixed(2)+' ft)² = '+totalSqFt.toFixed(2)+' sq ft';}document.getElementById('sqftResult').innerHTML=totalSqFt.toLocaleString(undefined,{minimumFractionDigits:2,maximumFractionDigits:2});if(price>0){var totalCost=totalSqFt*price;document.getElementById('costVal').innerHTML='$'+totalCost.toLocaleString(undefined,{minimumFractionDigits:2,maximumFractionDigits:2});document.getElementById('costResultBlock').style.display='block';stepsHtml+='
Cost: '+totalSqFt.toFixed(2)+' sq ft × $'+price.toFixed(2)+' = $'+totalCost.toFixed(2);}else{document.getElementById('costResultBlock').style.display='none';}if(showSteps){document.getElementById('stepsBlock').innerHTML=stepsHtml;document.getElementById('stepsBlock').style.display='block';}else{document.getElementById('stepsBlock').style.display='none';}document.getElementById('answer').style.display='block';}

Calculator Use

The sq ft calculator is a versatile tool designed to help homeowners, contractors, and real estate professionals accurately measure the area of a space in square feet. Whether you are ordering flooring, buying paint, or planning a landscaping project, knowing the exact square footage is essential to avoid overspending on materials or running short mid-project.

This calculator supports various shapes including rectangles, squares, triangles, and circles. It also includes a price-per-square-foot feature to help you estimate the total cost of materials instantly.

Shape Selection
Choose between Rectangle, Triangle, or Circle depending on the layout of your room or land plot.
Dimensions (Ft and In)
Input your measurements in feet and inches for maximum precision. The calculator automatically converts inches to decimal feet for the final math.
Price per Sq Ft
An optional field where you can enter the cost of your material (e.g., $4.50 for hardwood flooring) to see a total cost estimate.

How It Works

Calculating square footage involves multiplying the linear dimensions of a 2D surface. The math varies depending on the shape of the area you are measuring. The sq ft calculator uses the following standard geometric formulas:

Rectangle Area = Length × Width
Triangle Area = 0.5 × Base × Height
Circle Area = π × Radius²

  • Step 1: Measure the primary dimensions of your area in feet and inches.
  • Step 2: Convert any inch measurements to feet by dividing by 12 (e.g., 6 inches = 0.5 feet).
  • Step 3: Apply the formula for the shape being measured.
  • Step 4: Multiply the result by the unit price if budgeting for materials.

Calculation Example

Example: Suppose you have a rectangular living room that measures 15 feet 6 inches in length and 12 feet in width. You want to buy carpet that costs $3.00 per square foot.

Step-by-step solution:

  1. Convert Length: 15ft 6in = 15 + (6/12) = 15.5 feet.
  2. Convert Width: 12ft 0in = 12.0 feet.
  3. Calculate Area: 15.5 ft × 12 ft = 186 square feet.
  4. Calculate Cost: 186 sq ft × $3.00 = $558.00.
  5. Result = 186 sq ft ($558.00 total)

Common Questions

How do I calculate square footage for an L-shaped room?

To calculate an L-shaped room, divide the space into two separate rectangles. Calculate the square footage of each rectangle individually using the sq ft calculator, then add the two results together for the total area.

Does square footage include walls?

In real estate, "gross living area" usually measures from the exterior walls. However, if you are calculating for flooring or paint, you should measure the interior "clear" space (wall-to-wall) to ensure you don't buy unnecessary materials.

How much extra material should I buy?

It is industry standard to add a "waste factor" of 5% to 10% to your final square footage. This accounts for cuts, mistakes, and future repairs. For diagonal tile patterns, a 15% waste factor is often recommended.

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