Sqft Calculator

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sqft calculator
Rectangle / SquareCircleTriangle
Results:
Area: sq ft
Total Cost:
function toggleInputs(){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 (ft):';l2.innerHTML='Width (ft):';r2.style.display='table-row';}else if(shape==='circle'){l1.innerHTML='Diameter (ft):';r2.style.display='none';}else if(shape==='tri'){l1.innerHTML='Base (ft):';l2.innerHTML='Height (ft):';r2.style.display='table-row';}}function calculateResult(){var shape=document.getElementById('shape_type').value;var v1=parseFloat(document.getElementById('input1').value);var v2=parseFloat(document.getElementById('input2').value);var costPerSqft=parseFloat(document.getElementById('input3').value);var showSteps=document.getElementById('steps').checked;var area=0;var stepsText=";if(isNaN(v1)){alert('Please enter the primary dimension');return;}if(shape==='rect'){if(isNaN(v2)){alert('Please enter the width');return;}area=v1*v2;stepsText='Formula: Length ('+v1+') x Width ('+v2+') = '+area+' sq ft';}else if(shape==='circle'){var radius=v1/2;area=Math.PI*Math.pow(radius,2);stepsText='Formula: \u03C0 x (Diameter/2)\u00B2 -> 3.14159 x ('+radius+')\u00B2 = '+area.toFixed(2)+' sq ft';}else if(shape==='tri'){if(isNaN(v2)){alert('Please enter the height');return;}area=0.5*v1*v2;stepsText='Formula: 0.5 x Base ('+v1+') x Height ('+v2+') = '+area+' sq ft';}document.getElementById('areaResult').innerHTML=area.toLocaleString(undefined,{minimumFractionDigits:2,maximumFractionDigits:2});if(!isNaN(costPerSqft)&&costPerSqft>0){var totalCost=area*costPerSqft;document.getElementById('costResult').innerHTML='$'+totalCost.toLocaleString(undefined,{minimumFractionDigits:2,maximumFractionDigits:2});document.getElementById('costSection').style.display='block';if(showSteps)stepsText+='
Cost: '+area.toFixed(2)+' sq ft x $'+costPerSqft+' = $'+totalCost.toFixed(2);}else{document.getElementById('costSection').style.display='none';}if(showSteps){document.getElementById('stepDetails').innerHTML='Calculation Steps:
'+stepsText;document.getElementById('stepDetails').style.display='block';}else{document.getElementById('stepDetails').style.display='none';}document.getElementById('answer').style.display='block';}

How to Use the SQFT Calculator

Whether you are measuring a room for new hardwood floors, planning a garden, or calculating the size of a commercial property, our sqft calculator makes the process fast and accurate. This tool is designed to handle multiple shapes and even provide cost estimates based on your area measurements.

To get started, simply select the shape of the area you are measuring from the dropdown menu and enter the required dimensions in feet. If you are calculating project costs, you can also enter the price per square foot to see a total estimate.

Choose Area Shape
Select between Rectangle/Square, Circle, or Triangle to match the footprint of your project.
Dimensions (ft)
Enter your measurements in feet. If you have inches, divide them by 12 first (e.g., 6 inches is 0.5 feet).
Cost per Sq Ft
An optional field to help you budget for materials like carpet, tile, or sod.

How It Works: The Formulas

The sqft calculator uses standard geometric formulas to derive the area based on your inputs. Area is always measured in "square" units because it represents a two-dimensional space.

Rectangle Area = Length × Width
Circle Area = π × (Diameter / 2)²
Triangle Area = 0.5 × Base × Height

  • Length/Width: These are the two perpendicular sides of a room or lot.
  • Diameter: The total distance across a circle through the center.
  • Base/Height: For triangles, the base is the bottom edge, and the height is the vertical distance from the base to the top peak.

Square Footage Calculation Examples

Example 1: Rectangular Bedroom

Imagine you have a bedroom that is 12 feet long and 15 feet wide. You want to buy laminate flooring that costs $4.50 per square foot.

  1. Length = 12 ft, Width = 15 ft
  2. Calculate: 12 × 15 = 180 sq ft
  3. Cost Calculation: 180 × $4.50 = $810.00
  4. Total Result: 180 sq ft at a cost of $810.00

Example 2: Circular Patio

You are building a circular fire pit area with a diameter of 20 feet.

  1. Diameter = 20 ft (Radius = 10 ft)
  2. Calculate: π × 10² = 3.14159 × 100
  3. Total Result: 314.16 sq ft

Common Questions

How do I calculate sqft if my room isn't a perfect rectangle?

For L-shaped rooms or irregular spaces, the best method is to "break" the room into smaller rectangles. Calculate the square footage of each rectangle separately using the sqft calculator and then add the totals together.

How many square feet is a 12×12 room?

A 12×12 room is exactly 144 square feet. This is a common size for medium bedrooms or large home offices.

What if my measurements are in inches?

Before using the sqft calculator, convert your inches to feet by dividing by 12. For example, if a wall is 10 feet and 6 inches, enter 10.5 feet into the calculator.

Should I buy extra material for flooring?

Yes. Most professionals recommend adding 10% to your total square footage to account for waste, cuts, and mistakes during installation. If your result is 500 sq ft, you should purchase roughly 550 sq ft of material.

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