Square Feet Calculator

by
Square Feet Calculator
Rectangle / SquareCircleTriangle
ftinydm
ftinydm
Answer:
Enter values to calculate
function toggleInputs(){var type=document.getElementById('calc_type').value;var row2=document.getElementById('row2');var lbl1=document.getElementById('label1');var lbl2=document.getElementById('label2′);if(type==='circle'){row2.style.display='none';lbl1.innerHTML='Radius:';}else if(type==='triangle'){row2.style.display='table-row';lbl1.innerHTML='Base:';lbl2.innerHTML='Height:';}else{row2.style.display='table-row';lbl1.innerHTML='Length:';lbl2.innerHTML='Width:';}}function calculateResult(){var type=document.getElementById('calc_type').value;var v1=parseFloat(document.getElementById('input1').value);var u1=parseFloat(document.getElementById('unit1').value);var v2=parseFloat(document.getElementById('input2').value);var u2=parseFloat(document.getElementById('unit2').value);var price=parseFloat(document.getElementById('price').value)||0;var showSteps=document.getElementById('steps').checked;if(isNaN(v1)||(type!=='circle'&&isNaN(v2))){alert('Please enter valid numerical values');return;}var area=0;var stepsHtml=";var lFeet=v1*u1;var wFeet=v2*u2;if(type==='rectangle'){area=lFeet*wFeet;stepsHtml='Area = Length × Width
Area = '+lFeet.toFixed(2)+' ft × '+wFeet.toFixed(2)+' ft = '+area.toFixed(2)+' sq ft';}else if(type==='circle'){area=Math.PI*Math.pow(lFeet,2);stepsHtml='Area = π × r²
Area = 3.14159 × ('+lFeet.toFixed(2)+' ft)² = '+area.toFixed(2)+' sq ft';}else if(type==='triangle'){area=0.5*lFeet*wFeet;stepsHtml='Area = 0.5 × Base × Height
Area = 0.5 × '+lFeet.toFixed(2)+' ft × '+wFeet.toFixed(2)+' ft = '+area.toFixed(2)+' sq ft';}var totalText=''+area.toLocaleString(undefined,{maximumFractionDigits:2})+' Square Feet';if(price>0){var totalCost=area*price;totalText+='
Total Cost: $'+totalCost.toLocaleString(undefined,{minimumFractionDigits:2,maximumFractionDigits:2})+'';stepsHtml+='
Cost = '+area.toFixed(2)+' sq ft × $'+price.toFixed(2)+'/sq ft = $'+totalCost.toFixed(2);}document.getElementById('resultValue').innerHTML=totalText;if(showSteps){document.getElementById('stepDetails').innerHTML=stepsHtml;document.getElementById('stepDetails').style.display='block';}else{document.getElementById('stepDetails').style.display='none';}}

Calculator Use

This square feet calculator is a versatile tool designed to help you measure the area of various surfaces. Whether you are planning a flooring project, calculating yard space for landscaping, or determining the size of a room for furniture, this tool provides instant results in square footage. By entering the dimensions of your space and choosing the appropriate shape, you can quickly find the total area and even estimate costs based on price per square foot.

Length / Base / Radius
The primary horizontal or vertical measurement of your shape. You can enter this in feet, inches, yards, or meters.
Width / Height
The secondary dimension for rectangles and triangles. For circles, this input is hidden as only the radius is required.
Price per Sq Ft
An optional field to calculate the total material or labor cost based on the calculated square footage.

How It Works

The square feet calculator uses standard geometric formulas to derive the area. The first step involves converting all input units into feet to ensure the final result is consistently in square feet. The formulas used are:

Rectangle/Square: Area = Length × Width

Circle: Area = π × Radius²

Triangle: Area = 0.5 × Base × Height

  • Length/Width: Dimensions must be in the same unit or converted to feet (12 inches = 1 foot).
  • π (Pi): Approximately 3.14159, used for calculating circular areas.
  • Costing: Multiplies the final square footage by your provided unit price.

Calculation Example

Example: Imagine you have a rectangular bedroom that is 12 feet long and 10 feet wide. You want to install new carpet that costs $3.50 per square foot.

Step-by-step solution:

  1. Identify shape: Rectangle
  2. Length = 12 ft, Width = 10 ft
  3. Calculate Area: 12 × 10 = 120 sq ft
  4. Calculate Cost: 120 sq ft × $3.50 = $420.00
  5. The final result is 120 square feet with a total cost of $420.00.

Common Questions

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

To calculate an irregular or L-shaped room, divide the space into smaller, regular rectangles. Calculate the square footage for each rectangle separately using the square feet calculator, and then add the results together for the total area.

What if my measurements are in inches?

Our calculator allows you to select "in" (inches) from the dropdown menu next to the input fields. It will automatically convert the inches to feet (by dividing by 12) before performing the area calculation.

How much extra flooring should I buy?

It is standard industry practice to add 10% to your total square footage calculation to account for waste, cuts, and mistakes during installation. For a 100 sq ft room, you should order 110 sq ft of material.

Leave a Comment