Calc

Square Footage Calculator (ft2)

Use this square footage calculator to work out an area of square feet for flooring, landscaping, carpets, tiling and more. This tool also provides a cost of materials estimate. Calculations can be made for rectangular, circular or triangular areas. If you're measuring a room for flooring, take a look at our article on how to measure for a new floor.

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Disclaimer

Whilst every effort has been made in building this square footage calculator, we are not to be held liable for any special, incidental, indirect or consequential damages or monetary losses of any kind arising out of or in connection with the use of the converter tools and information derived from the web site. This square footage calculator is here purely as a service to you, please use it at your own risk. Do not use calculations for anything where loss of life, money, property, etc could result from inaccurate conversions.

Formulae for calculating area

The following are the formulae we use for calculating area:

Formula for area of a rectangle

The formula for calculating the area of a rectangle is: length x width.

Formula for area of a circle

The formula for calculating the area of a circle is: π r2 (with r being the radius of the circle, which is half the diameter). π is the symbol for pi (3.14159265).

Formula for area of a triangle

The formula for calculating the area of a triangle is: base x height / 2.

Calculating square footage - FAQ

Square feet is a unit of area. To calculate square feet for square / rectangular shapes, triangles and circles we do the following:

Calculating square footage for a square or rectangular area

1. Measure the width and length of your area in feet. If your figures are not in feet, use the length converter to convert them.
2. Multiply the two figures together.
3. This gives you your square feet figure (ft2). To work out your cost of materials, simply multiply this figure by your 'cost per square feet'.

Calculating square footage for a circular area

1. Measure the diameter of your circle in feet.
2. To calculate the area of a circle we use the formula: π x (diameter/2)2. That is to say π (pi is 3.14159265) multiplied by half the diameter squared. So, we divide our diameter by 2 and then square it (multiply it by itself) and then multiply by π.
3. This gives you your square feet figure (ft2). To work out your cost of materials, simply multiply this figure by your 'cost per square feet'.

Calculating square footage for a triangular area

1. Measure the length of the base of the triangle and the height of the triangle.
2. To calculate the area of a triangle we use the formula: (base x height) / 2. That is to say we multiply the base by the height and then divide it by 2.
3. This gives you your square feet figure (ft2). To work out your cost of materials, simply multiply this figure by your 'cost per square feet'.