What Is a Square Footage Calculator?
A square footage calculator finds the area of a rectangular space by multiplying its length by its width. Square footage (sq ft or ft²) is the standard measure of floor area used in real estate, construction, flooring, painting, and landscaping projects across many countries that use imperial units. Knowing the exact area helps you buy the right amount of materials and estimate costs accurately.
How to Use It
Measure the length and width of your room or space in feet. Enter both values and the calculator returns the total area in square feet, along with handy conversions to square yards and square meters. For an L-shaped or irregular space, split it into rectangles, calculate each separately, and add the results together.
The Formula Explained
The core formula is simply $$\text{Area} = \text{Length} \times \text{Width}$$ If a room is 12 feet long and 10 feet wide, the area is \(12 \times 10 = 120\) square feet. To convert to square yards, divide by 9 (since one yard equals 3 feet, one square yard equals 9 square feet). To convert to square meters, multiply by \(0.09290304\).
Worked Example
Suppose a living room measures 15 feet by 20 feet. The area is \(15 \times 20 = \) 300 square feet. That equals \(300 \div 9 \approx 33.33\) square yards, or \(300 \times 0.0929 \approx 27.87\) square meters. If carpet costs $4 per square foot, you would budget around $1,200 for the room.
FAQ
How do I measure square footage of an odd-shaped room? Break the space into rectangles, find each area, and sum them. For triangular sections, use \(\frac{1}{2} \times \text{base} \times \text{height}\).
Why convert to square yards? Carpet and some flooring are often sold by the square yard, so the conversion helps with ordering.
Does this include walls or ceilings? No — this calculates floor area only. For painting walls, multiply wall length by ceiling height for each wall.
