📐 Square Footage Calculator
Calculate the area of a room, lot, or multiple rooms in square feet, square yards, and square meters.
Shape & Measurements
Your Result
How the Square Footage Calculator Works
Square footage measures the area of a space in square feet. It's used for flooring, painting, carpeting, real estate listings, and construction estimates.
Formulas
Circle: Area = π × Radius²
Triangle: Area = ½ × Base × Height
Multiple Rooms: Area = Sum of each room's Length × Width
Unit Conversions
Square Meters = Square Feet ÷ 10.764
Worked Example
For a rectangular room measuring 20 ft by 15 ft, the area is 20 × 15 = 300 square feet. Converting to other units, that's equivalent to about 33.33 square yards or 27.87 square meters.
Frequently Asked Questions
How do I calculate square footage of an irregular room?
Split the room into simple rectangles or triangles, calculate each area separately, then add them together. The "Multiple Rooms" mode above handles this for up to 4 sections.
How many square feet are in a square yard?
One square yard equals 9 square feet, since a yard is 3 feet and area scales by the square of the length (3 × 3 = 9).
Why do real estate listings use square footage?
Square footage gives buyers a standardized way to compare the size of homes and rooms regardless of shape or layout.