Square Footage Calculator
How do you calculate square footage? Simply multiply length by width in feet. This free tool does that math instantly, converts between linear feet and square feet (a linear feet to square feet calculator needs the width — or use our sq ft to linear ft calculator in reverse), and adds up multiple rooms for a total square footage.
Frequently Asked Questions
How do you calculate square footage of a room?
Measure the length and width in feet and multiply them: a room 12 ft by 10 ft is 120 square feet. For L-shaped rooms, split the shape into rectangles, calculate each, and add them together — the Room Adder tab above does exactly that.
How to calculate linear feet?
A linear foot is simply a straight-line measurement: measure the distance in feet along one line. To go from square feet to linear feet, divide the square footage by the width in feet — for example, 120 sq ft of 4-ft-wide flooring is 30 linear feet. Our converter tab handles both directions.
When do I use the linear feet to square feet calculator?
Use it for materials sold by the linear foot — lumber, trim, countertops, fencing — when you know the area you need to cover and the material's width. Square feet = linear feet × width, so a 10-ft board that is 6 inches (0.5 ft) wide covers 5 sq ft.
What is the difference between square feet and linear feet?
Square feet measure area (two dimensions: length × width), while linear feet measure a single straight-line distance. You can only convert between them when you know the width, which is why the converter asks for it.