What It Does
This calculator finds the floor area of a rectangular room from its length and width, and converts the result between square feet and square meters. It is useful for flooring, paint, tiling, and real-estate estimates anywhere in the world.
How to Use It
Enter the length and width of the room, then choose whether your measurements are in feet or meters. The calculator multiplies the two dimensions to get the area, then shows the equivalent value in both square feet and square meters.
The Formula Explained
Area of a rectangle is simply \(A = \text{length} \times \text{width}\). To convert units we use \(1\ \text{ft}^2 = 0.09290304\ \text{m}^2\), and \(1\ \text{m}^2 \approx 10.7639\ \text{ft}^2\). If you measure in meters, the area is computed in square meters first, then scaled up to square feet.
$$\begin{aligned} \text{Area}_{ft^2} &= \text{Length (ft)} \times \text{Width (ft)} \\[0.6em] \text{Area}_{m^2} &= \text{Area}_{ft^2} \times 0.09290304 \end{aligned}$$
Worked Example
A room measured at 12 ft by 10 ft has an area of \(12 \times 10 = 120\) square feet. Converting:
$$120 \times 0.09290304 \approx 11.15 \text{ square meters}$$A room of 4 m by 5 m is 20 square meters, which is
$$20 \times 10.7639 \approx 215.28 \text{ square feet}$$
FAQ
Does this work for non-rectangular rooms? No — for L-shaped or irregular rooms, split them into rectangles, calculate each, and add the areas.
How many square feet in a square meter? About 10.7639 square feet.
Can I mix feet and meters? No, both length and width must use the same unit selected in the dropdown.
