How it works
- length
- one side of the rectangle
- width
- the side next to it
- Area
- the space inside, in square units
Enter both sides in the same unit. If you measure in feet the area is in square feet; a square that is 1 yard on each side is 9 square feet, not 3.
Frequently asked questions
How do you find the area of a rectangle?
Multiply the length by the width. A 4 by 6 rectangle has an area of 24 square units.
What is the area of a 10 by 12 room?
120 square feet, if the sides are measured in feet.
What is the difference between area and perimeter?
Area is the space inside a shape, in square units; perimeter is the distance around its edge, in plain units.
How do I find the area of a square?
A square is a rectangle with equal sides, so multiply the side by itself. See the square page.
What units is area measured in?
Square units, matching your input: square metres, square feet, square inches and so on.
Related conversions
Different shape? Area of a circle uses the radius, area of a triangle uses base and height, and a square needs just one side. There are also pages for a trapezoid, a parallelogram and an ellipse.