Rectangle Area Calculator
A rectangle area calculator finds the amount of space inside a rectangle when its length and width are known. It is useful for geometry, construction, flooring, landscaping, room measurements, and everyday area calculations.
What Is the Area of a Rectangle?
The area of a rectangle is the space enclosed by its four sides. Because a rectangle has opposite sides of equal length, its area can be found by multiplying the length by the width.
Rectangle Area Formula
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A = l Γ w
Here, A is the area, l is the length, and w is the width.
How to Calculate Rectangle Area
Suppose a rectangle has a length of 12 meters and a width of 5 meters.
A = 12 Γ 5
A = 60 m2
Therefore, the area of the rectangle is 60 square meters.
Using Different Units
The length and width should be expressed in the same unit before multiplying. If one measurement is in meters and the other is in centimeters, convert one of them first.
For example, if a rectangle is 2 meters long and 50 centimeters wide, convert 50 centimeters to 0.5 meters:
A = 2 Γ 0.5 = 1 m2
Common Rectangle Areas
| Length | Width | Area |
|---|---|---|
| 5 units | 2 units | 10 square units |
| 8 units | 3 units | 24 square units |
| 10 units | 4 units | 40 square units |
| 12 units | 5 units | 60 square units |
| 20 units | 10 units | 200 square units |
Area vs. Perimeter
Area and perimeter measure different properties of a rectangle. Area measures the space inside the rectangle, while perimeter measures the total distance around its outside edges.
The perimeter formula is:
P = 2(l + w)
Make sure you use the area formula when you need square units and the perimeter formula when you need a length measurement.
Where Is Rectangle Area Used?
Rectangle area is useful for calculating the size of floors, walls, gardens, plots, tabletops, rooms, sheets of material, and other rectangular surfaces. It can also be used to estimate how much material is needed to cover a rectangular space.
Common Mistakes to Avoid
Make sure you multiply the length by the width rather than adding them. Also check that both measurements use compatible units before calculating.
Area is expressed in square units, such as cm2, m2, ft2, or in2. Do not report a rectangle's area in ordinary or cubic units.
Quick Summary
The area of a rectangle is found by multiplying its length by its width: A = l Γ w. Use the same unit for both dimensions, and express the final result in square units.