Use this Rectangle Area Calculator to find the area of a rectangle by entering its length and width. You can choose different measurement units and instantly calculate the area, perimeter, and diagonal.
Rectangle Measurements
Calculation Result
How to Calculate the Area of a Rectangle
The area of a rectangle tells you how much flat space it covers. To calculate it, multiply the length by the width. Make sure both measurements are converted to the same unit before multiplying.
Example: Suppose a rectangle is 10 cm long and 5 cm wide.
- Length = 10 cm
- Width = 5 cm
- Area = 10 × 5 = 50 cm²
The area of the rectangle is 50 square centimeters.
What Is the Area of a Rectangle?
The area of a rectangle is the amount of space inside its boundaries. To find it, multiply the length by the width. Both measurements should be in the same unit before calculating the area.
Formula: Area = Length x Width (a = l x b)
Example: Find the Area of a Rectangle
Suppose a rectangle has a length of 10 cm and a width of 5 cm.
- Length = 10 cm
- Width = 5 cm
Calculation: Area = 10 × 5 = 50 cm²
The area is 50 square centimeters.
You can also calculate the perimeter using:
Perimeter = 2 × (Length + Width)
For the same rectangle:
Perimeter = 2 × (10 + 5) = 30 cm
How to Find the Width of a Rectangle
If you know the area and length, you can find the width by dividing the area by the length.
Formula:
Width = Area ÷ Length
Example:
If the area is 40 cm² and the length is 10 cm:
Width = 40 ÷ 10 = 4 cm
This format should display correctly in a normal WordPress paragraph or Custom HTML block without requiring a math plugin.
Frequently Asked Questions
1. How do you calculate the area of a rectangle?
Multiply its length by its width. For example, a rectangle measuring 8 m by 4 m has an area of 32 m².
2. What is the formula for the area of a rectangle?
The formula is Area = Length × Width. The result is expressed in square units, such as cm², m², or ft².
3. Can I calculate the area using different units?
Yes. You can enter the length and width in different units. The calculator converts the measurements automatically and displays the result according to the selected length unit.
4. What is the difference between area and perimeter?
Area measures the space inside a rectangle, while perimeter measures the total distance around its edges.
5. Can I use this calculator for a square?
Yes. A square is a special type of rectangle with equal length and width. Enter the same measurement for both sides to calculate its area.