Perimeter of a Rectangle Calculator
Use this calculator to find the perimeter of a rectangle when you know its width and length.
Perimeter tells you the total distance around the rectangle (in units).
In the diagram, the width is w and the length is l.
Step-by-step method
- Identify what is given.
- Write the formula.
- Substitute the values and calculate the perimeter.
Formula:
Example 1: w = 4, l = 6
Step 1 - Identify what is given.
In this problem: The given dimensions are w = 4 and l = 6.
Step 2 - Write the formula.
In this problem: Use the rectangle perimeter formula: P = 2(l + w).
Step 3 - Substitute the values and calculate the perimeter.
In this problem: Substitute l = 6 and w = 4: P = 2(6 + 4) = 2(10) = 20.
Final answer: P = 20
Example 2: w = 3.5, l = 2
Step 1 - Identify what is given.
In this problem: The given dimensions are w = 3.5 and l = 2.
Step 2 - Write the formula.
In this problem: Use the rectangle perimeter formula: P = 2(l + w).
Step 3 - Substitute the values and calculate the perimeter.
In this problem: Substitute l = 2 and w = 3.5: P = 2(2 + 3.5) = 2(5.5) = 11.
Final answer: P = 11
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