Math
Rectangle Perimeter Calculator
Find the distance around a rectangle from its length and width.
This result is the total distance around all four edges of the rectangle.
Formula
Rectangle perimeter = 2 × (length + width).
How it works
Enter the length and width. The calculator adds the two sides and doubles the total, covering all four edges.
Worked example
For example, a length of 8 and a width of 5 give 2 × (8 + 5) = 26 units.
FAQs
What does the Rectangle Perimeter do?
It takes the values you enter and works out the rectangle perimeter for you, showing the result straight away.
What should I enter?
Enter ordinary numbers in the boxes above. If a value does not make sense for this calculation, the page will ask you to check it instead of showing a wrong answer.
Can I use the result for homework or everyday math?
Yes. It is a general-purpose math helper; for exam or professional work, still check the steps against your own working.
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