Math
Rectangle Perimeter Calculator
Find the distance around a rectangle from its length and width.
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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.
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 maths?
Yes. It is a general-purpose maths helper; for exam or professional work, still check the steps against your own working.