Math
Rectangle Area Calculator
Calculate the area and perimeter of a rectangle.
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How this calculation works
Calculate the area and perimeter of a rectangle. Enter your values, select Calculate, then review the result. You can change any value and calculate again.
Formula used
Area = length × width · Perimeter = 2(length + width)
Good to know
Results are estimates for informational purposes.
Example calculation
8 × 5 = 40 · perimeter = 2 × (8 + 5) = 26
How to use this calculator
- Enter your values, select Calculate, then review the result. You can change any value and calculate again.
- Check units and time periods before comparing two results.
- Change one input at a time to understand its effect.
Frequently asked questions
What does the Rectangle Area Calculator calculate?
Calculate the area and perimeter of a rectangle. The result is calculated from the values you enter and the formula shown on this page.
Which assumptions does the Rectangle Area Calculator use?
It applies Area = length × width · Perimeter = 2(length + width). Values, fees, rules or timing not represented by an input are not added automatically.