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Rectangle Area Calculator
Calculate area, perimeter, and diagonal of a rectangle
š Examples, Rules & Help
šHow to Calculate Rectangle Area
Enter Dimensions
Input the length and width of your rectangle in any consistent unit (inches, cm, meters, etc.).
Apply Rectangle Formulas
The calculator uses Area = l Ć w, Perimeter = 2(l + w), and Diagonal = ā(lĀ² + wĀ²).
Calculate Properties
Get area, perimeter, and diagonal length with step-by-step calculations.
View Results
All calculations are shown with detailed explanations and proper units.
šÆCommon Use Cases
Construction & Design
- Floor area calculations for flooring materials
- Wall area calculations for paint coverage
- Window and door frame measurements
- Garden plot and landscaping area planning
Manufacturing & Packaging
- Box and packaging design calculations
- Sheet material cutting optimization
- Screen and display size calculations
- Fabric and textile area measurements
š”Calculator Tips & Best Practices
š”Square vs Rectangle
A square is a special rectangle where length equals width. Use this calculator for both shapes.
šUnit Consistency
Always use the same unit for both length and width to get meaningful results.
āDiagonal Applications
Diagonal length is useful for determining if rectangles fit through openings or for bracing calculations.