Rectangle Calculator
Calculate area, perimeter, and diagonal of a rectangle. Convert between square inches, square feet, square meters, and more.
Rectangle Dimensions
Rectangle properties
Area: Length × Width
Perimeter: 2 × (Length + Width)
Diagonal: √(Length² + Width²)
1 sq in = 6.4516 cm² = 0.00694 sq ft
Calculation Options
Rectangle formulas
Area = L × W
Perimeter = 2L + 2W
Diagonal = √(L² + W²)
Rectangle Calculation Results
Area in Square Inches
Area Unit Comparison
| Unit | Abbreviation | Square Inches | Equivalent Area | Common Use |
|---|
Rectangle Formulas
Area
Formula: Area = Length × Width
Example: L = 10 in, W = 8 in → Area = 80 in²
Perimeter
Formula: Perimeter = 2 × (Length + Width)
Example: L = 10 in, W = 8 in → P = 2 × 18 = 36 in
Diagonal
Formula: d = √(Length² + Width²)
Example: L = 10 in, W = 8 in → d = √(100+64) = √164 ≈ 12.81 in
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