Smart Rectangle Calculator Smart Rectangle Calculator Smart Rectangle Calculator Select an option from the list below Choose an Option: — Select an Option — 1. Length and Width with percentage increase/decrease (Area Calculation) 2. Length and Width given (Perimeter, Area, and Diagonal Calculation) 3. One side and Diagonal given (Area and Perimeter Calculation) 4. Perimeter and Area given (Length and Width Difference Calculation) Length of one side of the rectangle (before % increase): Length of other side of the rectangle (before % decrease): Percentage Increase for Side 1: Percentage Decrease for Side 2: Length of the rectangle: Width of the rectangle: One side of the rectangle: Diagonal of the rectangle: Perimeter of the rectangle: Area of the rectangle: Calculate smart Calculator