• Area of a Rectangle Calculator
    Calculate the area of a rectangle instantly with A = length × width. Also returns perimeter and diagonal for any unit you enter.
  • Rectangle Area and Perimeter Calculator
    Calculate the area and perimeter of a rectangle from its width and height. Enter both sides in the same length unit to get area in unit squared and perimeter.
  • Rectangle Calculator
    Free rectangle calculator: enter length and width to instantly find the area, perimeter, and diagonal of any rectangle with clear formulas.