Rectangle Area Online Calculator (6 ways)

This online calculator will help you find the area of a rectangle. The solution can be found by six different methods.
Using this calculator, you can get a detailed step-by-step solution with an explanation and output of formulas. Thanks to this, you will be able to understand the algorithm for finding the area of a rectangle. You can also check the calculations that have already been performed.

Calculator
Instruction
Theory
History
Report a problem

A rectangle is a geometric shape that has four right angles (90°) and opposite sides are equal and parallel.
Rectangle area formula Rectangle area formula Through two sides where a and b are sides.

A rectangle is a geometric shape that has four right angles (90°) and opposite sides are equal and parallel.
Rectangle area formula Rectangle area formula Through the perimeter and one of the sides or where a or b - side, P is the perimeter.

A rectangle is a geometric shape that has four right angles (90°) and opposite sides are equal and parallel.
Rectangle area formula Rectangle area formula Diagonally and sideways or where d is diagonal, a or b - side.

A rectangle is a geometric shape that has four right angles (90°) and opposite sides are equal and parallel.
Rectangle area formula Rectangle area formula Along the diagonals and the angle between them where d is diagonal, α° is the angle between them in degrees.

A rectangle is a geometric shape that has four right angles (90°) and opposite sides are equal and parallel.
Rectangle area formula Rectangle area formula Through the side and radius of the circumscribed circle or where R is the radius of the circumscribed circle, a or b - side.

A rectangle is a geometric shape that has four right angles (90°) and opposite sides are equal and parallel.
Rectangle area formula Rectangle area formula Through the side and diameter of the circumscribed circle or where R is the radius of the circumscribed circle, a or b - side.