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

Rectangle area calculation method

Side a: Side b:

Side a (or b): Perimeter P:

Side a (or b): Diagonal d:

Diagonal d: Angle α°:

Side a (or b): Radius R:

Side a (or b): Diameter D:

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.

Solution:

To find the area of a rectangle, it is enough to perform a few simple actions:

Choose the way to find the area. The choice of method depends on the data you have.
Enter the rectangle data in the appropriate field.
Click the "Calculate" button and the result with a step-by-step solution will appear on the screen.

A rectangle is a parallelogram, in which all angles are straight (equal to 90 degrees)
Rectangle properties.
1) The opposite sides of the rectangle are equal and parallel.
2) The sides of the rectangle are its heights.
3) The diagonals of the rectangle are equal, intersect, and the intersection point is divided in half.

Download all formulas for finding the area of a rectangle in Word format

Last 20 calculations on this calculator

Area of rectangle with perimeter 2 and side 1 equal to 0
The area of a rectangle with the radius of a circumscribed circle 76 and side 99 equal to NAN
The area of a rectangle with the radius of a circumscribed circle 76 and side 99 equal to 11418.561
Area of a rectangle with a diagonal 99 and the angle between them 76° equal to 4753.485
Area of rectangle with perimeter 76 and side 99 equal to -6039
Area of a rectangle with a diagonal 76 and side 99 equal to NAN
Area of a rectangle with a diagonal 123456 and side 1230 equal to 151843343.79
Area of a rectangle with a diagonal 123456 and side 4 equal to 493824
Area of rectangle with perimeter 25 and side 5 equal to 37.5
Area of rectangle with perimeter 5 and side 5 equal to -12.5
Area of rectangle with perimeter 5 and side 4 equal to -6

Let us know about the problem that has arisen as a result of the calculation on this calculator.

After the calculation, click on the button 'The calculation is not correct' if you find an error. Or click 'calculation is correct' if there are no errors.