Cuboid calculator is an online tool to calculate area of cuboid, volume, perimeter and rectangular length of the diagonal. Enter the length, width and height to calculate surface area.

A rectangular solid bounded by six rectangular plane faces is called a cuboid. Cuboid – 6 flat faces of which 4 are long (rectangular) and 2 are smaller (square), 12 straight edges of which 4 are longer and 8 are shorter, 8 corners (vertices).

A match box, a brick, a book, etc., are all examples of a cuboid.

The following are some definitions of terms related to a cuboid:

(i) The space enclosed by a cuboid is called its volume.

(ii) The line joining opposite corners of a cuboid is called its diagonal.

A cuboid has four body diagonals.

A diagonal of a cuboid is the length of the longest rod that can be placed in the cuboid.

(iii) The sum of areas of all the six faces of a cuboid is known as its total surface area.

(iv) The four faces which meet the base of a cuboid are called the lateral faces of the cuboid.

(v) The sum of areas of the four walls of a cuboid is called its lateral surface area.

For a cuboid of length = l units, breadth = b units and height = h units, we have:

Sum of lengths of all edge = 4 (l + b + h) units.

Diagonal of cuboid = Sqrt(l^{2} + b^{2} + h^{2})

Total Surface Area of cuboid = 2(lb + bh + lh) sq. units

Lateral Surface Area of a cuboid = Area of four walls of a room = [2h(l + b)]] sq. units

Volume of cuboid = (l × b × h) cubic units

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