Tetrahedron volume calculator

Volume of a tetrahedron
The calculator allows you to calculate the volume of a tetrahedron using the lengths of its edges. The formula for calculating the volume is: V = (edge length³) / (6√2). In practical applications, this formula is used to determine the volume of objects shaped as a regular tetrahedron, such as certain types of pyramids or other triangular-based structures.
Edge of Tetrahedron
Radius of Inscribed Sphere
Radius of Circumscribed Sphere
Base Area
"The Tetrahedron, one of the simplest yet unique geometric shapes, plays a key role in the study of spatial geometry and finds wide application in various fields. This figure is a polyhedron consisting of four triangular faces that converge at four vertices and are connected by six edges. Depending on the shape of the faces, tetrahedra can be regular or irregular, with all faces being equilateral triangles in a regular tetrahedron." "Historically, tetrahedra have been used in various cultures and civilizations to symbolize elements and concepts related to space and structure. In mathematics, the tetrahedron serves as an important object for studying stereometry and topology. Its simple yet multifaceted structure deepens the understanding of three-dimensional forms and their properties."

Geometric Description

The tetrahedron is a three-dimensional figure in space, characterized by four triangular faces, four vertices, and six edges. Tetrahedra are divided into different types based on the shape of their faces.

Key elements of a tetrahedron:


Total: 4 faces.

Shape: Each face is a triangle. In a regular tetrahedron, all faces are equilateral triangles.


Total: 6 edges.

Features: In a regular tetrahedron, all edges are equal in length.


Total: 4 vertices.

Features: At each vertex, three faces and three edges converge.

Types of Tetrahedra:

Type Properties
Regular (Equilateral) Tetrahedron

All faces are equilateral triangles.

All edges are equal in length.

Irregular Tetrahedron

Faces can be different types of triangles.

Edges can have different lengths.

Geometric Properties:

  • In a regular tetrahedron, all angles between the edges are equal, and each angle between the faces is approximately 70.53°.
  • The regular tetrahedron has a high degree of symmetry.
  • In a tetrahedron, there are no diagonals in the classical sense, as in polyhedra with more than four faces.

These characteristics define the unique properties of the tetrahedron and influence its use in various practical and theoretical applications.

Mathematical Foundations

Different mathematical formulas are used to calculate the volume of a tetrahedron, depending on the type of tetrahedron and the known parameters.

Volume of a Regular Tetrahedron

For a regular tetrahedron, where all sides are equal, the volume \(V\) is calculated using the formula:

\[ V = \frac{a^3}{6 \sqrt{2}} \]

where \(a\) is the edge length of the tetrahedron.

Through Height and Base Area

If the height \(h\) of the tetrahedron and the base area \(A\) are known, the volume is calculated as:

\[ V = \frac{1}{3} A h \]

Through Edge Lengths

For a tetrahedron with different edge lengths \(a\), \(b\), \(c\), \(d\), \(e\), and \(f\), the volume \(V\) can be calculated using the Cayley-Menger formula:

\[ V = \frac{\sqrt{4a^2b^2c^2 - a^2X - b^2Y - c^2Z + XYZ}}{12} \]

where \(X = (b^2 + c^2 - e^2)\), \(Y = (a^2 + c^2 - f^2)\), \(Z = (a^2 + b^2 - d^2)\).

Through the Radius of the Inscribed Sphere

If the radius of the sphere inscribed in the tetrahedron \(r_{inscribed}\) is known, then the volume \(V\) of a regular tetrahedron can be found using the formula:

\[ V = \frac{4}{3} \pi r_{inscribed}^3 \times \sqrt{2} \]

Through the Radius of the Circumscribed Sphere

For a tetrahedron with a known radius of the sphere circumscribed around it \(r_{circumscribed}\), the volume \(V\) is calculated as follows:

\[ V = \frac{4}{3} \pi r_{circumscribed}^3 \times \sqrt{\frac{2}{3}} \]

Examples of Calculation

  • For a regular tetrahedron with an edge length of 4 m, the volume: \(V = \frac{4^3}{6 \sqrt{2}} \approx 9.24\) cubic meters.
  • With a height of 5 m and a base area of 10 square meters, the volume: \(V = \frac{1}{3} \times 10 \times 5 = 16.67\) cubic meters.

These formulas allow for the precise calculation of the volume of a tetrahedron, which is an important aspect in many fields, including architecture, engineering, and mathematics.

Practical Application

Tetrahedra find practical applications in architecture, engineering, design, and even art in the modern world. They serve as the basis for creating various structures, from simple decorative objects to complex architectural elements.

Architecture and Construction:

  • Tetrahedra are used in architecture to create original and stable structures, such as timber frame houses or playgrounds.
  • In construction, tetrahedral elements can be used to reinforce structures and distribute loads.

Design and Art:

  • Tetrahedra are applied in interior design and sculptures, providing unique geometric shapes.
  • In jewelry art, tetrahedral forms are used to create original ornaments.

Education and Science:

  • Calculating the volume of a tetrahedron is an important part of the geometry curriculum.
  • In scientific research, tetrahedra are used to model molecular structures and other complex systems.

Games and Entertainment:

  • Tetrahedral elements are applied in board and video games, as well as in puzzles.


The tetrahedron, as one of the fundamental geometric figures, plays a significant role in various areas of human activity. From architecture and design to education and scientific research, knowing how to calculate its volume is an important skill. Calculating the volume of a tetrahedron helps to understand complex geometric principles and finds practical application in solving real-world problems. This knowledge contributes to technological development, enhances design and analytical skills, and stimulates a creative approach in various fields of activity.

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