Rectangular Prism Calculator (Cuboid)

  • Enter the length (L), width (W), and height (H) of the cuboid in the respective input fields.
  • Select the desired units from the "Select Units" dropdown menu.
  • Click the "Calculate" button to calculate the volume, surface area, and diagonal length of the cuboid.
  • The results will be displayed below, and you can copy them to the clipboard using the "Copy Results" button.
  • Your calculation history will be shown in the "Calculation History" section.
  • You can clear the results and start over using the "Clear Results" button.
Volume: - -
Surface Area: - -
Diagonal Length: - -
Calculation History:


    The Rectangular Prism Calculator, referred to as the Cuboid Calculator, is a valuable tool used in mathematics and engineering to calculate various parameters related to rectangular prisms, commonly known as cuboids. This versatile calculator helps users determine essential properties of cuboids, including volume, surface area, diagonal length, and more.

    The Concept of Rectangular Prisms (Cuboids)

    A rectangular prism, also known as a cuboid, is a three-dimensional geometric shape with six rectangular faces. Each of these faces is a parallelogram, and opposite faces are congruent and parallel to each other. The key features of a rectangular prism include:

    • Length (L): The measurement along the longest dimension of the cuboid.
    • Width (W): The measurement along the second longest dimension, perpendicular to the length.
    • Height (H): The measurement along the shortest dimension, perpendicular to both length and width.
    • Volume (V): The amount of space enclosed by the cuboid.
    • Surface Area (SA): The total area of all six faces of the cuboid.
    • Diagonal Length (D): The length of the diagonal connecting two opposite corners of the cuboid.

    Formulas for Rectangular Prism Calculations

    Volume (V)

    The formula for calculating the volume of a rectangular prism is:

    Volume (V) = Length (L) × Width (W) × Height (H)

    Surface Area (SA)

    To find the total surface area of a cuboid, you can use this formula:

    Surface Area (SA) = 2(LW + LH + WH)

    Diagonal Length (D)

    The diagonal length of a rectangular prism can be determined using the Pythagorean theorem. The formula is:

    Diagonal Length (D) = √(L² + W² + H²)

    Example Calculations

    Let’s explore some practical examples of using the Rectangular Prism Calculator:

    Example 1: Calculate Volume

    Suppose you have a rectangular prism with the following dimensions:

    • Length (L) = 5 units
    • Width (W) = 3 units
    • Height (H) = 2 units

    Using the volume formula, we can find the volume (V):

    V = 5 × 3 × 2 = 30 cubic units

    Example 2: Determine Surface Area

    Consider a cuboid with these measurements:

    • Length (L) = 8 cm
    • Width (W) = 6 cm
    • Height (H) = 4 cm

    To calculate the surface area (SA), use the surface area formula:

    SA = 2(8 × 6 + 8 × 4 + 6 × 4) = 176 square cm

    Example 3: Find Diagonal Length

    Suppose you have a rectangular prism with dimensions:

    • Length (L) = 10 meters
    • Width (W) = 7 meters
    • Height (H) = 3 meters

    To find the diagonal length (D), apply the diagonal length formula:

    D = √(10² + 7² + 3²) ≈ 12.17 meters

    Real-World Use Cases

    The Rectangular Prism Calculator (Cuboid) finds applications in various fields:

    Architecture and Construction

    Architects and builders use this tool to calculate the volume of materials required for construction projects, such as concrete for foundations or the amount of lumber for framing.

    Packaging and Shipping

    Companies use cuboid calculations to determine the size and volume of packaging required for shipping products efficiently.

    Engineering and Manufacturing

    Engineers rely on cuboid calculations for designing components, storage solutions, and machinery.

    Geometry Education

    Teachers and students use this calculator to illustrate geometric concepts and solve problems related to rectangular prisms in the classroom.

    Interior Design

    Interior designers use cuboid calculations to plan and visualize room layouts, including furniture placement and storage.


    The Rectangular Prism Calculator, also known as the Cuboid Calculator, is a valuable tool that simplifies mathematical calculations related to rectangular prisms. By providing formulas for volume, surface area, and diagonal length, this tool serves a wide range of applications in fields such as architecture, construction, engineering, education, and design.

    Avatar of Nidhi


    Hi! I'm Nidhi.

    Here at the EHL, it's all about delicious, easy recipes for casual entertaining. So come and join me at the beach, relax and enjoy the food.


    1. I found the example calculations to be very helpful in understanding how to apply the formulas to real-life scenarios. It’s a practical guide for using the Cuboid Calculator.

    2. The formulas for volume, surface area, and diagonal length are clearly explained. This calculator is a must-have for anyone dealing with rectangular prisms.

    3. The Cuboid Calculator simplifies complex mathematical calculations into easy-to-use formulas. A great resource for professionals and students alike.

    4. This article provides a comprehensive overview of the Rectangular Prism Calculator and its applications. It’s a valuable resource for anyone working with cuboids in various fields.

    5. I appreciate the real-world examples provided in this article. It really helps to see how these calculations are used in different industries.

    6. The detailed explanations and examples make it easy to understand how to use the Cuboid Calculator for practical applications. Great work!

    7. The article effectively highlights the significance of the Cuboid Calculator in various fields. It presents a compelling case for its practical applications.

    8. The Cuboid Calculator is a game-changer for interior designers and packaging experts. It streamlines the process of planning and visualizing spatial layouts.

    9. The real-world use cases demonstrate the versatility of the Cuboid Calculator in different industries. It’s certainly an indispensable tool for professionals.

    10. The applications of the Cuboid Calculator in architecture, construction, engineering, and education are well-highlighted. It’s definitely an essential tool for professionals in these fields.

    Leave a Reply

    Your email address will not be published. Required fields are marked *