Creators
Rojony Khatun Author
Rojony Khatun
CalculatorToolsProjectExpert
Reviewers
Małgorzata Koperska, MD Steven Wooding
Last updated: November 22, 2025

Rectangular Prism Calculator – Volume & Surface Area

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prism surface area calculator

The Rectangular Prism Calculator assists the user in finding the volume and surface area, and space diagonal of a rectangular prism in a fast manner by keying in length, width, and height. It is ideal to use in geometry, engineering, as well as design to give immediate and precise answers.

Rectangular Prism Calculator

Calculate the volume, surface area, and diagonal of a rectangular prism by entering length, width, and height. Ideal for students, engineers, and designers.

prism surface area calculator

The Rectangular Prism Calculator assists the user in finding the volume and surface area, and space diagonal of a rectangular prism in a fast manner by keying in length, width, and height. It is ideal to use in geometry, engineering, as well as design to give immediate and precise answers.

rectangular solid calculator

The Rectangular Prism Calculator is an online tool that computes the volume, surface area, and space diagonal of a rectangular prism (cuboid) using its length, width, and height. By entering these dimensions, the calculator instantly provides accurate results using standard formulas:

\[ Volume=\iota \times\omega \times h, \textrm{Surface Area}=2(\iota \omega+\iota h+\omega h), Diagonal=\sqrt{\iota^{2} +\omega^{2}} \]

This tool is useful for students, engineers, architects, and designers who need precise rectangular prism measurements for math problems, construction, or design tasks. The interface is simple, responsive, and requires no installation, delivering instant results while reducing manual calculation errors.

Work, Installation, Input to Output

Work:

  • Accepts length, width, and height as input.
  • Calculates volume, surface area, and space diagonal using formulas.
  • Displays results instantly.

Installation:No installation required; works in any modern web browser.

Input:

  • Length(l)
  • Width(w)
  • Height(h)

Output:

  • Volume
  • Surface area
  • Space diagonal

Testing and Final Adjustments

Experiment on length, width, h, and height values, both whole and decimal. Check with the use of formulas. Treat invalid values such as negative numbers or zero. Rounds off in a suitable manner. Mobile and Desktop responsiveness. Give real-time updates whenever there are changes in inputs. Show findings in a unitary manner. You may also add a diagram of the prism to make your users comprehend the measurements.

Frequently Asked Questions - Rectangular Prism Calculator:

What is a Rectangular Prism Calculator?

A tool to calculate the volume, surface area, and space diagonal of a rectangular prism.

How do I use it?

Enter the length, width, and height to get all measurements.

Which formulas are used?

Volume = l×w×h, Surface Area = 2(lw + lh + wh), Diagonal = √(l² + w² + h²).

Is it free?

Yes, the Rectangular Prism Calculator is completely free online.

Can I use it on mobile devices?

Yes, it works on all devices and is fully responsive.

Does it provide instant results?

Yes, calculations are displayed instantly upon input.

Who can use this tool?

Students, engineers, architects, and designers.

Can it handle decimal values?

Yes, it supports decimal and precise inputs.

Does it show a visual rectangular prism?

Optionally, a visual diagram can be displayed based on the dimensions.

Why is it useful?

It saves time, ensures accurate measurements, and aids math, design, and construction tasks.

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Rojony Khatun

Rojony Khatun

Calculator Tools Project

Rojony Khatun is the creator of a free online tools website designed to simplify everyday and engineering-related calculations for students, professionals, and hobbyists. The platform offers a wide variety of basic and advanced calculators across key categories, including Electrical Calculators, Electronic Calculators, and Time & Date Calculators, helping users solve problems quickly and accurately.