Creators
Rojony Khatun Author
Rojony Khatun
CalculatorToolsProjectExpert
Reviewers
Małgorzata Koperska, MD Steven Wooding
Last updated: November 25, 2025

Conical Frustum Calculator | Volume & Surface Area

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conicalfrustum-calculator

Conicalfrustum Calculator

Calculate the volume, lateral surface area, and total surface area of a conical frustum by entering the top radius, the bottom radius, and the height

frustum surface area calculator

A Conical Frustum Calculator can also allow the user to find the volume, lateral surface area, and total surface area of a truncated cone by entering the top radius, bottom radius, and height. It can be used in engineering, designing, and learning, and provides accurate measurements in real time.

truncated cone volume solver

The Conical Frustum Calculator is an online tool that computes the volume, lateral surface area, and total surface area of a truncated cone (conical frustum) using the top radius, bottom radius, and height. By entering these dimensions, the calculator provides instant, accurate results using the standard formulas:

\[ Volume = \frac{1}{3} \pi h (r^{2}_{1}+r_{1}r^{2}+r^{2}_{2}) \]

\[ \textrm{Lateral Surface Area }=\pi (r_{1}+r_{2})\iota, \iota=\sqrt{(r_{2}-r_{1})^{2}+h^{2}} \]

\[ \textrm{Total Surface Area}= \textrm{Lateral Area} + \pi(r^{2}_{1}+r^{2}_{2}) \]

This tool is useful for engineers, architects, students, and designers working with truncated cone shapes in construction, manufacturing, or design. The interface is simple, responsive, and requires no installation, delivering fast results while minimizing manual calculation errors.

Work, Installation, Input to Output

Work:

  • Accepts top radius r1 bottom radius r2 and height h as inputs.
  • Calculates slant height \( \iota = \sqrt{(r_{2}-r_{1})^{2}+h^{2}} \)
  • Computes volume, lateral surface area, and total surface area.
  • Displays results instantly.

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

Input:

  • Top radius (r1)
  • Bottom radius bottom radius (r2)
  • Height h

Output:

  • Slant height l
  • Volume
  • Lateral surface area
  • Total surface area

Testing and Final Adjustments

Test the various radii and heights of the top and bottom, including decimals. Manual validation is done using the Ng frustum formula. Negative numbers or zero: How to deal with invalid inputs. Fractions do not round off. Mobile responsiveness and desktop responsiveness. Report immediate changes in inputs. Present results in a form of units. Additionally, as an option, a visual diagram of the truncated cone shape with marked out radii, height, and slant height.

Frequently Asked Questions - Conicalfrustum Calculator:

What is a Conical Frustum Calculator?

A tool to calculate the volume, lateral, and total surface area of a truncated cone.

How do I use it?

Enter the top radius, bottom radius, and height to get the frustum's measurements.

Which formulas are used?

Volume = 1/3 π h (r1² + r1 r2 + r2²), Lateral Area = π (r1 + r2) l, Total Area = Lateral + π(r1² + r2²).

Is it free?

Yes, this 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 frustum?

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

Why is it useful?

It saves time, ensures accurate measurements, and aids design, engineering, and educational 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.