Triple Integral Calculator

Category: Calculus
- August 26, 2025
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Calculate and visualise triple integrals over various regions in 3D space. This calculator helps with setting up the integration bounds, visualising the region, and computing the result.

Integral Setup

Use x, y, z for Cartesian; r, theta, z for Cylindrical; rho, theta, phi for Spherical
Integration Bounds (Cartesian)
x:
to
y:
to
z:
to
Current Region:
Upper hemisphere with radius 1, centred at origin
Options
Preset Regions

Understanding Triple Integrals

A triple integral represents the volume integral of a function over a region in three-dimensional space. It extends the concept of single and double integrals to three dimensions.

Definition

The triple integral of a function f(x,y,z) over a region V in three-dimensional space is defined as:

∭V f(x,y,z) dV

This represents the sum of the values of f throughout the region V, weighted by the volume element dV.

Different Coordinate Systems

Triple integrals can be evaluated in different coordinate systems:

Cartesian: ∭ f(x,y,z) dx dy dz

Cylindrical: ∭ f(r,θ,z) r dr dθ dz

Spherical: ∭ f(ρ,θ,φ) ρ² sin(φ) dρ dθ dφ

The choice of coordinate system should match the symmetry of the problem to simplify calculations.

Applications

Triple integrals have many practical applications, including:

  • Calculating volumes of complex 3D shapes
  • Finding the centre of mass of a solid object
  • Computing moments of inertia in physics
  • Determining the total electric or gravitational potential in a region
  • Solving problems in fluid dynamics and electromagnetism

Disclaimer: This calculator provides approximations for educational purposes. For critical applications requiring high precision, verify results with specialised mathematical software or consult with a professional mathematician.

What Is a Triple Integral Calculator?

The Triple Integral Calculator is a user-friendly online tool that helps you evaluate and understand triple integrals — a method of calculating the volume under a surface in three-dimensional space. Whether you're working with Cartesian, Cylindrical, or Spherical coordinates, this calculator allows you to define the integrand function, input integration bounds, and receive both symbolic and numerical solutions, complete with optional step-by-step guidance and 3D visualisations.

∭V f(x, y, z) dV = ∫∫∫ f(x, y, z) dz dy dx

Why Use This Tool?

This calculator is helpful for students, educators, and professionals who need to:

  • Find the volume of a region in 3D space
  • Calculate integrals in different coordinate systems
  • Understand how integration bounds relate to geometric shapes
  • Get a step-by-step breakdown of the integration process
  • Visualise 3D regions to build intuition for multivariable Calculus

How to Use the Calculator

  1. Select a coordinate system: Choose between Cartesian (x, y, z), Cylindrical (r, θ, z), or Spherical (ρ, θ, φ) based on the shape of the region.
  2. Enter the integrand function: For example, x^2 + y^2 + z^2 in Cartesian coordinates.
  3. Specify integration bounds: Input the lower and upper limits for each variable. You can also use preset shapes like the unit sphere or cylinder.
  4. Choose options: Toggle whether to show step-by-step solutions, numeric results, or visualisations.
  5. Click "Calculate Integral": View the result, see a breakdown of each integration step, and interact with the 3D visualisation if enabled.

Key Features

  • Supports Cartesian, Cylindrical, and Spherical coordinates
  • Provides symbolic and numeric results
  • Includes preset regions for common shapes
  • Visualises regions in 3D with rotation and zoom
  • Breaks down each step of the integration for learning

Useful for Learning Related Topics

Triple integrals often appear alongside Other multivariable calculus topics. This calculator complements tools such as:

  • Partial Derivative Calculator: Explore how functions change along specific variables using partial derivatives or a multivariable derivative solver.
  • Antiderivative Calculator: Compute indefinite integrals and solve integration problems step by step.
  • Integral Calculator: Solve single-variable definite or indefinite integrals for foundational practice.
  • Directional Derivative Calculator: Understand gradients and how a function changes in specific directions.
  • Tangent Plane Calculator: Find planes that best approximate a surface at a point using differential analysis.

Frequently Asked Questions (FAQ)

What is a triple integral used for?

A triple integral is commonly used to compute volumes, mass, and other quantities over a three-dimensional region. It’s a key concept in Physics, engineering, and multivariable calculus.

Which coordinate system should I choose?

Use the one that matches the symmetry of your region:

  • Cartesian – for cubes, boxes, and rectangular solids
  • Cylindrical – for cylinders and circular shapes
  • Spherical – for spheres, hemispheres, and radial symmetry

Can this calculator show steps?

Yes. You can enable the “Show step-by-step solution” option to see the integral worked out in stages, which is ideal for learning and checking your work.

What if I only want a numeric result?

Enable “Calculate numeric result” to get an approximate decimal value. This is useful when symbolic integration is too complex.

Is this suitable for classroom use?

Absolutely. This calculator is ideal for students and educators to practice problems, verify homework, or use during study sessions.

How This Calculator Helps

Whether you're trying to compute volumes, analyse physical systems, or deepen your understanding of calculus, the Triple Integral Calculator provides clear, actionable insights. It's a practical tool for multivariable calculus that works seamlessly with other concepts like partial derivatives, integration techniques, and vector analysis.