Mr Calcu | Effortlessly solve definite integrals with clear steps and visual aids that boost your calculus confidence.

Master definite integrals using our powerful Integral Calculator. Visualize and learn with step-by-step solutions that simplify and empower your understanding.

Integral Calculator

Integral Calculator Guidelines

You’ve got this—follow these quick steps to get accurate results fast:

How to Use the Integral Calculator

  • Input format: Use mathematical notation like x^2, e^x, sin(x).
  • Limits: Enter lower and upper bounds using numbers or constants like π or e.
  • Techniques: Optionally select a method or let the calculator decide automatically.
  • Step-by-step output: Review the symbolic antiderivative and numeric result.
  • Graphing: Use visualization to interpret area and convergence.

Integral Calculator Description

What Is Integral Calculus?

Integral calculus is essential in analyzing accumulation, area under curves, and continuous change. Our calculator focuses on definite integrals, solving them step-by-step with optional graphing.

Definition

The definite integral of a function f(x) over an interval [a, b] is defined as:

ab f(x) dx = F(b) - F(a)

Where F(x) is an antiderivative of f(x).

Supported Techniques

  • Substitution (u-sub): Ideal for nested or composite functions.
  • Integration by parts: Based on ∫u dv = uv - ∫v du.
  • Partial fractions: For rational expressions with polynomials.
  • Trigonometric identities: For sine, cosine, and related integrals.
  • Numerical integration: Used when exact antiderivatives don’t exist.

Edge Case Handling

  • Improper Integrals: Computed using limits for infinite bounds or discontinuities.
  • Piecewise Functions: Automatically split at defined intervals and summed individually.
  • Non-elementary Forms: Returns numerical results or uses special functions (e.g., erf).
  • Absolute Value: Automatically split at zero-points of the inner expression.
  • Dirac Delta: Interpreted using distribution rules.

Real-World Applications

Engineering – Charge Accumulation

Given I(t) = 5e^{-0.1t}, find charge transferred in 10 seconds:

Q = ∫010 5e^{-0.1t} dt ≈ 31.6 C

Economics – Consumer Surplus

Evaluate surplus under a linear demand curve:

020 (50 - x) dx = 400

Start solving integrals like a pro—enter your function above and get instant clarity!

Example Calculation

FunctionDefinite Integral (0 to 1)Technique
x^21/3Basic Power Rule
sin(x)1 - cos(1)Standard Trig Integral
e-x²≈ 0.7468Numerical / Error Function
1 / (x² + 1)π/4Inverse Trig Identity
|x - 2|Split at x = 2Piecewise Absolute Value
1 / √x2Improper Integral (a = 0)

Frequently Asked Questions

The Integral Calculator can handle a wide range of functions, including polynomials, trigonometric functions, exponential functions, rational expressions, and even piecewise-defined and improper integrals.

You can specify the lower and upper bounds in the designated input fields using numeric values or constants like π and e.

Yes, the Integral Calculator includes a graphing utility to display the function and the area under the curve between the integration bounds.

Improper integrals—those with infinite bounds or discontinuities—are computed using limit-based definitions. For example: <code>∫<sub>1</sub><sup>∞</sup> 1/x² dx</code> is interpreted as <code>lim<sub>b→∞</sub> ∫<sub>1</sub><sup>b</sup> 1/x² dx</code>.

If an integral lacks a closed-form antiderivative (e.g., <code>e^{-x^2}</code>), the calculator switches to numerical integration and may also represent results using special functions like erf(x).

Yes. The calculator identifies the points where the expression inside the absolute value equals zero, then splits the integral accordingly and evaluates each piece.

Yes. For example, it can evaluate <code>∫<sub>0</sub><sup>a</sup> x dx</code> symbolically to return <code>(1/2)a²</code>.

A definite integral calculates the net area under a curve between two bounds, while an indefinite integral finds the general antiderivative without specific limits.

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