Definite integral and area calculator Definite integral and area calculator

Definite integral and area calculator

Calculate a definite integral, compare three numerical methods and distinguish signed integral from geometric area. Plot the function and export the calculation.

Numerical integration on a finite interval. The calculation runs in the background on your device. This tool does not find symbolic antiderivatives or evaluate improper integrals.

Use x, pi, e, decimal points, + − * / ^ and parentheses. Examples: sin(x), x^2, sqrt(x), exp(x), ln(x), abs(x). Angles are in radians; write multiplication explicitly.

Use an even number of subdivisions from 10 to 20,000. The report uses twice this number and compares both grids. Reversing the bounds changes the integral’s sign, not the geometric area.

Quick start

Definite integral and area calculator

  1. Enter the data or choose a source file.
  2. Review the options and start processing.
  3. Check the result before downloading or using it.
✓ The tool runs directly in the browser and is ready for quick checks without installing software.
✓ Input can be cleared and recalculated immediately, which is useful for repeated small tasks.
✓ Use fullscreen mode when you need more space for long text, structured data or large result blocks.
✓ Copy buttons are available on generated output so results can be reused in code, documents or support chats.
✓ Most operations are deterministic: the same input and options produce the same output.
✓ For sensitive content, prefer local browser tools and review the result before sharing it further.

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