Numerical Integration Calculator

Approximate definite integrals ∫ f(x) dx using Simpson, Trapezoid, or Riemann sums.

Result:

How to Use:

• Enter your function in terms of x. Example: x^3 + 2*x - 5.
• You can use ^ for powers and ln(x) for natural logarithm.
• Select the number of subintervals n. Higher values improve accuracy.
• Choose a method: Trapezoid, Simpson (requires even n), Left/Right/Midpoint Riemann sums.