Simpson’s Rule Calculator With Table

What is Simpson’s Rule Calculator?

Simpson’s Rule calculator is a tool used in numerical analysis to approximate the integral of a function. It is an easy and efficient method for estimating the area under a curve by using quadratic polynomials. This calculator helps in finding the integral value of a function without having to do the calculations manually.

How Does Simpson’s Rule Work?

Simpson’s Rule is based on approximating the area under a curve by using quadratic polynomials. The rule divides the interval of integration into subintervals and approximates the function on each subinterval by a quadratic polynomial. It then computes the area under the curve by summing up the areas of these quadratic polynomials.


The formula for Simpson’s Rule is:

∫f(x) dx ≈ h/3 * [f(x0) + 4f(x1) + 2f(x2) + 4f(x3) + … + 2f(xn-2) + 4f(xn-1) + f(xn)]

Where h is the width of each subinterval and n is the number of subintervals. The values of f(x0), f(x1), f(x2), etc., are the function values at the endpoints of each subinterval.

Using the Simpson’s Rule Calculator

The Simpson’s Rule calculator simplifies the process of finding the integral value of a function. All you need to do is enter the function, the lower and upper limits of integration, and the number of subintervals. The calculator will then compute the integral value using Simpson’s Rule formula and display the result.

For example, if you want to find the integral of the function f(x) = x^2 between the limits 0 and 1 with 4 subintervals, you would input the function as x^2, lower limit as 0, upper limit as 1, and number of subintervals as 4 in the calculator. The calculator will then output the integral value of the function.

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Benefits of Using Simpson’s Rule Calculator

Using Simpson’s Rule calculator has several benefits:

  • Accuracy: Simpson’s Rule is a more accurate method of numerical integration compared to other methods like the trapezoidal rule.
  • Efficiency: The calculator provides quick and efficient calculations of integral values without the need for manual calculations.
  • Convenience: The calculator is easy to use and saves time in finding the integral value of a function.
  • Versatility: Simpson’s Rule can be applied to a wide range of functions, making it a versatile tool for numerical analysis.

Limitations of Simpson’s Rule Calculator

While Simpson’s Rule is a reliable method for numerical integration, it has its limitations:

  • Order of Accuracy: Simpson’s Rule is a second-order method, meaning it is less accurate for functions with rapidly changing slopes or curves.
  • Complex Functions: Simpson’s Rule may not be suitable for functions that are highly oscillatory or have discontinuities, as it may struggle to accurately approximate the area under the curve.
  • Number of Subintervals: The accuracy of the result obtained from the calculator is dependent on the number of subintervals chosen. Using too few subintervals may lead to inaccuracies in the integral value.


Simpson’s Rule calculator is a valuable tool for numerical analysis applications, allowing for quick and accurate estimation of the integral value of a function. By understanding how Simpson’s Rule works and the benefits and limitations of using it, you can make informed decisions when applying it to your calculations. Whether you are a student learning about numerical methods or a professional working on complex mathematical problems, the Simpson’s Rule calculator can streamline your workflow and improve the accuracy of your results.