Simpson’s Rule Approximation Calculator

Simpson’s Rule Approximation Calculator

Are you looking for a quick and easy way to approximate definite integrals? Simpson’s Rule is a numerical method that can help you calculate the area under a curve with just a few simple steps. This tool allows you to input the function you want to integrate, the interval of integration, and the number of subintervals to use for the approximation. Within seconds, you can obtain an accurate estimation of the definite integral using Simpson’s Rule.

What is Simpson’s Rule?


Simpson’s Rule is a method for approximating definite integrals by dividing the interval of integration into subintervals and taking weighted averages of the function values at the endpoints and midpoint of each subinterval. By using quadratic polynomials to approximate the curve, Simpson’s Rule provides a more accurate estimation of the integral compared to simpler methods like the Trapezoidal Rule.

How to Use the Simpson’s Rule Approximation Calculator

Using the Simpson’s Rule Approximation Calculator is easy. Simply enter the following information:

  1. The function you want to integrate
  2. The lower and upper limits of integration
  3. The number of subintervals to divide the interval into

Once you have inputted this information, click the “Calculate” button to obtain the approximate value of the definite integral. You can adjust the number of subintervals to see how the approximation changes as you increase or decrease the level of granularity in the calculation.

Example Calculation using Simpson’s Rule

Let’s walk through an example to demonstrate how Simpson’s Rule works. Suppose we want to approximate the definite integral of the function f(x) = x^2 between x = 0 and x = 2 using 4 subintervals. By inputting these values into the calculator, we find that the approximate value of the integral is 2.6667.

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As we increase the number of subintervals to 8, the approximation becomes more accurate, yielding a value of 2.6667. With further refinements in the number of subintervals, we can continue to improve the accuracy of our estimation of the definite integral.

Benefits of Using Simpson’s Rule

There are several advantages to using Simpson’s Rule for numerical integration:

  • Higher accuracy compared to the Trapezoidal Rule
  • Efficient computation with relatively few function evaluations
  • Ability to handle oscillatory functions and complex curves with greater precision

Whether you are a student studying calculus or a professional mathematician, Simpson’s Rule provides a versatile and reliable method for approximating definite integrals in a wide range of applications.


In conclusion, the Simpson’s Rule Approximation Calculator is a valuable tool for quickly estimating definite integrals with high accuracy. By following a simple step-by-step process, you can input the necessary information and obtain an approximation of the integral within seconds. Whether you are exploring mathematical concepts or solving real-world problems, Simpson’s Rule is a powerful numerical method that can streamline your calculations and enhance your understanding of numerical integration techniques.