Function Differential Calculator

Find function differential step by step

For the given function $$$y=f(x)$$$, point $$$x_0$$$ and argument change $$$\Delta x_0$$$, the calculator will find the differential $$$dy$$$ and the function change $$$\Delta y$$$, with steps shown.

If the calculator did not compute something or you have identified an error, or you have a suggestion/feedback, please write it in the comments below.

The Function Differential Calculator is a free tool for calculating function differentials and function changes online. Easily calculate the differential of a function and its change and gain insight into the behavior of the function.

How to Use the Function Differential Calculator?

  • Input

    Enter the function for which you want to find the differential and change. Enter the point and argument change. Ensure that you use standard mathematical notation.

  • Calculation

    Once you've input the data, click the "Calculate" button. This instructs the calculator to begin processing the input.

  • Result

    After a while, the calculator will display the differential of the function you entered and its change.

What Is the Function Differential?

The differential of a function measures how a function changes when its input changes. Simply put, it measures the rate of change or slope of a function at a specific point. In calculus, this concept is primarily associated with derivatives.

Function: Usually represented by $$$f(x)$$$, it's the relation between the input (the independent variable), typically $$$x$$$, and the output (the dependent variable), usually $$$y$$$.

Differential: Often denoted by $$$dy$$$ or $$$df(x)$$$, it represents the infinitesimally small change in the function's value as $$$x$$$ changes by an infinitesimally small amount, denoted as $$$dx$$$.

For a function $$$y=f(x)$$$, the differential $$$dy$$$ is defined as follows:



  • $$$f^{\prime}(x)$$$ is the derivative of the function with respect to $$$x$$$.
  • $$$dx$$$ represents a small change in the value of $$$x$$$.

For example, the derivative of the function $$$y=f(x)=x^2$$$ is $$$f^{\prime}(x)=2x$$$. Suppose we want to find the change in the function (differential) when $$$x$$$ changes by a small amount $$$dx$$$. In that case, we can use the following:


This means that the approximate difference between $$$f(3.01)$$$ and $$$f(3)$$$ is


The actual difference is

$$\Delta y=f(3.01)-f(3)=3.01^2-3^2=0.0601$$

The differential of a function gives a deep understanding of its nature and properties. It is used in various fields. In calculus, it is a foundational element for more complex concepts.

How Do Differentials Play an Important Role in Various Fields?

A differential is fundamental in many fields because it shows the change in the function's value as the argument (input) changes by a small amount. In physics, it describes the rate of change. For example, velocity is the displacement differential over time.

In economics and business, understanding the increasing or decreasing nature of a function through differentials helps optimize decisions such as profit maximization or cost minimization.

Moreover, in areas related to predictive analysis, differentials allow experts to estimate changes in functions based on small changes in input data, thereby providing accurate forecasting and modeling.

Thus, the ability to analyze and interpret differentials is of paramount importance in many areas of study and application.

Why Choose Our Function Differential Calculator?

  • Accuracy

    Our calculator uses advanced algorithms to ensure accurate results.

  • User-Friendly Interface

    We prioritize user experience. You can easily navigate our tool thanks to the simple and intuitive layout.

  • Versatility

    Our calculator can handle a wide range of functions, from simple to complex.

  • Speed

    Our calculator provides instant results, saving you time and effort.


What is the purpose of the Function Differential Calculator?

The Function Differential Calculator is created to compute the differential and the change of a function.

What is the differential of a function?

The differential of a function measures how a function changes when its input changes. It gives information about the instantaneous rate of change and slope of the function at a particular point.

Is a differential the same as a derivative?

Although they are closely related, they are not the same. The derivative of a function at a point describes the slope of the tangent to the curve of the function at that point; it is the change in the function at that point. On the other hand, the differential represents an infinitesimal change in the value of the function as its input changes by an infinitesimally small amount. The derivative provides the ratio, while the differential provides the actual change.

What are the types of differentials?

There are primarily two types of differentials:

  • Total Differentials: These take into account changes of all independent variables of a function.
  • Partial Differentials: These take into account one independent variable while keeping others constant.

Both types provide insight into how a function changes and are important for understanding multivariate functions.