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Average Rate of Change Calculator

Average Rate of Change Calculator

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Use this online average rate of change calculator that helps you to determine the average rate of a function on the given interval. Well, it is a rate that tells how a number changes on average with another. So, let’s dive in, to understand how to find average rate of change with a formula.

What is the Average Rate of Change?

Generally, it defines how one quantity changes with the change in the other value. In other words, the average rate of change of a given function between input values is expressed as the total change of the output function divided by the change in input values.

Average Rate of Change Formula:

The standard average rate of change equation is:
$$\frac {f(b)−f(a)} {b−a}$$

• (a, f(a)) are coordinates of the first point
• (b, f(b))are coordinates of other point.
If its value is positive, which means the coordinate increases as the other coordinate also increases. Apart from this, it can be negative when one coordinate increases, while the second coordinate decreases.
However, the average rate of change calculator finds the total change of a function with its standard formula.

How to Find Average Rate of Change of a Function?

If you know the intervals and a function, then, we apply the standard formula that calculates the average rate.
Here’s an exercise for determining the average rate of change of a function.
Find the average rate of change of function f(y) = 3y2 + 5 on the y interval (-1, 3).
Where value of set a = -1 and b = 3 so that “a” is the left interval, and b is the right side on interval.
$$f(a) = 3(-12) + 5 = 8$$
$$f(b) = 3(32) + 5 = 32$$
Now, let’s substitute values into the average rate of change formula.
$$ \frac{(32 – 8)}{(3 – (-1))}$$
$$\frac{24}{4} = 6$$
Hence, the average change is 6, which can be determined with an average rate of change calculator instantly step-by-step calculations by plug in the values in related fields.

However, an Online Instantaneous Rate of Change Calculator allows you to determine instantaneous rate of change at a specific point.

How to find Average Rate of Change from a Table?

The function is displayed in the table. Find the average rate of change where the interval\( 1 < x < 3\).

x f (x)
0 4
1 8
2 13
3 18

If the average rate of change over an interval is between 1 < x < 3, then you are examine the points (4, 8) and (13, 18). From the first point, let a = 4, and f (a) = 8. From the second point, let b = 13 and f (b) = 18.
Now, put the values into the formula:
$$f(b) – f(a) / b – a = 18 – 8 / 13 – 4 = \frac{10}{9}$$
So, the y-value change 10 units always the x-value change 9 unit, on this interval, also you can find these value by substituting the values in the average rate of change calculator.

Finding Average Rate of Change from a Graph:

Function m (x) is shown in the graph. Calculate average rate of change between the interval 1 < x < 4.
If the interval between 1 < x < 4, then you need to finding the points (1,1) and (4,3), as seen on the graph. Let’s asume a = 1, and m (a) = 1. And the second is b = 4 and m (b) = 3.
Add values into the formula for average rate of change:
$$\frac{m (b) – m (a)}{b – a}$$
$$3- 1 / 4 – 1 = 2 / 3$$
Therefore, the y-values change 2 units always the change in x-values are 3 units, on this specific interval.

Furthermore, an Online Slope Calculator helps to calculate the slope or gradient between two points in the Cartesian coordinate plane.

How Average Rate of Change Calculator Works?

This handy calculator determines the average rate of change with the following steps:


• Firstly, enter a function for calculating the average rate.
• Now, plug in the values of the interval
• Press the calculate button


• Initially, the calculator displays the given function and interval.
• Then, provide the stepwise solution.
• Hence, you can do calculations numerous times by click on the “Recalculate” button.


Can Average Rate of Change be Negative?

Yes, it can be negative because it is just the slope of a line, therefore, if the line is going down then the slope is negative and vice versa.

Define the Percentage Change?

The % Change will quantify the conversion from one number to another number and express the change as a decrease or increase.

Define the Difference Between the Slope and the Rate of Change?

The slope is the ratio of horizontal and vertical change among the two points on a line or surface. So, the horizontal change between two points is run and the vertical change is called the rise.

The Takeaway:

This online average rate of change calculator allows you to find the change of a given function between two different points. Well, the good news is this handy calculator provides the step-by-step solution with a fraction of a second, which is very useful for the students and tutors, who are working with the average rate of change.


From the source of Wikipedia: Slope Formula, Calculating Slope from a Graph, Slope Formula and Coordinates, Slope of Horizontal and Vertical Lines.

From the source of Math Bits notebook: Linear Functions, Non-Linear Functions, the average rate of change from a table.
From the source of Brilliant: Average and Instantaneous Rate of Change, Instantaneous Rate of Change.