Area Between Two Curves Calculator Online, Step by Step

The space in between two curves The area for the specified curves and limits is calculated by the calculator. A definite integral between the specified limits can be used to calculate the area under a curve.

An important use of integration is to calculate the area between two curves. We already know how to calculate the area under a curve using integration; now let’s see how to find the area between two intersecting curves. It is the area of space that, within the predetermined bounds, lies between two linear or non-linear curves.

Although the area between two curves can also be composite, we can easily determine it using integration by making a few little adjustments to the well-known methods for calculating the area under two curves.

Integral calculus can be used to compute the area between two curves, which is the region between two intersecting curves. When we are aware of the equation for two curves and the locations of their intersections, integration can be utilised to determine the area under the curves. As can be seen in the illustration, there are two functions, f(x) and g(x), and we must determine the area between these two curves, which is indicated by the shaded area. The area of the shaded area can then be simply determined using integration. In the section after this, let’s talk more about how this area was calculated.

What is the Area Between two Curves Calculator?

A calculator that helps determine the area between two curves for specified curves and restrictions is available online. You can quickly get the area between two curves with this online calculator for areas between curves. Enter the function and limit values in the provided input box to use this area between the two curves.

We gain our first understanding of the value of calculus for handling complex, real-world systems when we first learn about integrals to determine the area under a curve. A simple illustration of this is calculating the region under a vehicle’s speed vs time curve using a Riemann Sum to estimate the distance the vehicle travelled.

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Finding the space between two curves, however, would be useless. Let’s say that on the weekends, we drag race vehicles at a track. Before every race, we check that the vehicle’s data collecting equipment is configured to record our speed at predetermined intervals throughout each run against the opposition we are racing against. The same data is being recorded at the same intervals by our rival’s data collecting system as well.

We are interested in knowing the margin between our automobile and the competition after each quarter-mile race. To accomplish this, we collect the speed versus time data from both automobiles and calculate the area between the two speed curves throughout the entire period of the relevant quarter-mile run. This will demonstrate how far apart our automobiles were when the victor crossed the finish line.

In other words, we can calculate the gap between the two cars at a given point in the race by calculating the area between these two speed curves.

How to Use the Area Between two Curves Calculator?

To calculate the area using an online area between two curves calculator, please follow the steps below:

Step 1: Visit the between two curves calculators section of the Cuemath website.

Then, Step 2: Enter the larger function and smaller function in the region between two curved calculators provided input boxes.

Then, Step 3: Enter the limits (Lower and Upper bound) values in the area between two curves calculator’s provided input box.

Step 4: To calculate the area for the provided curves and limitations, click the “Calculate” button.

Then, Step 5: Press the “Reset” button to fill in the fields’ new values after clearing them.

How Does Area Between two Curves Calculator Work?

The fundamental theorem of calculus tells us that to calculate the area under a curve y = f(x) from x = a to x = b. It is represented as  b∫a f(x)dx

We first calculate the integration g(x) of f(x), g(x)= ∫f(x) dx and then evaluate g(b) − g(a). That is, the area under the curve f(x) from x = a to x = b is b∫a f(x)dx = g(b) − g(a)

Let y = f(x) and y = g(x) be the curves and a and b are two limits. The formula to calculate the area between two curves is given by

Area= ∫ba [f(x) −g(x)]

The web programming languages HTML (HyperText Markup Language), CSS (Cascading Style Sheets), and JS were mostly used to create this calculator (JavaScript). The architecture of the calculator is created by the HTML, all visual styling elements are created by the CSS, and calculation functionality is provided by the JS.

A JS function is launched when the “calculate” button is clicked. The same exact procedure described in the aforementioned example problems is followed when reading and using the user-inputted values. For the steps of the solution, several intermediate values are prepared and saved.

A JS-native CAS does the indefinite integrals (computer algebra system). By considering each character like a symbol and applying integral rules, the CAS offers almost flawless accuracy. Symbolic computation is the term for this procedure.

All solution stages are formatted after the final answer is rounded and formatted. A LaTeX (a math visual rendering language/technology) rendering engine is used to print the solution and its steps to the solution area.

Area Between Two Curves Calculator With Steps

  • Find the space between two curves that are along the lines by using these straightforward rules.
  • Given two curves P: y = f(x), and Q: y = g (x)
  • By changing one equation value into another and making that equation just have one variable, you may determine the spots where the curve intersects.
  • Find the intersection points by solving that equation.
  • For the specified curves and intersection point, create a graph.
  • Then area will be A = ∫x2x1 [f(x)-g(x)]dx
  • Substitute the values in the above formula.
  • Solve the integration and replace the values to get the result.

Area Between Two Curves Calculator Formula

When attempting to calculate the approximate area of two curves, it is necessary to first split the region into numerous small rectangular strips that are parallel to the y-axis, ranging from x = a to x = b. These rectangular strips will be “dx” in width and “f(x)-g” in height (x). By using integration within the bounds of x = a and x = b, we can now determine the area between these two curves. The area of the small rectangular strip is given by the expression dx(f(x) – g(x)). The following formula can be used if f(x) and g(x) are continuous on [a, b] and g(x) < f(x) for every x in [a, b].

Area= ∫ba [f(x) −g(x)]


  • A graph’s upper function, or the one with a higher y value for a given x, is known as f. (x).
  • The graph’s lower function, or the one with a smaller value of y for a given x, is known as g. (x).
  • On the graph, two distinct regions could have various upper and lower functions. It is crucial to compute the area individually in such circumstances.
  • The region above the y-axis is given a positive indication.
  • The region below the y-axis is given a negative sign.

Area Between Two Curves Calculator with Respect to y

To determine the area of the region, we had to analyse two different integrals. There is another method, though, that just calls for one integral. What if we consider the curves to be functions of y rather than x? Analyze Figure. The function y= f(x) = x² is used to represent the left graph, which is shown in red. The curve may be represented by the function x= v(y)=√ y, and we could just as easily solve this for x. (Remember that x= -√y is likewise a legitimate way to write the function y= f(x)=x² as a function of y.

The graph, however, makes it plain that we are interested in the positive square root.) Similarly, the right graph is represented by the function  y= g(x)= 2−x , but could just as easily be represented by the function  x= u(y)= 2−y . The region is bounded on the left by one function’s graph and on the right by the other function’s graph when the graphs are seen as functions of y. As a result, there is only one integral that needs to be evaluated if we integrate with regard to y.


  • Assume that f(y) has the biggest x value for the specified y and is therefore the correct function on the graph.
  • The graph’s left function, or g, has a smaller value of x for a given value of y. (y).
  • Distinct functions will be used if the graph has different areas. Separate areas should be determined for each region on the graph if there are different ones.
  • The region is given a positive sign directly on the x-axis.
  • The region to the left of the x-axis is marked with a negative sign.

Let’s develop a formula for this type of integration.

Let  u(y)  and  v(y)  be continuous functions over an interval  [c,d]  such that  u(y)≥v(y)  for all  y∈[c,d] . We want to find the area between the graphs of the functions, as shown in image below.

This time, we are going to partition the interval on the y-axis and use horizontal rectangles to approximate the area between the functions. So, for  i=0,1,2,…,n , let  Q=yi  be a regular partition of  [c,d] . Then, for  i=1,2,…,n , choose a point  y∗i∈[yi−1,yi] , then over each interval  [yi−1,yi]  construct a rectangle that extends horizontally from  v(y0∗i)  to  u(y∗i). Image below shows the rectangles when  y∗i  is selected to be the lower endpoint of the interval and  n=10 . The image below shows a representative rectangle in detail.

The height of each individual rectangle is Ag and the width of each rectangle is u(y)-vy). Therefore, the area between the curves is approximately

A ≈ Sum i=1 ^ n [u(yi* )-v(yi* )] ∆ y.

This is a Riemann sum, so we take the limit as ∞, obtaining

A=lim n→∞ sum i=1 ^ n [u(yi * )-v(yi * )] ∆ y

= int cd [u(y)-v(y)]dy.

Area Between Two Polar Curves Calculator

Additionally, we can use integral calculus to determine the area of the intersection of two polar curves. This method is used when there are two curves whose coordinates are given in polar coordinates rather than rectangular coordinates. We can always transform the polar coordinates into rectangle coordinates to solve this problem, although doing so lessens its complexity.

Let us say we have two polar curves r0 = f(θ) and ri = g(θ)as shown in the image, and we want to find the area enclosed between these two curves such that α ≤ θ ≤ β where [α, β] is the bounded region. Therefore, the area between the curves will be:

A=½ ∫βα(r²0−r²i)dθ –

Area Between Two Curves Calculator Compound

Using the aforementioned formulas to calculate the areas between two compound curves that cross each other will result in the wrong answer and cause the curves to move after the junction. We estimated the individual areas between the curves in each segment of the intervals for the curves depicted in the image. The region between the curves will be: Let f(x) and g(x) be continuous in the [a,b] interval.

Area = If(x) – g(x)/dx

[c, d] g(x) = f(x), so we break the limits into two parts as:

As we see in the region [a, b], f(x) = g(x) and in the region Area = {f(x) = g(x)} dx + {g(x) − f(x)} dx

How to find Area Between Two Curves Calculator

First Step:

A= ∫ (Upper Function – Lower Function) dx;  a ≤ 2 ≤ 6

Where A is the space between the curves, a and b are the interval’s left and right endpoints, respectively, and Upper Function and Lower Function are functions of x with greater and lesser values on the interval, respectively.

When calculating the area between two curves, we can give an interval x = [a, b] (which is identical to a < x < b). We can also utilise the interval specifying the region that the two curves enclose if they have at least two junction points.

Let’s use the image below as an illustration. F(x) = x is represented by the blue curve, while g(x) = x³ is represented by the red curve. These two functions’ curves intersect at three points: x = -1, x = 0, and x = 1. Therefore, the area enclosed by them is defined by the interval x = [-1, 1].

Second Step:

The upper and lower functions for the subinterval must be determined after we have the interval we are solving on (s). In some circumstances, the primary interval itself will serve as the sole subinterval. In some situations, the curves will cross each other more than once and change positions as upper and lower functions, as seen in the illustration directly above.

By looking at a graph of the curves, we can clearly identify the upper and lower functions for each subinterval. We can assess the value of each function in the middle of each subinterval even without a graph of the curves. For example, a subinterval of x = [2, 4] has a middle point of x = 3. In order to determine which function has a bigger and a lesser value at that time, we would plug x = 3 into each one.

We can put up an area formula for each subinterval if we are aware of the upper and lower functions for the single or multiple subinterval(s). We add the solutions from each integral of the area formula to find the total area between the curves on our interval. This sum will appear as follows for a problem with n subintervals:

A(total) = A1 + A₂ +…+  An

Area Between Two Curves Calculator Example

Example 1: Area Between Two Curves Calculator

Find the area between two curves f(x) = x² and g(x) = x³ within the interval [0,1] where f(x) ≥ g(x) in the given region.


Given: f(x) = x² and g(x) = x³

Using the formula for the area between two curves:

Area = ∫ba [f(x)− g(x)]dx

Area = ∫10 [x² −x³]dx

= [⅓ x³ − ¼  x⁴]10

= 1/3 – 1/4

= 1/12

Answer: The area between the given curves under the following interval is 1/12

Example 2: Area Between Two Curves Calculator

Find the area between the curve r0 = 2cos(θ) and ri= 1 in the interval [−π/3, π/3] and where −π/3 < θ < π/3 and in the given region r0 ≥ ri.


Given : r0 = 2cos(θ) and ri= 1

Using the formula for the area between two polar curves:

A= ½ ∫βα (r20−r2i)dθA

= ½ ∫π/3−π/3 ((2cosθ)2−(1)2)dθA

= ½ ∫π/3−π/3 1+2cos(2θ)dθ

= ½ {θ+sin(2θ)} ∣π/3−π/3

= π/3+√3/2.

Answer: The area between the curve is π/3+√3/2 square units.

Example 3: Area Between Two Curves Calculator

Find the area for the given curves  f(x) = x2 + 2x and g(x) = x + 3 for the interval [1, 3] and verify it using the area between two curves calculator


Given: f(x) = x² + 2x and g(x) = x + 3

Area=∫ba [f(x) − g(x)]

=∫31 [(x²+2x) − (x+3)]

=∫31 [(x² + x−3)]

= 6.67

Similarly, you can try the area between two curves calculator and find the area for:

f(x) = 5x + 6 and g(x) = 6x² for limits x = -3 to 1

f(x) = x³ / 2 and g(x) = 5x for limits x = 2 to x = 5

FAQs on Area Between Two Curves Calculator

What Does Area Under the Curve Mean?

The region enclosed by the curve, the axis, and the boundary points is referred to as the “area under the curve.” Using the coordinate axes and the integration formula, it is possible to get the two-dimensional area under the curve.

What Does Area Under the Curve Represent?

The region enclosed by the curve and the axis, which is indicated by limiting points, is represented by the region beneath the curve. The area of the asymmetric plane shape in a two-dimensional array is provided by the region beneath the curve.

What is the Formula for Area Between Two Curves Calculator?

We can calculate the area between these two curves by using the given formula. If f(y) and g(y) are continuous on [a, b] and g(y) f(y) for all y in [a, b], then Area = ∫ba[f(x)−g(x)]dx

Is the Area Between Curves Always Positive?

It will always be a non-negative value if there is an area between two curves. The area can only ever be positive or zero, never negative. The formula for calculating the area between two curves is Area = ∫ba[f(x)−g(x)]dx, where dx is the absolute value of the area. It’s never going to be bad.

How to Find the Area Under the Curve?

The integration or antiderivative processes can be used to determine the curve’s area under it. For this, we require the curve’s equation (y = f(x)), the curve’s axis boundary, and the curve’s border limitations. With this, the formula may be used to determine the area enclosed by the curve. A = ∫ba y.dx.

What Are the Different Methods to Find the Area Under the Curve?

The area under the curve can be found using one of three general approaches. By breaking up the space into numerous tiny rectangles, the area under the curve is calculated. The areas are then added to get the overall area. The second technique involves cutting the space into a few rectangles, which are then joined together to create the desired area. Utilizing integration to locate the area is the third approach.

What is the first step toward finding the area between two curves?

Take the integrals of both curves first. After obtaining the integrals for both curves, solve them as usual. The integral of the curve higher on the graph will then be subtracted from the integral of the curve lower on the graph.

How do you use integration to find areas?

You may determine the area under a curve between two points by performing a definite integral between the two points. Integrate y = f(x) between a and b using a limit between a and b to determine the region under the curve y = f. (x). Areas below the x-axis will display negative numbers, and areas above the x-axis will display positive values.

Why are two curves positive?

In order to ensure a good (nonnegative) outcome for each element when solving that kind of problem, one must approach each component separately and integrate the top function and bottom function. No matter where it is located in the plane, “Area between two graphs” is by definition positive.

How do you find the area between two curves in Excel?

In an empty cell of your Excel spreadsheet, enter “LINEST(yrange, range, TRUE, FALSE)”.

To reflect the location of your data for one of the graphs, modify the LINEST command’s arguments.

To obtain the equation for the first set of data, press “Enter.”

Can the area between two curves be negative?

A definite integral could have a negative value. The outcome is negative when all of the interval’s area is below the x-axis but still above the curve.

How do you find the area of a vertical slice?

Area Between Two Curves Using Vertical Slices A = ∫ a b ( g ( x ) − f ( x ) ) dx.

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