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Thus it was the first 3D interpolation to emerge in the literature. This problem is of linear growth therefore the estimated height can easily be calculated using a linear interpolation calculator. The linear interpolation calculator will also calculate you the slope of the linear equation.

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The equation for the linear extrapolation is identical with the formula of the linear interpolation. Only thing that you need to keep in mind is that when using the linear extrapolation, very often the results are not confirmed by experimental data. That is why you need to be sure that the relationship between your data points is linear before you use the linear extrapolation. One thing you could do is to only use every second point for spline or linear interpolation and see the error of the interpolating curve in the data points you didn’t include for interpolation.

Using The Linear Interpolation Calculator

The output of the function will be y, which is the value of the function in the x point. For more calculators for finance, mathematics health, unit converters and more check out our calculators collection. Photo Effects Tool Wide range of AI image tools to repair and improve photos.

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There are two easy techniques for selecting yy that spring to mind. The first step is to determine if xx is closer to x1x1 or x2x2. If xx is near to x1x1, then y1y1 is used as an estimate; otherwise, y2y2 is used. Interpolation refers to a method you can use to determine a future or present value factor when the exact value doesn’t appear on the value table.

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This works well if you are trying to online linear interpolation points for a problem which can be approximated by a linear function. This is used in fields like operations research, costing, and logistics planning. Linear trend are almost universally used for public facing statistical and analytics explainations. The interpolation calculator allows you to calculate the value of a point along a line if you know two other points on that line.

Here, G8 is the value of Day 85 for which you want to interpolate. The above formula finds the value of x1 where the MATCH function returns the relative position of the lookup value. 1 is used to find the lower value if the exact value is not found. Finally, the INDEX function returns the matched value from the known_y’s. In addition, you may use the INDEX and MATCH functions to interpolate any new data point.


If there is a discrete of data points but the supposition is that the data points are obtained from a continuous function. Linear Interpolation Calculator by inserting the elements required by the tool in their labeled fields. All you need is to enter these elements and use a button, the entire results will be provided to you. As we already know that with Interpolation we can find out unknown points therefore It can be used whenever we need to predict unknown values for any geographic point data.

SLOPE and INTERCEPT for computing the slope and intercept respectively. Let’s say, you know the values of two known points A and C of a straight line. And, you want to guess the unknown value y from the point of B when you also know the values of x. In that case, the well-used mathematical equation is as follows. Comparison of linear and bilinear interpolation some 1- and 2-dimensional interpolations. It’s easy to link and share the results of the Linear Interpolation Calculator.

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Replace the trigonometrical function sin(α), for α between 0° and 90°, with a set of data points, with an relative error less than 2%. Since x is inside the interval , we performed a linear interpolation to find the value of y. To connect the source and destination color values in the lattice points of a 3D table. However, the color space transformation utilizes a 3D lookup table . The closest lattice points are used to interpolate nonlattice points. This technique has been popular recently in a variety of applications and has integrated itself into the ICC profile standard.

Spline interpolation uses low-degree polynomials in each of the intervals, and chooses the polynomial pieces such that they fit smoothly together. If the two known locations are provided by the coordinates displaystyle and displaystyle , the linear interpolant is the straight line between them. The value y along the straight line is provided by the equation of slopes for a value x in the interval displaystyle . The technique of determining a value between two points on a line or curve is known as linear interpolation. To assist us also to remember what it implies, consider the initial half of the term, ”inter,” as meaning’ meaning’ enter,” which reminds us to examine ”within” the data we started with. A required interpolated value can be found using this calculator by inputting the given x-y coordinates, the slope, and the point to perform the interpolation.


Linear interpolation is being used from a very ancient time for calculation of the unknown values in tables. Suppose if we have a table for listing the population of some countries in 2000, 2005, 2010 and 2015. And that we wanted to estimate the population in the year 2007.

Interpolation calculator:

Interpolation Calculator is an online tool that helps to calculate the interpolated value, y, for a linear functionwhen we are given certain coordinates. The linear interpolation formula is used to find the new value of the function. To use the interpolation calculator, enter the values in the input boxes. At its very root, interpolation is a simple concept in mathematics. The problem with interpolators is that you can never have full confidence in their estimations.There are different kinds of interpolation you can work with. These include polynomial interpolation, piecewise constant interpolation, and linear interpolation.

  • The chief advantage of using a linear relationship to explain the association between the x value and y value of a given set of data is simplicity.
  • Luckily, you may interpolate any values using the function in Excel.
  • Mapping to a Banach space, then the problem is treated as “interpolation of operators”.
  • It is only required to approach the data points as closely as possible .
  • ExcelDemy is a place where you can learn Excel, and get solutions to your Excel & Excel VBA-related problems, Data Analysis with Excel, etc.
  • Many popular interpolation tools are actually equivalent to particular Gaussian processes.

Interpolation is the process of finding a new value for a function when we already know any two values. On each of the intervals [x2j,x2j+2],0≤j≤n−1, you would use the quadratic interpolating polynomial on the interval for the interpolation of the data. Approximate the data values in those scenarios where the exact points are difficult to find and used to fill the gaps in data. It is the technique of curve fitting through the known values to define the function. A Linear Interpolation Calculator is an online tool that can be used to calculate the coordinates of an interpolation point in discrete data points.

Which is the best Interpolation method?

The latter refers to a method by which you can come up with an estimation for a data point outside of the known data range. Calculator’s output is the y-coordinate of the target interpolation point and number line representation for this point. This online Linear Interpolation Calculator allows you to find the coordinates of an arbitrary point lying on a straight line connecting two known points in the plane. You have to specify the coordinates of the two known points and x- or y- coordinate of the point of interest. After clicking the ‘Calculate’ button you will get the second coordinate of the point of interest as well as the interpolation line parameters. It will give you a detailed step-by-step solution for the calculated interpolated value.


This interpolation calculator applies the linear interpolation formula to derive the dependent value of the third point. This presumes the three points are in a straight line and that there is no natural variation or error in measurement. The Linear interpolation function works fairly well for simple models. It’s a basic forecast function but works relatively well if the given coordinates are from a similar set of data. The new data point will be lined up with the existing trend.

Solved Examples on Interpolation Calculator

It is not truly a classical spline in terms of C2 differentiability, but it has good behavior near the baseline, the the high degree of differentiability is wasted on a problem like this. At best, you can decide which behavior you are willing to tolerate for an interpolant in general. I’ve shown you the different basic behaviors, so you can expect what will happen. A photographer can also use this concept to determine useful information from raw collected data. Scientists are using this to determine possible results out of numerous estimates. Lastly, use the FORECAST function to interpolate and you’ll get your desired output.

Here’s an example that will help you understand the notion of interpolation. Every other day, a gardener is also measuring and tracking the growth of a tomato plant. This gardener is inquisitive, and she wants to know how tall her plant was on the fourth day. The formula is obtained by solving this equation for y, which is the unknown value at x. Under these values, you can also see the whole formula with the values already substituted into it. This gives you a good reference for how you can write down the formula along with the required values.

The equation includes five terms and computes the result by using the five vertices of the provided pyramid. Now we want to calculate the yy value for some xx value that is between x1x1 and x2x2. This yy value approximation is also there as an interpolated value. The weights are inversely proportional to the distance between the endpoints and the unknown location; the closer point has a greater effect than the distant point.



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