![]() We also provide a downloadable excel template. There are two easy techniques for selecting yy that spring to mind. This yy value approximation is also there as an interpolated value. Now we want to calculate the yy value for some xx value that is between x1x1 and x2x2. Here we discuss how to calculate the Interpolation Formula along with practical examples. Determining Linear Interpolation Formula Assume we have two known coordinates, x1,y1x1,y1 and x2,y2x2,y2. ![]() This is a guide to Interpolation Formula. Please keep in mind that interpolation is a statistical and mathematical tool that is used to predict the intermediate values between two points. One of the basic variants of interpolation is the linear interpolation technique which is commonly used by analysts in the field of mathematics, finance and computer programming. Linear interpolation is one of the simplest ways of interpolation. The importance of the interpolation technique can be gauzed from the fact that linear interpolation is believed to be used by Babylonian mathematicians and astronomers in the last three centuries BC, while the Greeks and Hipparchus used it in the 2nd century BC. Y = (y 2 – y 1) / (x 2 – x 1) * (x – x 1) + y 1 Relevance and Use of Interpolation Formula Step 4: Finally, the function for interpolation can be derived by multiplying the slope (step 3) with the difference between the independent variable and the abscissa of any one data point and then adding the corresponding ordinate to the result as shown below. Step 3: Next, calculate the slope of the available data points by dividing the difference between the ordinates by that of the abscissas of the available data points. CoolProp ( is an open source C++ library which could also be used for properties information. Make sure that there are at least two data points as it is the minimum data points required. If you require a reliable source of thermodynamic properties, we recommend you obtain a copy of EES (Engineering Equation Solver) from or REFPROP from. Step 2: Next, gather as many as possible historical and current data points in order to build a function. There is no built-in formula in excel to calculate the Excel interpolation value. ![]() Step 1: Firstly, identify the independent and dependent variables for the function. Interpolation is the process of finding the middle value of the existing data. ![]()
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