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Now let us see how we use the FORECAST function when the known_y’s and known_x’s are calculated using OFFSET and MATCH function:

The sales are linear in this case (which can also be verified manually or using a line graph). a number of units sold in those days) as below: Now let us say we have a dataset of a retail firm, with a number of days and the corresponding sales by the firm in those days (i.e. So we can see in the above screenshot that the FORECAST function also works well for this. So let us now see in the below screenshot what happens when we apply this FORECAST function to interpolate the given x value: known_x’s: This is the known range of x values.known_y’s: This is the known range of y values.x: This is the value or data point whose corresponding value we wish to interpolate or predict.Now let’s say we wish to interpolate the same value in Example1 using the FORECAST function.įORECAST function estimates a value based on existing values along with a linear trend. So, the FORECAST function can be used in such cases. There can be times when it becomes difficult to memorize the formula. So we can see in the above screenshot that we have interpolated a value with two known values of x and y’s. So when we apply this formula to the given dataset, we get the interpolated y value as: So the simple formula that is used to interpolate this value is:

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Therefore, you’ll see the utilization of this function for mission-critical data analytics like forecasting web traffic, modeling financial data, and calculating business performance. It utilizes the first and last values for a given X-value and takes into account the entire data set. The FORECAST.LINEAR functions offer highly accurate data prediction for linear and slightly nonlinear data points.

The FORECAST formula of this tutorial is as follows:.

You can keep on changing the value of X within the range of the given table to fetch Y-values.

Press Enter to retrieve the interpolated value of Y.

Select the known Xs’ cell range and close the formula with a parenthesis.

Then select the known Ys’ value cell range followed by a comma.

Click on the X’s value and put a comma.

Now, type Forecast and select FORECAST.LINEAR function from the formula drop-down menu.

The cell where you want to populate the value for Y should have an equal ( =) sign.

You can quickly determine the value of Y by following these steps: =FORECAST.LINEAR(x, known_y's, known_x's)