In this Article

This Tutorial demonstrates how to use the **Excel INTERCEPT Function** in Excel to calculate the y intercept.

## INTERCEPT Function Overview

The INTERCEPT Function Calculates the Y intercept for a best-fit line for known Y and X values.

To use the INTERCEPT Excel Worksheet Function, select a cell and type:

(Notice how the formula inputs appear)

## INTERCEPT Function Syntax and inputs:

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=INTERCEPT(known_ys,known_xs) |

**known_y’s** – An array of known Y values.

**known_x’s** – An array of known X values.

## What is INTERCEPT?

The INTERCEPT function in Excel is used to calculate the y-intercept of a line given known *x* and *y* values.

The INTERCEPT function can be used in conjunction with the SLOPE function to find the equation of a linear line,

Suppose I have a table of data with x and y values:

The y-intercept of the line can be found by extending the of best fit backwards until it intercepts the y-axis:

Using the above chart, we find the intercept, *a* to be zero.

Using the INTERCEPT function:

## How to use INTERCEPT

The INTERCEPT function takes two arguments:

1 |
=INTERCEPT(known_y’s, known_x’s) |

Where *known_y’s* and *known_x’s* refer to the *x* and *y* data in your data table.

Using our first example, the function is written as:

1 |
=INTERCEPT(B3:B7,C3:C7) |

## Pairing SLOPE and INTERCEPT

To pair SLOPE and INTERCEPT, an equation can be written as:

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= INTERCEPT(B3:B7,C3:C7) + SLOPE(B3:B7,C3:C7) * x |

## Interested in More Forecasting?

Pair INTERCEPT with SLOPE to see how to create the equation of a line and visit our other articles on Forecasting with Exponential Smoothing, TREND and LINEST functions.

## GROWTH** function in Google Sheets**

The GROWTH function works exactly the same in Google Sheets as in Excel.

## INTERCEPT Examples in VBA

You can also use the INTERCEPT function in VBA. Type:

`application.worksheetfunction.intercept(known_ys,known_xs)`

For the function arguments (known_y’s, etc.), you can either enter them directly into the function, or define variables to use instead.

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