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# Excel 2013 Tutorial The Function Library

## Introduction

While Working on Excel, you will see hundreds of function in Excel 2013 library. But which functions you use most of time depends on type of data you are working on in Excel. This is not important to learn and understand each and every function of Excel, but you should try some of them, so that you will know. You can find and search functions you need from function library that is built-in Excel 2013. There are lots of functions of different categories in Excel’s library like Financial, Logical, Text, Date Time, Math and Trigonometry.

To access functions library you have to click on FORMULAS Tab and different categories will be shown. You can select any Category to search function you want.

## How to Use a Function from the Function Library

If you want to use a Function from library, to do so we will use a simple Example to make you understand. We have some data in our excel Workbook, suppose we have ordered a few things online and we have written the DATE OF ORDER and when each item has been delivered we have also written the DATE OF DELIVERY. So we will calculate the Number of Days each item took to be delivered.

Column A is showing the Name of Items ordered, Column B is showing Date of order, and Column C is Showing Date of Delivery. And Column D will contain number of Days each item took to be Deliver.

1. We will now select the Cell that will contains the function, in example we are using, we have selected Cell D1.

2. Click on FORMULAS tab and access functions library and Click on Date & Time Function Category. You will see many functions, but you need to find NETWORKDAYS function.

3. When you click on NETWORKDAYS a window will appear that will ask you for Select cells as argument, Start Date and End Date. We have selected Cell B1 as Start Date and Cell C1 as End date.

4. After you have entered arguments Click OK, and your Desired Calculation will Appear in Cell D1, which is Net Days to Deliver an Item of Cell A1.

5. Now we have Calculated Net Days for one item, now we need to Calculate Net Delivery Days for other three items, for that we don’t need to insert that formula again, there is another easy way to do that. Click on the Cell D1 that contains formula, then click and hold on Fill Handle and drag downward to the last cell with values or items you want to calculate.

6. Your Days of Delivery for all items will be calculated. Wasn’t this so easy?

## The Insert Function Command

Now we will learn about how to use functions using Insert Function Command. This command is easy to find and implement, you may need a little expertise to use this command but it will be great helpers for you. To use Insert Function Command Pease Follow steps below.

1. Select any Cell Where you want to apply function, Go to Formula Tab on top bar of Excel. And Click on Insert Function Command.

2. After Clicking on Insert Function Command, a window will appear, which will ask you to type a brief description of what you want to do and click go.

3. We will type “count number of cells”, that means we need to count number of cells within a range. And will show us some function those were matches our Keyword phrase. And we will select our desired functions. Suppose we have selected COUNTA function, because we need to calculate number of cells.

4. When you click OK after selecting COUNTA function, a window will appear that will ask you to enter Cell range as parameter, so enter Start Cell Number and End Cell Number and Click OK. Or Select all Cells you want to count and you answer or number of cells will appear in that window.

5. After selecting cells Click OK, and your desired calculations, or Number of Cells will appear in the Cell that contains formula.

This was all basics of function library, if are comfortable of this basic then you can try more advance functions in Function Library of different categories. We Hope This Tutorial was a good help for you.