# Excel Functions and Formulas Introduction

Create a formula | Edit a formula | Copy a formula | Insert a function

This post will guide you how to **create new function or formulas** in excel. How to edit a formula in excel? How to copy or paste a formula in excel 2013?

## What is Excel Formulas?

A formula always starts with an equal **sign (=)**, which can be followed by numbers, math operators (like a + or – sign for addition or subtraction), and built-in Excel functions, which can really expand the power of a formula.

In short, excel formulas is an expression consist of the following elements: **Math operators (+,-,*,/)**, **Cell references** (row or column name or range: A2:A5), **worksheet functions**(such as: date, time, count).

Excel formulas example:

**=B1+B2**

The above formulas example will add the value of cell B1 to the value of cell B2.

## Create a Formula

If you want to create a formula, you just need to type it in formula bar under excel ribbon.

For example, enter values in **A2** and **A3** cells, while you clicking **A4 **cell, you will noticed that the excel formula bar is blank… now enter one formula for the current cell **A4**, like as: **=A2+A3**, then the calculated result will be shown in the Cell A4.

**1#** Input values in **A2** and **A3** cells

**2#** clicking **A4** cell, checking the excel formula bar

**3#** enter one formula in the formula bar: **=A2+A3**

**4#** let’s see the results in the cell **A4**, it will add the summing value** A2** and **A3** to **A4** cell.

## Edit a Formula

If you want to modify excel formula for a special excel cell, you just need to click that cell , then edit its formula in the formula bar. Let’s see the below steps:

**1#** click one cell that you want to edit its formula

**2#** modify the formula as: **=A2*A3**

**3#** then press “**enter**” , let’s see the current result.

## Copy a Formula

If you want to copy one cell formula(A4) to another cell(B4), just following the below steps:

**1#** clicking the cell **A4**, right click it and then click “**copy**” or just press key **“CTRL” + “C”**

**2#** clicking the cell **B4**, then right click it , click “**Paste Formula**” under “**Paste Options:**”

**3#** Let’s see the result:

## Insert a Function/using Excel built-in function

If you want to insert a function in excel formula bar for one cell, you can just type **“=”** sign, and then type any alphabet you will see that the searched functions. Or just click “**Insert Function**” button next to formula bar. Let’s see the below steps:

**1#** select one cell, such as: **C4**

**2#** type “**=**” sign, then input “**S**” character, you will see that all functions starting with “**S**” will show.

Or you can just only click “**Insert Function**” button to select functions.

Let’s see the results: