In Excel, the ROUND function is used to round numbers to a specified number of digits. It can round on either side of a decimal point. The ROUND function alters the value of the data in the cell, unlike formatting options that allow you to change the number of decimal places displayed without actually changing the value in the cell.

As a result of this change in data, the ROUND function affects the results of calculations in the spreadsheet. You can also use the ROUND function in tandem with other functions, such as ROUND and SUM, which creates a nesting function and accomplishes multiple problems at once.

## The ROUND Function's Syntax and Arguments

A function's syntax refers to the layout of the function and includes the function's name, brackets, and arguments.

The syntax for the ROUND function is:

The arguments for the function are Number and Num_digits:

**Number **is** **the value to be rounded. This argument can contain the actual data for rounding, or it can be a cell reference to the location of the data in the worksheet. It is a required element.

**Num_digits** is the number of digits that the *Number* argument will be rounded to. It is also required.

- If the
*Num_digits*argument is set to zero, the function rounds the value up or down to the nearest integer. - If the
*Num_digits*argument is greater than zero, the value is rounded to the specified number of decimal places. - If the value of the
*Num_digits*argument is set to**2**, the function leaves two digits to the right of the decimal point and rounds the last digit up or down to the next number. - If the
*Num_digits*argument is negative, all decimal places are removed and the function rounds up or down that number of digits to the left of the decimal point. - If the value of the
*Num_digits*argument is set to**-2**, the function removes all digits to the right of the decimal point and rounds the first and second digits to the left of the decimal point up or down to the nearest 100.

If you always want to round numbers up, use the ROUNDUP function. If you always want to round numbers down, use the ROUNDDOWN function.

The image above displays examples for a number of results returned by Excel's ROUND function for data in column A of a worksheet.

The results, shown in column C, depend on the value of the *Num_digits* argument.

For example, to reduce the number 17.568 in cell A5 in the image to two decimal places using the ROUND function, options for entering the function and its arguments include:

- Typing the complete function:
into cell*=ROUND(A5,2)***C5**in the worksheet - Selecting the function and arguments using the function's dialog box.

Although it is possible to type the complete function by hand, many people find it easier to use the dialog box to enter a function's arguments.

## How to Use the Dialog Box

For this example, open an Excel spreadsheet and enter the values in column A of the image into the corresponding column and rows of the spreadsheet.

To use the dialog box to enter the ROUND function into cell C5:

- Select cell
**C5**to make it the active cell. This cell is where the results of the ROUND function will be displayed. - Select the
**Formulas**tab of the ribbon menu. - Choose
**Math & Trig**from the ribbon to open the function drop-down list. - Select
**ROUND**in the list to bring up the function's dialog box. - In the dialog box, select the
**Number**line. - Select cell
**A5**in the worksheet to enter that cell reference into the dialog box. - Select the
**Num_digits**line. - Type a
**2**to reduce the value in A5 to two decimal places. - Select
**OK**to close the dialog box and return to the worksheet.

The answer **17.57** should appear in cell C5. When you select cell C5, the complete function *=ROUND(A5,2)* appears in the formula bar above the worksheet.

## Why the ROUND Function Returned 17.57

Setting the value of the* Num_digits* argument to *2* reduces the number of decimal places in the answer from three to two. Because *Num_digits* is set to 2, the** 6** in the number 17.568 is the rounding digit.

Since the value to the right of the rounding digit — the number 8 — is greater than 4, the rounding digit is increased by one giving a result of 17.57.