Description
The ROUND function rounds a number to a specified number of digits. For example, if cell A1 contains 23.7825, and you want to round that value to two decimal places, you can use the following formula:
=ROUND(A1, 2)
The result of this function is 23.78.
Syntax
ROUND(number, num_digits)
The ROUND function syntax has the following arguments:

number Required. The number that you want to round.

num_digits Required. The number of digits to which you want to round the number argument.
Remarks

If num_digits is greater than 0 (zero), then number is rounded to the specified number of decimal places.

If num_digits is 0, the number is rounded to the nearest integer.

If num_digits is less than 0, the number is rounded to the left of the decimal point.

To always round up (away from zero), use the ROUNDUP function.

To always round down (toward zero), use the ROUNDDOWN function.

To round a number to a specific multiple (for example, to round to the nearest 0.5), use the MROUND function.
Example
Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.
Formula 
Description 
Result 
=ROUND(2.15, 1) 
Rounds 2.15 to one decimal place 
2.2 
=ROUND(2.149, 1) 
Rounds 2.149 to one decimal place 
2.1 
=ROUND(1.475, 2) 
Rounds 1.475 to two decimal places 
1.48 
=ROUND(21.5, 1) 
Rounds 21.5 to one decimal place to the left of the decimal point 
20 
=ROUND(626.3,3) 
Rounds 626.3 to the nearest multiple of 1000 
1000 
=ROUND(1.98,1) 
Rounds 1.98 to the nearest multiple of 10 
0 
=ROUND(50.55,2) 
Rounds 50.55 to the nearest multiple of 100 
100 