Use ROUND to round a value to a specified number of decimal places, an integer, or a power of 10.
When the NEAREST direction argument is used, if the fractional part of x is .5 or greater:
 a positive value is rounded up,
 a negative value is rounded down.
It is also possible to round to a negative number of decimal places. This will round to powers of 10. The MROUND function can also be used to do this, and can also round to numbers that aren't a power of 10.
Syntax
ROUND(x[,y][,d][,m])
The ROUND function has the following arguments:
Argument  Data type  Description 
x: number  Numeric line item, property, or expression  The number that you want to round. 
y: number  Numeric line item, property, or expression  The number of decimal places to round x to. If omitted, x will be rounded to an integer. 
d: direction  Keyword 
This keyword determines which rounding direction the function uses to round. If omitted, the function uses the NEAREST direction. The available keywords are:

m: method  Keyword 
This keyword determines which rounding method the function uses. If omitted, the function uses the NORMAL rounding method. The available keywords are:

Returns

Numeric line item, property, or expression 
Excel equivalent
Examples
Formula  Description  Result 
ROUND(12.344) 
Only the value to be rounded, 12.344, has been provided. The formula uses the default arguments of: 0 decimal places, the NEAREST direction, and NORMAL rounding method  12.0 
ROUND(12.344, 1, DOWN) 
This formula contains arguments of 1 decimal place and the DOWN direction. This means that 12.344 is rounded down to one decimal place.  12.3 
ROUND(12.5) 
As this formula only contains ROUND and a value to be rounded, it uses the default arguments of: 0 decimal places, the NEAREST direction, and NORMAL rounding method. As 12.5 is a positive number, it rounds up.  13 
ROUND(12.5) 
As this formula only contains ROUND and a value to be rounded, it uses the default arguments of: 0 decimal places, the NEAREST direction, and NORMAL rounding method. As 12.5 is a negative number, it rounds down.  13 
ROUND(532.8340, 2, TOWARDSZERO) 
This formula contains arguments of 2 decimal places and the TOWARDSZERO direction. This means that x is rounded down towards zero to 2 decimal places. This usage of ROUND could be used to calculate the price of a product. Rounding towards zero maximizes profit margin.  532.83 
ROUND(28.152839, 1, UP) 
This formula contains arguments of 1 decimal place and the UP direction. This means that 28.152839 is rounded up to one decimal place.  28.2 
ROUND(2.509, 2, NEAREST, NORMAL) 
This is an example where the NORMAL rounding method results in a small degree of error.  2.5100000000000002 
ROUND(2.509, 2, NEAREST, EXACT) 
The additional processing performed by the EXACT rounding method corrects the small degree of error in the previous example.  2.51 