In computer science, precision of a numerical quantity is a measure of the detail in which the quantity is expressed. This is usually measured in binary bits, but sometimes in decimal digits. See precision (arithmetic).

In java, one of the few programming languages with standardized precision data types, the following precisions are defined for the standard integer numerical types of the language. The ranges given are for signed integer values represented in standard two's complement form.

Precision of java data types

Type name	Precision (binary bits)	Range
byte	8	-128 to +127
short	16	-32,768 to 32,767
int	32	-2,147,483,648 to 2,147,483,647
long	64	-9,223,372,036,854,775,808 to -9,223,372,036,854,775,807