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Computer Memory Units Guide

The document defines common memory units used to measure computer storage capacity. It explains that the bit is the smallest unit, with a nibble being 4 bits and a byte being 8 bits. Higher units include the kilobyte (1024 bytes), megabyte (1024 kilobytes), gigabyte (1024 megabytes), terabyte (1024 gigabytes), and petabyte (1024 terabytes). Computer words can vary in length but are a fixed number of bits processed as a single unit by the computer.

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211 views2 pages

Computer Memory Units Guide

The document defines common memory units used to measure computer storage capacity. It explains that the bit is the smallest unit, with a nibble being 4 bits and a byte being 8 bits. Higher units include the kilobyte (1024 bytes), megabyte (1024 kilobytes), gigabyte (1024 megabytes), terabyte (1024 gigabytes), and petabyte (1024 terabytes). Computer words can vary in length but are a fixed number of bits processed as a single unit by the computer.

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6/23/2021 Computer - Memory Units - Tutorialspoint

Computer - Memory Units

Memory unit is the amount of data that can be stored in the storage unit. This storage capacity is
expressed in terms of Bytes.
The following table explains the main memory storage units −

S.No. Unit & Description

Bit (Binary Digit)


1 A binary digit is logical 0 and 1 representing a passive or an active state of a component
in an electric circuit.

Nibble
2
A group of 4 bits is called nibble.

Byte
3 A group of 8 bits is called byte. A byte is the smallest unit, which can represent a data
item or a character.

Word
A computer word, like a byte, is a group of fixed number of bits processed as a unit,
which varies from computer to computer but is fixed for each computer.
4
The length of a computer word is called word-size or word length. It may be as small as
8 bits or may be as long as 96 bits. A computer stores the information in the form of
computer words.

The following table lists some higher storage units −

https://www.tutorialspoint.com/computer_fundamentals/computer_memory_units.htm 1/2
6/23/2021 Computer - Memory Units - Tutorialspoint

S.No. Unit & Description

Kilobyte (KB)
1
1 KB = 1024 Bytes

Megabyte (MB)
2
1 MB = 1024 KB

GigaByte (GB)
3
1 GB = 1024 MB

TeraByte (TB)
4
1 TB = 1024 GB

PetaByte (PB)
5
1 PB = 1024 TB

https://www.tutorialspoint.com/computer_fundamentals/computer_memory_units.htm 2/2

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