byte sizes smallest to largest

byte sizes smallest to largest

byte sizes smallest to largest

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Computer Storage Units Smallest to Largest

Bit is an eighth of a byte*

The bit is the smallest fundamental size of data storage. It is a binary digit meaning that it can take the value of either 1 or 0. All computer data can be broken down to a string of these 1 and 0 (like in the Matrix, only it doesn’t fall down the screen like rain). When represented as a string it is called binary code.

Byte: 1 Byte

A single byte stores eight bits*, eight 1’s or 0’s. This octet of bits is the smallest unit for a base 1,000 order of magnitude naming system as follows…

Kilobyte: 1 thousand or, 1,000 bytes

Files not relying on on the kilo prefix are the boring ones, word docs, excel sheets, most pictures.

Megabyte: 1 million, or 1,000,000 bytes

Still pretty lame. Short videos, music. Even a pre-historic floppy disc can store a bunch of these.

Gigabyte: 1 billion, or 1,000,000,000 bytes

Finally respectable. The GB is quickly becoming the standard by which storage capacity is judged as most computer hardware will advertize capacity in terms of GB’s

Terabyte: 1 trillion, or 1,000,000,000,000 bytes

Currently, hard drive capacity does not exceed this order of magnitude. One terabyte of data can store just under two and a half years of music played continuously. The entire library of congress can be stored on 82 terabytes of data.

Petabye: 1 quadrillion, or 1,000,000,000,000,000 bytes

Now things are getting hardcore. This is the largest order of magnitude which is any single organization claims to have the capacity of and/or handle. All of the user photo’s on Facebook is estimated at close to 1 petabyte of data. Google processes an estimated 20 petabytes of data a day.


Exabyte: 1 quintillion, or 1,000,000,000,000,000,000 bytes

The exabyte is borderline hypothetical at this point. It is theorized that, per month, the entire internet (yeah, lolcats and all) see’s about 5-8 exabytes of traffic. It was proposed that in 2006 all computer data would fit on 160 exabytes of data.

Zettabyte: one sextillion or 1,000,000,000,000,000,000,000

WARNING, WARNING you are now in the DANGER ZONE of data storage capacity.It is estimated that by the year 2010 all digital data in existence will sum up to just under one Zettabyte.

Yottabyte: 1 septillion, or 1,000,000,000,000,000,000,000,000 bytes

Trying to quantify this may make your head explode so you’ll need to sign a release before I go any further.

*a byte can actually be composed of any number of bits, however, eight is standard


Units of Memory

A computer processor is made up of multiple decisive circuits, each one of which may be either OFF or ON. These two states in terms of memory are represented by a 0 or 1. In order to count higher than 1, such bits (BInary digiTS) are suspended together. A group of eight bits is known as a byte. 1 byte can represent numbers between zero (00000000) and 255 (11111111), or 28 = 256 distinct positions. Of course, these bytes may also be combined to represent larger numbers. The computer represents all characters and numbers internally in the same fashion.

In practice, memory is measured in KiloBytes (KB) or MegaBytes (MB). A kilobyte is not exactly, as one might expect, of 1000 bytes. Rather, the correct amount is 210 i.e. 1024 bytes. Similarly, a megabyte is not 10002 i.e. 1, 000, 000 bytes, but instead 10242 i.e. 1, 048, 576 bytes. This is a remarkable difference. By the time we reach to a gigabyte (i.e. 10243 bytes), the difference between the base two and base ten amounts is almost 71 MegaByte.

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Both computer memory and disk space are measured in these units. But it’s important not to confuse between these two. “12800 KB RAM” refers to the amount of main memory the computer provides to its CPU whereas “128 MB disk” symbolizes the amount of space that is available for the storage of files, data, and other types of permanent information.

Types of various Units of Memory-

  • Byte
  • Kilo Byte
  • Mega Byte
  • Giga Byte
  • Tera Byte
  • Peta Byte
  • Exa Byte
  • Zetta Byte
  • Yotta Byte


In computer systems, a unit of data that is eight binary digits long is known as a byte. A byte is a unit that computers use to represent a character such as a letter, number, or a typographic symbol (for example, “h”, “7”, or “$”).  byte can also grasp a string of bits that need to be used in some larger units of application processes (e.g., the stream of bits that composes a visual image for a program that represents images or the string of bits that composes the machine code of a computer program).
A byte is abbreviated with a big “B” whereas a bit is abbreviated with a small “b”. Computer storage is generally measured in multiples of the byte. For example, a 640 MB hard drive holds a nominal 640 million bytes – or megabytes – of data. Byte multiples are made up of exponents of 2 and generally expressed as a “rounded off” decimal number. For example, two megabytes or 2 million bytes are actually 2, 097, 152 (decimal) bytes.

byte sizes smallest to largest
byte sizes smallest to largest

The Conflict

Once a KiloByte was considered truly massive at a time. Some felt that writing 210 was a bit unwisely and also might also confuse others. 1,024 bytes appeared to be slightly awkward, and for ease of use, the kilobyte began to be referred to simply as 1,000 bytes of data and just ignore the left 24 Bytes. The majority might assume that the KiloByte is just 1, 000 Bytes of data but that’s not the case. This was done as the people with no knowledge of binary will not get the extra 24 bytes of storage.

As time passed, and we started to use MegaByte (MB), it became harder to neglect 24 KB of data, but not hard enough. when GigaByte was started to use it became very hard to ignore 24 MB of storage. Now imagine ignoring 24 GB or even 24 TB of data.


The Solution

Since it was hard to ignore such a large amount of data, they started to call KB as 1024 Bytes, 1 GB as 1024 MB, etc. But now it was too late, people now know that the KB was 1, 000 Bytes and not 1, 024 Bytes. An effort was set by the American organization NIST (National Institute of Standards and Time) and the International Electrotechnical Commission (IEC) to resolve the issue.

As it was very difficult to make small modifications as it tends to big changes to the world of science and technology, it was decided in 1998 that “kibibyte (KiB)” would be used to signify 1,024 bytes while that the KiloByte would be retained solely for 1,000 bytes. Similarly “mebibyte (MiB)” would be used to represent 1,048,576 bytes while megabyte (MB) still referred to 1,000,000 bytes.

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Unfortunately, it seems that the actions of these regulators have not helped to clarify the difference between the kilobyte and the kibibyte. The fact that the word “kilobyte” has simply become too deep-rooted in international culture.


The kilobyte is the smallest unit of memory measurement but greater than a byte. A kilobyte is 103 or 1, 000 bytes abbreviated as ‘K’ or ‘KB’. It antecedes the MegaByte, which contains 1, 000, 000 bytes. One kilobyte is technically 1, 000 bytes, therefore, kilobytes are often used synonymously with kibibytes, which contain exactly 1, 024 bytes (210).
Kilobytes are mostly used to measure the size of small files. For example, a simple text document may contain 10 KB of data and therefore it would have a file size of 10 kilobytes. Graphics of small websites are often between 5 KB and 100 KB in size. Individual files typically take up a minimum of four kilobytes of disk space.


One megabyte is equal to 1, 000 KBs and antecedes the gigabyte (GB) unit of memory measurement. A megabyte is 106 or 1, 000, 000 bytes and is abbreviated as “MB”. 1 MB is technically 1, 000, 000 bytes, therefore, megabytes are often used synonymously with mebibytes, which contain exactly 1, 048, 576 bytes (220).
Megabytes are mostly used to measure the size of large files. For example, a high-resolution JPEG image might range in size from 1-5 megabytes. A 3-minute song saved in a compressed version may be roughly 3MB in size, and the uncompressed version may take up to 30 MB of disk space. Compact Disk’s capacity is measured in megabytes (approx 700 to 800 MB), whereas the capacity of most other forms of media drives, such as hard drives and flash drives, is generally measured in gigabytes or terabytes.


One gigabyte is equal to 1, 000 MBs and precedes the terabyte(TB) unit of memory measurement. A gigabyte is 109 or 1, 000, 000, 000 bytes and is abbreviated as “GB”. 1 GB is technically 1, 000, 000, 000 bytes, therefore, gigabytes are used synonymously with gibibytes, which contain exactly 1, 073, 741, 824 bytes (230).
Gigabytes, are sometimes also abbreviated as “gigs, ” and are often used to measure storage device’s capacity. e.g., a standard DVD drive can hold 4.7 GBs of data. Storage devices that hold 1, 000 GB of data or more are measured in terabytes.

gigabytes are used synonymously with gibibytes
gigabytes are used synonymously with gibibytes



One terabyte is equal to 1, 000 GBs and precedes the petabyte(PB) unit of memory measurement. A terabyte is 1012 or 1, 000, 000, 000, 000 bytes and is abbreviated as “TB”. 1 TB is technically 1 trillion bytes, therefore, terabytes and tebibytes are used synonymously, which contains exactly 1, 099, 511, 627, 776 bytes (1, 024 GB) (240).
Mostly the storage capacity of large storage devices is measured in TeraBytes. Around 2007, consumer hard drives reached a capacity of 1 TeraByte. Now, HDDs are measured in Terabytes e.g., a typical internal HDD may hold 2 Terabytes of data whereas some servers and high-end workstations that contain multiple hard drives may even have a total storage capacity of over 10 Terabytes.

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Peta Byte

One petabyte is equal to 1, 000 TBs and precedes the exabyte unit of memory measurement. A petabyte is 1015 or 1, 000, 000, 000, 000, 000 bytes and is abbreviated as “PB”. A petabyte is lesser in size than a pebibyte, which contains exactly 1, 125, 899, 906, 842, 624 (250) bytes.
Most of the storage devices can hold a maximum of a few TBs, therefore, petabytes are rarely used to measure memory capacity of a single device. Instead, PetaBytes are used to measure the total data stored in large networks or server farms. For example, Internet Giants like Google and Facebook store more than over 100 PBs of data on their data servers.

Exa Byte

One exabyte is equal to 1, 000 PBs and precedes the zettabyte unit of memory measurement. An exabyte is 1018 or 1, 000, 000, 000, 000, 000, 000 bytes and is abbreviated as “EB”. Exabytes are lesser than exbibytes, which contain exactly 1, 152, 921, 504, 606, 846, 976 (260) bytes.
The exabyte unit of memory measurement is so large, that it is not used to measure the capacity of storage devices. Even the data storage capacity of the biggest cloud storage centers is measured in PetaBytes, which is a fraction of 1 EB. Instead, exabytes measure the amount of data over multiple data storage networks or the amount of data that is being transferred over the Internet for a certain amount of time. E.g., several hundred exabytes of data is transferred over the Internet every year.

Zetta Byte

One zettabyte is equal to 1, 000 exabytes or 1021 or 1, 000, 000, 000, 000, 000, 000, 000 bytes. A zettabyte is a little bit smaller than zebibyte that contains 1, 180, 591, 620, 717, 411, 303, 424 (270) bytes, and is abbreviated as “ZB”. One zettabyte contains one billion TBs or one sextillion bytes which means it will take one billion one terabyte hard drives to store one zettabyte of data. Generally, Zettabyte is used to measure the large amounts of data and all the data in the world is just a few zettabytes.

Yotta Byte

One yottabyte is equal to 1, 000 zettabytes. It is the largest SI unit of memory measurement. A yottabyte is 1024 ZettaBytes or 1, 000, 000, 000, 000, 000, 000, 000, 000 bytes and is abbreviated as “YB”. It is a little bit smaller than yobibyte, which contains exactly 1, 208, 925, 819, 614, 629, 174, 706, 176 bytes (280) bytes.

1 yottabyte contains one septillion bytes which are exactly the same as one trillion TBs. It is a very large number that humans can evaluate. There is no practical use of such a large measurement unit because all the data in the world made of just a few zettabytes.

Some Misconceptions

The size on a disk with one KB is 1024 Bytes although it signifies 1, 000 Bytes of data. It’s just the old standard everyone remembers.

The download speed Kbps is 1, 000 Bits per second, not 1, 024 Bits per second.


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