Orders of magnitude (data)

An order of magnitude is a factor of ten. A quantity growing by four orders of magnitude implies it has grown by a factor of 10000 or 10⁴.

This article presents a list of multiples, sorted by orders of magnitude, for digital information storage measured in bits. This article assumes a descriptive attitude towards terminology, reflecting general usage. The article assumes the following:

For the purpose of this article, a group of 8 bits may constitute one byte, a group of 4 bits is assumed to be one nibble. Historically, both assumption have not always been true.
The byte is the most common unit of measurement of information (kilobyte, kibibyte, megabyte, mebibyte, gigabyte, gibibyte, terabyte, tebibyte, etc.).
In 16-bit and 32-bit architectures, having processor registers of these sizes, that chunk of data is usually called a word.
The decimal SI prefixes kilo, mega, giga, tera, etc., are powers of 10. The binary prefixes kibi, mebi, gibi, tebi, etc. respectively refer to similar multiples.

Accordingly:

1 kB (kilobyte) = 10³ bytes = 1000 bytes = 8000 bits
1 KiB (kibibyte) = 2¹⁰ bytes = 1024 bytes = 8192 bits

Orders of magnitude (data)
Binary [bits]		Decimal		Item
Factor	Term	Factor	Term	Item
2⁰	bit	10⁰	bit	1 bit – 0 or 1, false or true, Low or High
				1.442695 bits ( $\log_2 e$ ) – approximate size of a nat (a unit of information based on natural logarithms)
				1.5849625 bits ( $\log_2 3$ ) – approximate size of a trit (a base-3 digit)
2¹				2 bits – a crumb, enough to uniquely identify one base pair of DNA
				3 bits – a triad(e), the size of an octal digit
2²	nibble			4 bits – (aka tetrad(e), nibble, semioctet, or halfbyte) the size of a hexadecimal digit; decimal digits in binary-coded decimal form
				5 bits – the size of code points in the Baudot code, used in telex communication
				6 bits – the size of code points in Univac Fieldata, in IBM "BCD" format, and in Braille. Enough to uniquely identify one codon of genetic code.
				7 bits – the size of code points in the ASCII character set – minimum length to store 2 decimal digits
2³	byte			8 bits – (aka octet or octad(e)) on many computer architectures. – Equivalent to 1 "word" on 8-bit computers (Apple II, Atari 800, Commodore 64, et al.). – the "word size" (instruction length) for 8-bit console systems including: Atari 2600, Nintendo Entertainment System
		10¹	decabit	10 bits – minimum bit length to store a single byte with error-correcting computer memory – minimum frame length to transmit a single byte with asynchronous serial protocols
				12 bits – wordlength of the PDP-8 of Digital Equipment Corporation (built from 1965–1990)
2⁴				16 bits – commonly used in many programming languages, the size of an integer capable of holding 65,536 different values – Equivalent to 1 "word" on 16-bit computers (IBM PC, Commodore Amiga) – the "word size" (instruction length) for 16-bit console systems including: Sega Genesis, Super Nintendo, Mattel Intellivision
2⁵				32 bits (4 bytes) – size of an integer capable of holding 4,294,967,296 different values – size of an IEEE 754 single-precision floating point number – size of addresses in IPv4, the current Internet protocol – Equivalent to 1 "word" on 32-bit computers (Apple Macintosh, Pentium-based PC). – the "word size" (instruction length) for various console systems including: PlayStation, Nintendo GameCube, Xbox, Wii
				36 bits – size of word on Univac 1100-series computers and Digital Equipment Corporation's PDP-10
				56 bits (7 bytes) – cipher strength of the DES encryption standard
2⁶				64 bits (8 bytes) – size of an integer capable of holding 18,446,744,073,709,551,616 different values – size of an IEEE 754 double-precision floating point number – Equivalent to 1 "word" on 64-bit computers (Power, PA-Risc, Alpha, Itanium, Sparc, x86-64 PCs and Macintoshes). – the "word size" (instruction length) for 64-bit console systems including: Nintendo 64, PlayStation 2, PlayStation 3, Xbox 360
				80 bits (10 bytes) – size of an extended precision floating point number, for intermediate calculations that can be performed in floating point units of most processors of the x86 family.
		10²	hectobit	100 bits
2⁷				128 bits (16 bytes) – size of addresses in IPv6, the successor protocol of IPv4 – minimum cipher strength of the Rijndael and AES encryption standards, and of the widely used MD5 cryptographic message digest algorithm
				160 bits – maximum key length of the SHA-1, standard Tiger (hash), and Tiger2 cryptographic message digest algorithms
2⁸				256 bits (32 bytes) – minimum key length for the recommended strong cryptographic message digests as of 2004^[update]
2⁹				512 bits (64 bytes) – maximum key length for the standard strong cryptographic message digests in 2004
		10³	kilobit	1000 bits
2¹⁰	kibibit			1024 bits (128 bytes) - RAM capacity of the Atari 2600
				1288 bits – approximate maximum capacity of a standard magnetic stripe card
2¹¹				2048 bits (256 bytes) – RAM capacity of the stock Altair 8800
2¹²				4096 bits (512 bytes) – typical sector size, and minimum space allocation unit on computer storage volumes, with most file systems – approximate amount of information on a sheet of single-spaced typewritten paper (without formatting)
				4704 bits (588 bytes) – uncompressed single-channel frame length in standard MPEG audio (75 frames per second and per channel), with medium quality 8-bit sampling at 44,100 Hz (or 16-bit sampling at 22,050 Hz)
				8000 bits (10³ bytes) – one kilobyte
2¹³	kibibyte			8192 bits (1,024 bytes) – RAM capacity of a Sinclair ZX81.
				9408 bits (1,176 bytes) – uncompressed single-channel frame length in standard MPEG audio (75 frames per second and per channel), with standard 16-bit sampling at 44,100 Hz
		10⁴		15,360 bits – one screen of data displayed on an 8-bit monochrome text console (80x24)
2¹⁴				16,384 bits (2 kibibytes) – one page of typed text,^[1] RAM capacity of Nintendo Entertainment System
2¹⁵				32,768 bits (4 kibibytes)
2¹⁶				65,536 bits (8 kibibytes)
		10⁵		100,000 bits
2¹⁷				131,072 bits (16 kibibytes) – RAM capacity of the smallest Sinclair ZX Spectrum.
				160 kilobits – approximate size of this article as of 15 April 2010
2¹⁸				262,144 bits (32 kibibytes) - RAM capacity of Matra Alice 90
2¹⁹				524,288 bits (64 kibibytes) – RAM capacity of a lot of popular 8-bit computers like the C-64, Amstrad CPC etc.
		10⁶	megabit	1,000,000 bits
2²⁰	mebibit			1,048,576 bits (128 kibibytes) – RAM capacity of popular 8-bit computers like the C-128, Amstrad CPC etc. Or a 1024 x 768 pixel jpeg image.
				1,978,560 bits – a one-page, standard-resolution black-and-white fax (1728 × 1145 pixels)
2²¹				2,097,152 bits (256 kibibytes)
				4,147,200 bits – one frame of uncompressed NTSC DVD video (720 × 480 × 12 bpp Y'CbCr)
2²²				4,194,304 bits (512 kibibytes)
				4 976 640 bits – one frame of uncompressed PAL DVD video (720 × 576 × 12 bpp Y'CbCr)
				5 000 000 bits – Typical English book volume in plain text format of 500 pages × 2000 characters per page and 5-bits per character.
				5,242,880 bits (640 kibibytes) – the maximum addressable memory of the original IBM PC architecture
				8,000,000 bits (10⁶ bytes) – the preferred definition of megabyte
				8,343,400 bits – one "typical" sized photograph with reasonably good quality (1024 × 768 pixels).
2²³	mebibyte			8,388,608 bits (1024 kibibytes), one of a few traditional meanings of megabyte
		10⁷		11,520,000 bits – capacity of a lower-resolution computer monitor (as of 2006), 800 × 600 pixels, 24 bpp
				11,796,480 bits – capacity of a 3.5 in floppy disk, colloquially known as 1.44 megabyte but actually 1.44 × 1000 × 1024 bytes
2²⁴				16,777,216 bits (2 mebibytes)
				25 000 000 bits – amount of data in a typical color slide
				30 000 000 bits – The first commercial harddisk IBM 350 in 1956 could store 3.75 MiB for a cost of 50 000 USD, equivalent to 435189.72 USD in 2013.^[2]
2²⁵				33 554 432 bits (4 mebibytes) – RAM capacity of stock Nintendo 64 and average size of a music track in MP3 format.
				41,943,040 bits (5 mebibytes) – approximate size of the Complete Works of Shakespeare^[1]
				80 000 000 bits – In 1985 a 10 MB harddisk cost 710 USD, equivalent to 1562.13 USD in 2013.^[2]
				98,304,000 bits – capacity of a high-resolution computer monitor as of 2011, 2560 × 1600 pixels, 24 bpp
				50 – 100 megabits – amount of information in a typical phone book
2²⁶		10⁸		67,108,864 bit (8 mebibytes)
2²⁷				134,217,728 bits (16 mebibytes)
				150 megabits – amount of data in a large foldout map
2²⁸				268,435,456 bits (32 mebibytes)
				144 000 000 bits: In 1980 an 18 MB harddisk cost 4199 USD, equivalent to 12059.41 USD in 2013.^[2]
				423,360,000 bits: a five-minute audio recording, in CDDA quality
2²⁹				536,870,912 bits (64 mebibytes)
		10⁹	gigabit	1,000,000,000 bits
2³⁰	gibibit			1,073,741,824 bits (128 mebibytes)
2³¹				2,147,483,648 bits (256 mebibytes)
2³²				4,294,967,296 bits (512 mebibytes)
				5.45×10⁹ bits (650 mebibytes) – capacity of a regular compact disc (CD)
				5.89×10⁹ bits (702 mebibytes) – capacity of a large regular compact disc
				6.4×10⁹ bits – capacity of the human genome (assuming 2 bits for each base pair)
				6 710 886 400 bits – average size of a movie in Divx format in 2002.^[3]
				8 000 000 000 bits – in 1995 a 1 GB harddisk cost 849 USD, equivalent to 1318.46 USD in 2013.^[2]
2³³	gibibyte			8 589 934 592 bits (1024 mebibytes) – The maximum disk capacity using the 21-bit LBA SCSI standard introduced in 1979.
		10¹⁰		10 000 000 000 bits
2³⁴				17 179 869 184 bits (2 gibibytes). The storage limit of IDE standard for harddisks in 1986, also the volume size limit for the FAT16B file system (with 32 KiB clusters) released in 1987 as well as the maximum file size (2 GiB-1) in DOS operating systems prior to the introduction of large file support in DOS 7.10 (1997).
2³⁵				34,359,738,368 bits (4 gibibytes) – maximum addressable memory for the Motorola 68020 (1984) and Intel 80386 (1985), also the volume size limit for the FAT16B file system (with 64 KiB clusters) as well as the maximum file size (4 GiB-1) in MS-DOS 7.1-8.0.
				3.76×10¹⁰ bits (4.7 gigabytes) – capacity of a single-layer, single-sided DVD
2³⁶				68,719,476,736 bits (8 gibibytes)
				79 215 880 888 bits – 9.2 GiB size of Wikipedia article text compressed with bzip2 on 2013-06-05
		10¹¹		100,000,000,000 bits
2³⁷				137 438 953 472 bits (16 gibibytes).
				1.46×10¹¹ bits (17 gigabytes) – capacity of a double-sided, dual-layered DVD
				2.15×10¹¹ bits (25 gigabytes) – capacity of a single-sided, single-layered 12-cm Blu-ray disc
2³⁸				274,877,906,944 bits (32 gibibytes)
2³⁹				549,755,813,888 bits (64 gibibytes)
		10¹²	terabit	1,000,000,000,000 bits (125 gigabytes)
2⁴⁰	tebibit			1.34×10¹² bits – estimated capacity of the Polychaos dubium genome, the largest known genome. The storage limit for ATA-1 compliant disks introduced in 1994.
				1.6×10¹² bits (200 gigabytes) – capacity of a hard disk that would be considered average as of 2008^[update]. In 2005 a 200 GB harddisk cost 100 USD, equivalent to 121.16 USD in 2013.^[2] As of April 2015, this is the maximum capacity of a fingernail-sized microSD card.
2⁴¹				2,199,023,255,552 bits (256 gibibytes)
2⁴²				4,398,046,511,104 bits (512 gibibytes)
				8 000 000 000 000 bits (1000 gibibytes) In 2010 a 1 TB harddisk cost 80 USD, equivalent to 86.81 USD in 2013.^[2]
2⁴³	tebibyte			8,796,093,022,208 bits (1024 gibibytes)
				(approximately) 8.97×10¹² bits – as of 2010^[update], data of π to the largest number of decimal digits ever calculated (2.7×10¹²)
		10¹³		10 000 000 000 000 bits (1.25 terabytes) – capacity of a human being's functional memory, according to Raymond Kurzweil in The Singularity Is Near, p. 126
				16 435 678 019 584 bits (1.9 terabytes) – Size of all multimedia files used in English wikipedia on May 2012
2⁴⁴				17 592 186 044 416 bits (2 tebibytes) – Maximum size of MBR partitions used in PCs introduced in 1983, also the maximum disk capacity using the 32-bit LBA SCSI introduced in 1987
2⁴⁵				35,184,372,088,832 bits (4 tebibytes)
2⁴⁶				70,368,744,177,664 bits (8 tebibytes)
		10¹⁴		100,000,000,000,000 bits
2⁴⁷				140 737 488 355 328 bits (16 tebibytes). NTFS volume capacity in Windows 7, Windows Server 2008 R2 or earlier implementation.^[4]
				1.5×10¹⁴ bits (18.75 terabytes)
2⁴⁸				281,474,976,710,656 bits (32 tebibytes)
2⁴⁹				562,949,953,421,312 bits (64 tebibytes)
		10¹⁵	petabit	1,000,000,000,000,000 bits
2⁵⁰	pebibit			1,125,899,906,842,624 bits (128 tebibytes)
2⁵¹				2,251,799,813,685,248 bits (256 tebibytes)
2⁵²				4,503,599,627,370,496 bits (512 tebibytes)
				8,000,000,000,000,000 bits (10¹⁵ bytes) – one petabyte
2⁵³	pebibyte			9,007,199,254,740,992 bits (1024 tebibytes)
		10¹⁶		10,000,000,000,000,000 bits
2⁵⁴				18,014,398,509,481,984 bits (2 pebibytes)
2⁵⁵				36,028,797,018,963,968 bits (4 pebibytes) – theoretical maximum of addressable physical memory in the AMD64 architecture^{[citation needed]}
				4.5×10¹⁶ bits (5.625 petabytes) – estimated hard drive space in Google's server farm as of 2004^[update]^{[citation needed]}
2⁵⁶				72,057,594,037,927,936 bits (8 pebibytes)
				10 petabytes (10¹⁶ bytes) – estimated approximate size of the Library of Congress's collection, including non-book materials, as of 2005.^[5] Size of the Internet Archive topped 10 PB in October 2013^[6]
		10¹⁷		100,000,000,000,000,000 bits
2⁵⁷				144,115,188,075,855,872 bits (16 pebibytes)
				2×10¹⁷ bits (25 petabytes) – Storage space of Megaupload file-hosting service at the time it was shut down in 2012^[7]
2⁵⁸				288,230,376,151,711,744 bits (32 pebibytes)
2⁵⁹				576,460,752,303,423,488 bits (64 pebibytes)
				8 ×10¹⁷, the storage capacity of the fictional Star Trek character Data
		10¹⁸	exabit	1,000,000,000,000,000,000 bits
2⁶⁰	exbibit			1 152 921 504 606 846 976 bits (128 pebibytes). The storage limit using the 48-bit LBA ATA-6 standard introduced in 2002.
				1.6×10¹⁸ bits (200 petabytes) – total amount of printed material in the world^{[citation needed]}
				2×10¹⁸ bits (250 petabytes) – storage space at Facebook data warehouse as of June 2013,^[8] growing at a rate of 15 PB/month.^[9]
2⁶¹				2,305,843,009,213,693,952 bits (256 pebibytes)
				2.4×10¹⁸ bits (300 petabytes) – storage space at Facebook data warehouse as of April 2014, growing at a rate of 0.6 PB/day.^[10]
2⁶²				4,611,686,018,427,387,904 bits (512 pebibytes)
2⁶³	exbibyte			9,223,372,036,854,775,808 bits (1024 pebibytes)
		10¹⁹		10,000,000,000,000,000,000 bits
2⁶⁴				18,446,744,073,709,551,616 bits (2 exbibytes).
2⁶⁵				36,893,488,147,419,103,232 bits (4 exbibytes)
				50,000,000,000,000,000,000 bits (50 exabit)
2⁶⁶				73,786,976,294,838,206,464 bits (8 exbibytes)
		10²⁰		100 000 000 000 000 000 000 bits
				1.2×10²⁰ bits (15 exabytes) – estimated storage space at Google data warehouse as of 2013^[11]
2⁶⁷				147 573 952 589 676 412 928 bits (16 exbibytes) – maximum addressable memory using 64-bit addresses without segmentation^[12] Maximum volume and filesize for ZFS filesystem.
2⁶⁸				295,147,905,179,352,825,856 bits (32 exbibytes)
				3.5 × 10²⁰ bits – increase in information capacity when 1 Joule of energy is added to a heat-bath at 300 K (27 °C)^[13]
2⁶⁹				590,295,810,358,705,651,712 bits (64 exbibytes)
		10²¹	zettabit	1,000,000,000,000,000,000,000 bits
2⁷⁰	zebibit			1,180,591,620,717,411,303,424 bits (128 exbibytes)
2⁷¹				2,361,183,241,434,822,606,848 bits (256 exbibytes)
				3.4×10²¹ bits (0.36 zettabytes) – amount of information that can be stored in 1 gram of DNA^[14]
				4.7×10²¹ bits (0.50 zettabytes) – amount of digitally stored information in the world as of May 2009^[15]
2⁷²				4,722,366,482,869,645,213,696 bits (512 exbibytes)
2⁷³	zebibyte			9,444,732,965,739,290,427,392 bits (1024 exbibytes)
		10²²		10,000,000,000,000,000,000,000 bits
2⁷⁶				2⁷⁶ bits – Maximum volume and file size in the Unix File System (UFS) and maximum disk capacity using the 64-bit LBA SCSI standard introduced in 2000 using 512-byte blocks.^[16]
		10²³		1.0×10²³ bits – increase in information capacity when 1 Joule of energy is added to a heat-bath at 1 K (−272.15 °C)^[17]
				6.0×10²³ bits – information content of 1 mole (12.01 g) of graphite at 25 °C; equivalent to an average of 0.996 bits per atom.^[18]
		10²⁴	yottabit	7.3×10²⁴ bits – information content of 1 mole (18.02 g) of liquid water at 25 °C; equivalent to an average of 12.14 bits per molecule.^[19]
2⁸⁰	yobibit			1,208,925,819,614,629,174,706,176 bits (128 zebibytes)
		10²⁵		1.1×10²⁵ bits – entropy increase of 1 mole (18.02 g) of water, on vaporizing at 100 °C at standard pressure; equivalent to an average of 18.90 bits per molecule.^[20]
				1.5×10²⁵ bits – information content of 1 mole (20.18 g) of neon gas at 25 °C and 1 atm; equivalent to an average of 25.39 bits per atom.^[21]
2¹⁵⁰		10⁴⁵		~ 10⁴⁵ bits – the number of bits required to perfectly recreate the natural matter of the average-sized U.S. adult male human being down to the quantum level on a computer is about 2×10⁴⁵ bits of information (see Bekenstein bound for the basis for this calculation).
		10⁵⁸		~ 10⁵⁸ bits – thermodynamic entropy of the sun^[22] (about 30 bits per proton, plus 10 bits per electron).
		10⁶⁹		~ 10⁶⁹ bits – thermodynamic entropy of the Milky Way Galaxy (counting only the stars, not the black holes within the galaxy)^{[citation needed]}
		10⁷⁷		1.5×10⁷⁷ bits – information content of a one-solar-mass black hole.^[23]
2³⁰⁵		10⁹⁰		The information capacity of the observable universe, according to Seth Lloyd. (not including gravitation)^[24]
2^332.1928		10¹⁰⁰		googol
2^{3.321928·googol}		10^googol		googolplex

Note: this page mixes between two kinds of entropies:

Entropy (information theory), such as the amount of information that can be stored in DNA
Entropy (thermodynamics), such as entropy increase of 1 mole of water

These two definitions are not entirely equivalent, see Entropy in thermodynamics and information theory.

For comparison, the Avogadro constant is 6.02214179(3)×10²³ entities per mole, based upon the number of atoms in 12 grams of carbon-12 isotope.

In 2012, some hard disks used ~984573 atoms to store each bit. In January 2012, IBM researchers announced they compressed 1 bit in 12 atoms using antiferromagnetism and a scanning tunneling microscope with iron and copper atoms. This could mean a practical jump from a 1 TB disk to a 100 TB disk.^[2]^[25]

References

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↑ The Internet Archive Has Now Saved a Whopping 10,000,000,000,000,000 Bytes of Data, retrieved October 2nd 2013
↑ 25 petabyte on Megaupload. Retrieved 16 February 2012
↑ [1]
↑ [2]
↑ [3]
↑ Estimated storage space at Google
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ $\scriptstyle\frac{1}{300}$ ^{[citation needed]} J K⁻¹
↑ http://www.tmrfindia.org/ijcsa/V2I29.pdf
↑ "Internet data heads for 500bn gigabytes", The Guardian, 18 May 2009. Retrieved on 23 April 2010.
↑ Lua error in package.lua at line 80: module 'strict' not found.
↑ 1 J K⁻¹. Equivalent to 1/(k ln 2) bits, where k is Boltzmann's constant
↑ Equivalent to 5.74 J K⁻¹. Standard molar entropy of graphite.
↑ Equivalent to 69.95 J K⁻¹. Standard molar entropy of water.
↑ Equivalent to 108.9 J K⁻¹
↑ Equivalent to 146.33 J K⁻¹. Standard molar entropy of neon. An experimental value, see [4] for a theoretical calculation.
↑ Given as 10⁴² erg K⁻¹ in Bekenstein (1973), Black Holes and Entropy, Physical Review D 7 2338
↑ Entropy = $\scriptstyle A c^3 / 4 G \hbar$ in nats, with $A = 16\pi G^2 M^2/c^4$ for a Schwarzschild black hole. 1 nat = 1/ln(2) bits. See Jacob D. Bekenstein (2008), Bekenstein-Hawking entropy, Scholarpedia.
↑ Seth Lloyd (2002), Computational capacity of the universe, Physical Review Letters 88 (23):237901.
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[6] The Internet Archive Has Now Saved a Whopping 10,000,000,000,000,000 Bytes of Data, retrieved October 2nd 2013

[7] 25 petabyte on Megaupload. Retrieved 16 February 2012

[8] [1]

[9] [2]

[10] [3]

[11] Estimated storage space at Google

[12] Lua error in package.lua at line 80: module 'strict' not found.

[13] $\scriptstyle\frac{1}{300}$ ^{[citation needed]} J K⁻¹

[14] ttp://www.tmrfindia.org/ijcsa/V2I29.pdf

[15] "Internet data heads for 500bn gigabytes", The Guardian, 18 May 2009. Retrieved on 23 April 2010.

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[17] 1 J K⁻¹. Equivalent to 1/(k ln 2) bits, where k is Boltzmann's constant

[18] Equivalent to 5.74 J K⁻¹. Standard molar entropy of graphite.

[19] Equivalent to 69.95 J K⁻¹. Standard molar entropy of water.

[20] Equivalent to 108.9 J K⁻¹

[21] Equivalent to 146.33 J K⁻¹. Standard molar entropy of neon. An experimental value, see [4] for a theoretical calculation.

[22] Given as 10⁴² erg K⁻¹ in Bekenstein (1973), Black Holes and Entropy, Physical Review D 7 2338

[23] Entropy = $\scriptstyle A c^3 / 4 G \hbar$ in nats, with $A = 16\pi G^2 M^2/c^4$ for a Schwarzschild black hole. 1 nat = 1/ln(2) bits. See Jacob D. Bekenstein (2008), Bekenstein-Hawking entropy, Scholarpedia.

[24] Seth Lloyd (2002), Computational capacity of the universe, Physical Review Letters 88 (23):237901.

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[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

[13]

[14]

[15]

[16]

[17]

[18]

[19]

[20]

[21]

[22]

[23]

[24]

[25]

v t e Orders of magnitude
Quantity	Acceleration Angular velocity Area Bit rate Capacitance Charge Computing Currency Current Data Density Energy / Energy density / Energy flow density Entropy Force Frequency Inductance Illuminance Length Luminance / Luminous flux Magnetic field Mass Numbers Power Pressure Probability Radiation Resistance Sound pressure Specific energy Specific heat capacity Speed Temperature Time Viscosity Voltage Volume
See also	Back-of-the-envelope calculation Fermi problem Powers of 10 Metric (SI) prefix Macroscopic scale Microscopic scale Quantum realm
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Orders of magnitude (data)

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