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Mega (symbol M) is a SI prefix in the SI system of units denoting a factor of 106, i.e. one million; 1 000 000.

Confirmed in 1960, it comes from the Greek μέγας, meaning great.

For example, 1 MW (megawatt) = 1 000 000 watts = 1 000 kilowatts.

1 Other common examples of usage

2 Computing

In computingOriginally, the word computing was synonymous with counting and calculating, and a computer was a person who computes. Since the advent of the electronic computer, it has come to also mean the operation and usage of these machines, the electrical processe, mega can sometimes denote 1,048,576 (220) of information units (example: a megabyteA megabyte is a unit of measurement for computer storage, memory and information; while its exact definition varies, it is in theory equal to one million bytes. The symbol for megabyte is MB (note B for Byte, lowercase b would mean bit). Three definitions, a megaword), but can denote 1 000 000 (106) of other quantities, for example, transfer rates: 1 megabit/s = 1 000 000 bit/s.

The prefix mebi has been suggested as an alternative for 220 to avoid ambiguity, but is yet to be widely used.

SI prefixes

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(Sub)multiple Prefix Symbol Short scale Name Long scale Name
1024 yotta Y Septillion Quadrillion
1021 zetta Z Sextillion Thousand trillion (Trilliard)
1018 exa E Quintillion Trillion
1015 peta P Quadrillion Thousand billion ( Billiard)
1012 tera T Trillion Billion
109 giga G Billion Thousand million ( Milliard)
106 mega M Million
103 kilo k Thousand
102 hecto h Hundred
101 deca da Ten
10-1 deci d Tenth
10-2 centi c Hundredth
10-3 milli m Thousandth
10-6 micro µ Millionth
10-9 nano n Billionth Milliardth
10-12 pico p Trillionth Billionth
10-15 femto f Quadrillionth Billiardth
10-18 atto a Quintillionth Trillionth
10-21 zepto z Sextillionth Trilliardth
10-24 yocto y Septillionth Quadrillionth



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