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:''For other meanings, see Mega (disambiguation)''
'mega-' (symbol 'M') is an SI prefix in the SI system of units denoting a factor of 10⁶, 1,000,000 (one million).
For example, 1 MW (megawatt) = 1,000,000 watts = 1,000 kilowatts.
Confirmed in 1960, it comes from the Greek μέγας, meaning ''great''.

Contents

Other common examples of usage

Square and cubic forms

Computing

See also

External links

Other common examples of usage

★ one megaton [of TNT] (a unit often used in measuring the explosive power of nuclear weapons) is 1,000,000 tons of TNT.

★ megahertz — frequency of electromagnetic radiation for radio and television broadcasting, GSM, etc. 1 MHz = 1,000,000 Hz

Square and cubic forms

As the SI-prefixes take precedence over exponents,

★ 1 Mm² means one square megametre or the size of a square of 1,000,000 m × 1,000,000 m or $10^\{12\}$ m² (and not 1,000,000 × a square metre or $10^\{6\}$ m²)

★ 1 Mm³ means one cubic megametre or the size of a cube of 1,000,000 m × 1,000,000 m × 1,000,000 m or $10^\{18\}$ m² (and not 1,000,000 × a cubic metre or $10^\{9\}$ m²)

Computing

In computing, mega- can sometimes denote 1,048,576 (2²⁰) of information units (example: a megabyte, 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 a prefix for 2²⁰ to avoid ambiguity, but is yet to be widely used.

See also

★ SI prefix

★ Binary prefix

★ Mebibyte

External links

★ BIPM website