## ››Convert millimetre to megametre

 millimetre megameter

How many millimetre in 1 megameter? The answer is 1000000000.
We assume you are converting between millimetre and megametre.
You can view more details on each measurement unit:
millimetre or megameter
The SI base unit for length is the metre.
1 metre is equal to 1000 millimetre, or 1.0E-6 megameter.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between millimetres and megameters.
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## ››Definition: Millimeter

A millimetre (American spelling: millimeter, symbol mm) is one thousandth of a metre, which is the International System of Units (SI) base unit of length. The millimetre is part of a metric system. A corresponding unit of area is the square millimetre and a corresponding unit of volume is the cubic millimetre.

## ››Definition: Megameter

A megametre (American spelling: megameter, symbol: Mm) is a unit of length equal to 10^6 metres (from the Greek words megas = big and metro = count/measure). Its customary equivalent is 621.37 miles.

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