How many mm in 1 gigameter?
The answer is 1000000000000.
We assume you are converting between millimetre and gigametre.
You can view more details on each measurement unit: mm or
gigameter
The SI base unit for length is the metre.
1 metre is equal to 1000 mm, or 1.0E-9 gigameter.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between millimetres and gigameters.
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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: Gigameter

A gigametre (American spelling: gigameter, symbol: Gm) is a unit of length equal to 10^9 metres. Its customary equivalent is 621,371 miles.

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