# ››Convert kilometre to millimetre

 km mm

 Did you mean to convert km to megametre millimetre

How many km in 1 mm? The answer is 1.0E-6.
We assume you are converting between kilometre and millimetre.
You can view more details on each measurement unit:
km or mm
The SI base unit for length is the metre.
1 metre is equal to 0.001 km, or 1000 mm.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between kilometres and millimetres.
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# ››Definition: Kilometer

A kilometre (American spelling: kilometer, symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). It is approximately equal to 0.621 miles, 1094 yards or 3281 feet.

# ››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.

# ››Metric conversions and more

ConvertUnits.com provides an online conversion calculator for all types of measurement units. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. Examples include mm, inch, 100 kg, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!