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Length and Area

cmtokm

Convert centimetres (cm) to kilometres (km).

Factor1 cm = 1e-5 km

Converter

cm

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1km

Rendered to 6 significant figures.

Formula

Formula
km = cm × 1e-5

Multiply any value in centimetres by 1e-5 to obtain the value in kilometres.

Worked example

Convert 100000 cm to km.

  1. 01Start with 100000 cm.
  2. 02Multiply by the conversion factor: 100000 × 1e-5 = 1 km.
Result100000 cm = 1 km

Conversion table

cmkm
11e-5
22e-5
55e-5
100.0001
200.0002
500.0005
1000.001
2000.002
5000.005
10000.01

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from cm to km?
1 cm equals 1e-5 km. To convert, multiply the value in centimetres by 1e-5.
How do I convert 1 cm to km?
1 cm = 1e-5 km. For any value, multiply by 1e-5.
How do I convert km back to cm?
Divide by the same factor — or equivalently, multiply by 100000. So 1 km = 100000 cm.
When would I need to convert centimetre to kilometre?
Length conversions appear in piping, layout, and mechanical drawings — particularly when reconciling imperial fittings or instrument lengths with metric plant drawings.
Is the conversion exact?
Yes. Both cm and km are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).

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