Length and Area
kmtocm
Convert kilometres (km) to centimetres (cm).
Factor1 km = 100000 cm
Converter
km
Accepts numbers or expressions, e.g. 150 + 14.7
Result
cm
Rendered to 6 significant figures.
Formula
Formula
cm = km × 100000
Multiply any value in kilometres by 100000 to obtain the value in centimetres.
Worked example
Convert 1 km to cm.
- 01Start with 1 km.
- 02Multiply by the conversion factor: 1 × 100000 = 100000 cm.
Result1 km = 100000 cm
Conversion table
| km | cm |
|---|---|
| 1 | 1.0000e+5 |
| 2 | 2.0000e+5 |
| 5 | 5.0000e+5 |
| 10 | 1.0000e+6 |
| 20 | 2.0000e+6 |
| 50 | 5.0000e+6 |
| 100 | 1e+7 |
| 200 | 2e+7 |
| 500 | 5e+7 |
| 1000 | 1e+8 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from km to cm?
1 km equals 100000 cm. To convert, multiply the value in kilometres by 100000.
How do I convert 1 km to cm?
1 km = 100000 cm. For any value, multiply by 100000.
How do I convert cm back to km?
Divide by the same factor — or equivalently, multiply by 1e-5. So 1 cm = 1e-5 km.
When would I need to convert kilometre to centimetre?
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 km and cm are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).