CM to KM Converter
Quick answer: To convert CM to KM, multiply by 0.00001. For example, 10 cm is 0.0001 km. One centimeter equals 0.00001 km.
- Calculator
- Formula
- Examples
- Size compared
- About the units
- Where used
- Step by step
- Popular conversions
- Reading your result
- Mistakes
- FAQ
- Related tools
- Method
Use the CM to KM Converter
CM to KM formula and what each symbol means
km = cm × 0.00001
| Symbol | Meaning |
|---|---|
| cm | Centimeter |
| km | Kilometer |
CM to KM examples
1 cm
1 cm × 0.00001 = 0.00001 km.
10 cm
10 cm × 0.00001 = 0.0001 km.
100 cm
100 cm × 0.00001 = 0.001 km.
CM compared with KM
One km is 100,000 times as large as one cm, so your number gets smaller when you convert CM to KM and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.
About CM and KM
Centimeter (cm): One hundredth of a metre. Kilometer (km): 1,000 metres, used for road distances in most countries.
Where CM to KM conversions are used
Road distances and maps use kilometres or miles, while building plans use metres, millimetres or feet. Screen sizes, tyres and clothing are usually given in inches, and body measurements in centimetres or inches.
How to calculate CM to KM step by step
- Enter the value in cm (the starting unit).
- Multiply by 0.00001, because 1 cm = 0.00001 km.
- The product is the value in km. To go back, divide by 0.00001 or multiply by 100,000.
Popular length conversions
How to read your CM to KM result
Between metric and imperial, the key fact is that 1 inch is exactly 2.54 cm, which makes 1 foot exactly 0.3048 m, 1 yard exactly 0.9144 m and 1 mile exactly 1,609.344 m.
| CM | KM |
|---|---|
| 1 | 0.00001 |
| 2 | 0.00002 |
| 5 | 0.00005 |
| 10 | 0.0001 |
| 20 | 0.0002 |
| 50 | 0.0005 |
| 100 | 0.001 |
| 1,000 | 0.01 |
KM to CM: quick table
| KM | CM |
|---|---|
| 1 | 100,000 |
| 5 | 500,000 |
| 10 | 1,000,000 |
| 25 | 2,500,000 |
| 50 | 5,000,000 |
| 100 | 10,000,000 |
| 250 | 25,000,000 |
| 500 | 50,000,000 |
Common mistakes when calculating CM to KM
- Mixing the international foot with the older US survey foot: the difference is about 2 parts per million and only matters in large land surveys.
- Dividing when you should multiply: from cm to km multiply by 0.00001; from km to cm divide by 0.00001.
CM to KM FAQ
How many km are in 1 cm?
1 cm equals 0.00001 km.
How many cm are in 1 km?
1 km equals 100,000 cm.
Is 1 cm = 0.00001 km an exact conversion?
Yes. The centimeter and the kilometer are both defined exactly in SI terms, so the ratio has no measurement uncertainty; 0.00001 is just that ratio shown to 7 significant figures.
What is a kilometer (km)?
1,000 metres, used for road distances in most countries.
How can I estimate CM to KM in my head?
One km is 100,000 times as large as one cm, so your number gets smaller when you convert CM to KM and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.
What is 12 cm in KM?
12 cm = 0.00012 km (since 12 × 0.00001).
What is 60 cm in KM?
60 cm = 0.0006 km (since 60 × 0.00001).
What is 250 cm in KM?
250 cm = 0.0025 km (since 250 × 0.00001).
How many decimals should I keep when converting cm to km?
Match the precision of your original measurement. For example, 0.0001 km rounds to 0.0001 km at 3 significant figures; keep more digits only for engineering or scientific work.
More in Length converters
- CM to MM Converter
- Yards to MM Converter
- CM to Yards Converter
- Yards to Miles Converter
- Feet to CM Converter
- Yards to Meters Converter
See all length converters tools · All Conversion calculators · Site map
Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the SI base units