Convert Hectometer to Kilometer
Convert hectometers to kilometers instantly. 1 hectometer = 0.1 kilometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Kilometer to Hectometer converter for the reverse conversion.
Units explained
Hectometer
A hectometer is a metric unit of length equal to one hundred meters (100 m). It is occasionally used in sports, agricultural surveying, and some European real-estate contexts.
The hectometer was defined alongside the meter when France adopted the metric system in 1795, using the SI prefix hecto- (from Greek hekaton, hundred) to denote multiplication by 100.
Hectometers appear in some sports contexts (the 100 m sprint is technically 1 hm), in agriculture (parcel sizes in some European nations), and in atmospheric science. Most contexts now use meters or kilometers instead.
Adopted in 1795 in France; ratified through the Metre Convention of 1875; remains a defined SI prefix unit although rarely used outside specialised contexts.
Kilometer
A kilometer is a metric unit of length equal to one thousand meters. It is the standard unit for measuring road distances, geographic distances, and other large-scale measurements in metric countries.
The kilometer was defined alongside the meter in 1795 using the standard SI prefix kilo- (from Greek chilioi, "thousand"), denoting one thousand units.
Kilometers are used worldwide (except the United States and a few others) for road signage, geographic distance, athletic events, and scientific distances at planetary scale. Speed limits in most countries are given in km/h.
Adopted 1795 in France as part of the original metric system; the kilometer became the global standard for road and geographic distance through the 19th and 20th century metric adoption.
Hectometer to Kilometer conversion formula
The relationship between hectometers and kilometers:
To convert hectometers to kilometers, multiply the value in hectometers by 0.1. To reverse, multiply kilometers by 10.
How to use this converter
Type a value into the calculator. The result in kilometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Kilometer to Hectometer converter for the reverse direction.
Step-by-step: convert hectometers to kilometers
- Write down the value in hectometers (hm).
- Multiply that value by the factor 0.1.
- The product is the equivalent value in kilometers (km).
- To reverse, multiply the kilometer value by 10.
Worked examples
Example 1 — Convert 1 hm to km:
1 × 0.1 = 0.1 km
Example 2 — Convert 100 hm to km:
100 × 0.1 = 10 km
Hectometer to Kilometer conversion table
Standard reference values for converting hectometers to kilometers:
| Hectometer [hm] | Kilometer [km] |
|---|---|
| 0.01 | 0.001 |
| 0.1 | 0.01 |
| 1 | 0.1 |
| 2 | 0.2 |
| 3 | 0.3 |
| 4 | 0.4 |
| 5 | 0.5 |
| 10 | 1 |
| 20 | 2 |
| 30 | 3 |
| 40 | 4 |
| 50 | 5 |
| 100 | 10 |
| 500 | 50 |
| 1000 | 100 |
Frequently asked questions
How many kilometers is 1 hectometer?
How do I convert hectometers to kilometers?
How do I convert kilometers back to hectometers?
How many kilometers is 100 hectometers?
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Metric / SI (17 units)
Imperial / US Customary (4 units)
Sources & references
Conversion factor (1 hm = 0.1 km) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.