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To convert from US Survey Foot (ft-us) to Kilometer (km), use the following formula:
Kilometer (km)
= 1.000002 × 0.3048 × 11000× US Survey Foot (ft-us)
= 0.0003048006096× US Survey Foot (ft-us)
With 0.3048 is the ratio between the base units Meter (m) and Foot (ft).
Let's convert 5 US Survey Foot (ft-us) to Kilometer (km).
Using the formula:
5 × 0.0003048006096 = 0.001524003048
Therefore, 5 US Survey Foot (ft-us) is equal to 0.001524003048 Kilometer (km).
How many us survey feet are in one kilometer? One Kilometer (km) contains 3280.8333333464566667 US Survey Feet (ft-us) — the inverse of the factor above. Multiplying by 0.0003048006096 takes you from us survey feet to kilometers; multiplying by 3280.8333333464566667 brings you back.
Put in words: one us survey foot equals 0.0003048006096 kilometers, so the us survey foot is the smaller unit of this pair. Converting between them never changes the amount of length being measured — only the size of the unit you count it in.
The US Survey Foot is a unit of length historically used for land surveying in the United States.
It is very close in length to the international foot, equaling approximately 1.000002 international feet (ft). The plural form is US Survey Feet.
The origin of the US Survey Foot dates back to the Mendenhall Order of 1893. This order defined the relationship between the meter and US customary units.
It established that 1 meter is precisely equal to 39.37 inches. From this relationship, the US Survey Foot was derived, defined as 1200/3937 meters.
This definition differs slightly from the international foot, which was established in 1959 and is defined as exactly 0.3048 meters.
To simplify measurements and prevent confusion, the National Institute of Standards and Technology (NIST) and the National Geodetic Survey (NGS) made a critical change.
They officially retired the U.S. Survey Foot on December 31, 2022.
Surveying and mapping applications in the United States will now use the international foot. This critical change helps unify the National Spatial Reference System (NSRS) and prevents costly errors in large-scale projects.
While the difference between a US Survey Foot and an international foot is minuscule—only about two parts per million—it becomes significant over large distances.
For every mile, the discrepancy adds up to approximately 1/8 inch.
This minor error may not be significant for a backyard fence. However, for massive construction projects and infrastructure development, such as bridges that cross state lines, the accumulated error can lead to severe misalignments and costly mistakes.
A kilometer (km) is a unit of length in the metric system, equal to 1,000 meters.
The plural form is kilometers.
The term "kilometer" is composed of two parts: the metric unit "meter" and the Greek prefix "kilo," which comes from the word "khilioi," meaning "thousand."
Thus, a kilometer translates to one thousand meters.
This concept is a fundamental aspect of the decimal-based metric system, established in France during the 1790s. The logical, prefix-based nature of the metric system simplifies conversions, which is a key reason for its widespread adoption.
The kilometer is the official unit of measurement for geographical distance in the vast majority of countries worldwide.
Only a few nations still primarily use the mile for road signage and navigation, most notably:
For international travel, science, and sporting events like marathons and the Olympics, the kilometer is the universally accepted standard.
To understand how far a kilometer is, consider these real-world examples:
This consistent unit of measurement makes it easy to compare everything from everyday travel to distances in space.
Here are some quick reference conversions from US Survey Foot (ft-us) to Kilometer (km):
| US Survey Feet | Kilometers |
|---|---|
| 0.000001 ft-us | 3.048006096× 10-10 km |
| 0.001 ft-us | 3.048006096× 10-7 km |
| 0.1 ft-us | 0.00003048006096 km |
| 1 ft-us | 0.0003048006096 km |
| 2 ft-us | 0.0006096012192 km |
| 3 ft-us | 0.0009144018288 km |
| 4 ft-us | 0.0012192024384 km |
| 5 ft-us | 0.001524003048 km |
| 6 ft-us | 0.0018288036576 km |
| 7 ft-us | 0.0021336042672 km |
| 8 ft-us | 0.0024384048768 km |
| 9 ft-us | 0.0027432054864 km |
| 10 ft-us | 0.003048006096 km |
| 20 ft-us | 0.006096012192 km |
| 30 ft-us | 0.009144018288 km |
| 40 ft-us | 0.012192024384 km |
| 50 ft-us | 0.01524003048 km |
| 100 ft-us | 0.03048006096 km |
| 1000 ft-us | 0.3048006096 km |
| 10000 ft-us | 3.048006096 km |
For all Length converters, choose units using the From/To dropdowns above.