ft-us to m | Convert US Survey Foot to Meter

US Survey Foot to Meter Conversion Formula Example What is a US Survey Foot (ft-us)?Where Did the US Survey Foot Come From?Why Was the US Survey Foot Replaced?Why Did This Small Difference Cause Big Problems?What is a Meter (m)?How Was the Meter Originally Defined?The Modern Definition: Based on the Speed of Light Why the Meter is a Foundational Unit What is the imperial system?What is the metric system?US Survey Foot to Meter Conversion Table

US Survey Foot to Meter Conversion Formula

To convert from US Survey Foot (ft-us) to Meter (m), use the following formula:

$\textbf{ Meter} \text{ (m)}$

$= 1.000002 \times \frac{1}{3.28084}\times \textbf{ US Survey Foot} \text{ (ft-us)}$

$= 0.30480059984638080492\times \textbf{ US Survey Foot} \text{ (ft-us)}$

With $\frac{1}{3.28084}$ is the ratio between the base units Meter (m) and Foot (ft).

Example

Let's convert 5 US Survey Foot (ft-us) to Meter (m).

Using the formula:

$5 \times 0.30480059984638080492 = 1.5240029992319040246$

Therefore, 5 US Survey Foot (ft-us) is equal to $1.5240029992319040246$ Meter (m).

What is a US Survey Foot (ft-us)?

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.

Where Did the US Survey Foot Come From?

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.

Why Was the US Survey Foot Replaced?

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.

Why Did This Small Difference Cause Big Problems?

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.

What is a Meter (m)?

The meter (m) is the foundational unit of length in the metric system, a standard of measurement used worldwide.

Simply put, it's used to measure the distance or separation between things.

The plural form is meters.

How Was the Meter Originally Defined?

The original definition of the meter dates back to 1793.

The French Academy of Sciences established it as exactly one ten-millionth (1/10,000,000) of the distance from the North Pole to the Equator (measured along a line passing through Paris).

This ambitious goal was to create a universal unit based on a natural feature of the Earth itself.

The Modern Definition: Based on the Speed of Light

Today, the modern definition is far more precise and is based on a universal constant: the speed of light.

Since 1983, the meter has been officially defined as the distance that light travels in a vacuum in exactly 1/299,792,458 of a second.

This modern definition ensures that the meter is incredibly stable and can be accurately reproduced in any lab around the world.

Why the Meter is a Foundational Unit

As one of the seven base units in the International System of Units (SI), the meter is essential for calculating many other derived units.

For example, the meter is used to measure:

Area in square meters (m²)
Volume in cubic meters (m³)
Speed in meters per second (m/s)

The meter serves as a fundamental unit in scientific and engineering measurements worldwide.

What is the imperial system?

The imperial system is a system of measurement that was first defined in the British Weights and Measures Act of 1824. It's known for using units like inches, feet, pounds, and gallons. While most of the world now uses the metric system, the imperial system remains the official system of measurement in the United States and is still used in specific contexts in other countries, such as the United Kingdom and Canada.

What is the metric system?

The metric system is a decimal-based system of measurement used by nearly every country in the world. Its key feature is the use of prefixes to denote multiples and submultiples of the base units by powers of ten.

US Survey Foot to Meter Conversion Table

Here are some quick reference conversions from US Survey Foot (ft-us) to Meter (m):

US Survey Feet	Meters
0.000001 ft-us	$3.0480059984638080492\times 10^{-7}$ m
0.001 ft-us	$0.00030480059984638080492$ m
0.1 ft-us	$0.030480059984638080492$ m
1 ft-us	$0.30480059984638080492$ m
2 ft-us	$0.60960119969276160984$ m
3 ft-us	$0.91440179953914241476$ m
4 ft-us	$1.2192023993855232197$ m
5 ft-us	$1.5240029992319040246$ m
6 ft-us	$1.8288035990782848295$ m
7 ft-us	$2.1336041989246656344$ m
8 ft-us	$2.4384047987710464394$ m
9 ft-us	$2.7432053986174272443$ m
10 ft-us	$3.0480059984638080492$ m
20 ft-us	$6.0960119969276160984$ m
30 ft-us	$9.1440179953914241476$ m
40 ft-us	$12.192023993855232197$ m
50 ft-us	$15.240029992319040246$ m
100 ft-us	$30.480059984638080492$ m
1000 ft-us	$304.80059984638080492$ m
10000 ft-us	$3048.0059984638080492$ m

Convert Length from Us Survey Foot to Meter (ft-us to m)

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