Convert Millimeter to US Survey Foot
Convert millimeters to us survey feet instantly. 1 millimeter = 0.0032808333 us survey foot — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Survey Foot to Millimeter converter for the reverse conversion.
Units explained
Millimeter
A millimeter is a metric unit of length equal to one thousandth of a meter (1/1000 m). It is the standard small-scale unit in the SI system and is widely used wherever sub-centimeter precision matters.
The millimeter was defined alongside the meter when France adopted the metric system in 1795, using the standard SI prefix milli- (from Latin mille, "thousand") to denote one-thousandth.
Millimeters are used in engineering drawings, machining, manufacturing, paper sizes, rainfall measurement, and any context where dimensions below one centimeter need to be specified clearly. Most rulers worldwide are marked in millimeters.
Adopted in 1795 in France as part of the original metric system; standardized internationally by the Metre Convention in 1875 and confirmed in the SI in 1960.
US Survey Foot
The US Survey Foot is a legacy unit of length defined as exactly 1200/3937 meters (approximately 0.3048006 m). It differs from the modern international foot by about 2 parts per million.
Established in the United States by the Mendenhall Order of 1893, which defined the foot in terms of the meter as 1200/3937 m. The US continued using this value for surveying even after the 1959 International Yard and Pound Agreement standardized the international foot at exactly 0.3048 m.
Used in US land surveying, geodetic measurements, state plane coordinate systems, and legal land descriptions. The US Survey Foot was officially deprecated by NIST and NOAA effective December 31, 2022, with the international foot becoming the sole US standard. Legacy data and recorded land surveys still reference it.
Mendenhall Order of 1893 defined the foot as 1200/3937 m; persisted in US surveying after 1959; officially deprecated by NIST/NOAA as of December 31, 2022.
Millimeter to US Survey Foot conversion formula
Note: this conversion uses a generally accepted modern value. Historical and regional definitions of this unit varied across times and places.
The relationship between millimeters and us survey feet:
To convert millimeters to us survey feet, multiply the value in millimeters by 0.0032808333. To reverse, multiply us survey feet by 304.8006096012.
How to use this converter
Type a value into the calculator. The result in us survey feet updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the US Survey Foot to Millimeter converter for the reverse direction.
Step-by-step: convert millimeters to us survey feet
- Write down the value in millimeters (mm).
- Multiply that value by the factor 0.0032808333.
- The product is the equivalent value in us survey feet (sft).
- To reverse, multiply the us survey foot value by 304.8006096012.
Worked examples
Example 1 — Convert 1 mm to sft:
1 × 0.0032808333 = 0.0032808333 sft
Example 2 — Convert 100 mm to sft:
100 × 0.0032808333 = 0.3280833333 sft
Real-world example — Children's height milestones
A 150-millimeter-tall child measures a value in us survey feet that's commonly used for theme-park ride height requirements when travelling between countries that use different measurement units.
150 mm × 0.0032808333 = 0.492125 sft
Real-world example — Body height conversion
You enter your height as 180 millimeters into an international job or visa application. The form then asks for the same value in us survey feet — converting between these adjacent units is one of the most-used length conversions globally.
180 mm × 0.0032808333 = 0.59055 sft
Real-world example — Furniture and large objects
A 72-millimeter piece of furniture converts to a value in us survey feet that's easier to mentally compare with room dimensions. This is the typical workflow when shopping internationally and product specs use a different unit than your room measurements.
72 mm × 0.0032808333 = 0.23622 sft
Millimeter to US Survey Foot conversion table
Standard reference values for converting millimeters to us survey feet:
| Millimeter [mm] | US Survey Foot [sft] |
|---|---|
| 0.01 | 3.280833e-5 |
| 0.1 | 0.0003280833 |
| 1 | 0.0032808333 |
| 2 | 0.0065616667 |
| 3 | 0.0098425 |
| 4 | 0.0131233333 |
| 5 | 0.0164041667 |
| 10 | 0.0328083333 |
| 20 | 0.0656166667 |
| 30 | 0.098425 |
| 40 | 0.1312333333 |
| 50 | 0.1640416667 |
| 100 | 0.3280833333 |
| 500 | 1.6404166667 |
| 1000 | 3.2808333333 |
Frequently asked questions
How many us survey feet is 1 millimeter?
How do I convert millimeters to us survey feet?
How do I convert us survey feet back to millimeters?
How many us survey feet is 100 millimeters?
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Sources & references
Conversion factor (1 mm = 0.0032808333 sft) 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.