Convert US Survey Foot to Millimeter
Convert us survey feet to millimeters instantly. 1 us survey foot = 304.8006096012 millimeter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Millimeter to US Survey Foot converter for the reverse conversion.
Units explained
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
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 to Millimeter 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 us survey feet and millimeters:
To convert us survey feet to millimeters, multiply the value in us survey feet by 304.8006096012. To reverse, multiply millimeters by 0.0032808333.
How to use this converter
Type a value into the calculator. The result in millimeters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Millimeter to US Survey Foot converter for the reverse direction.
Step-by-step: convert us survey feet to millimeters
- Write down the value in us survey feet (sft).
- Multiply that value by the factor 304.8006096012.
- The product is the equivalent value in millimeters (mm).
- To reverse, multiply the millimeter value by 0.0032808333.
Worked examples
Example 1 — Convert 1 sft to mm:
1 × 304.8006096012 = 304.8006096012 mm
Example 2 — Convert 100 sft to mm:
100 × 304.8006096012 = 30480.0609601219 mm
Real-world example — Pet and accessory dimensions
A 3-us survey foot dog leash equals a tidy round value in millimeters. Pet-supply shopping frequently mixes the two units across product specifications.
3 sft × 304.8006096012 = 914.4018288037 mm
Real-world example — Fabric and tailoring
One us survey foot of fabric converts to a value in millimeters commonly used for seam allowances. Garment patterns frequently switch between the two units on a single instruction sheet.
1 sft × 304.8006096012 = 304.8006096012 mm
Real-world example — Body height conversion (reverse direction)
You measure 1.75 us survey feet tall and need to fill in a gym membership form or medical record that asks for height in millimeters. This is the most-used everyday length conversion in metric-using countries.
1.75 sft × 304.8006096012 = 533.4010668021 mm
US Survey Foot to Millimeter conversion table
Standard reference values for converting us survey feet to millimeters:
| US Survey Foot [sft] | Millimeter [mm] |
|---|---|
| 0.01 | 3.048006096 |
| 0.1 | 30.4800609601 |
| 1 | 304.8006096012 |
| 2 | 609.6012192024 |
| 3 | 914.4018288037 |
| 4 | 1219.2024384049 |
| 5 | 1524.0030480061 |
| 10 | 3048.0060960122 |
| 20 | 6096.0121920244 |
| 30 | 9144.0182880366 |
| 40 | 12192.0243840488 |
| 50 | 15240.030480061 |
| 100 | 30480.0609601219 |
| 500 | 152400.3048006096 |
| 1000 | 304800.6096012192 |
Frequently asked questions
How many millimeters is 1 us survey foot?
How do I convert us survey feet to millimeters?
How do I convert millimeters back to us survey feet?
How many millimeters is 100 us survey feet?
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Metric / SI (7 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Sources & references
Conversion factor (1 sft = 304.8006096012 mm) 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.