The US survey foot is 1200/3937 meters and is retained for legacy land records.
US survey feet to Millimeters Converter — ftUS to mm
Convert US survey foot (ftUS) to Millimeter (mm) using the exact conversion factor (1 us survey foot = 304.8006096 millimeter). See the formula, worked examples, conversion table, history, and common uses.
US survey feet to Millimeters converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
Millimeter is 0.001 meter units.
Result = input x 0.3048006096 / 0.001.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting US survey feet to Millimeters
US survey foot and Millimeter both measure length. Specifically: The US survey foot is 1200/3937 meters and is retained for legacy land records, and millimeter is 0.001 meter units.
Formula
millimeters = us survey feet × 304.800609601
This factor comes from each unit's defined relationship to the category's base unit: 1 us survey foot equals 0.304800609601 base units, and 1 millimeter equals 0.001 base units, so dividing one by the other gives the direct us survey foot-to-millimeter factor of 304.800609601.
Simple example
1 ftUS × 304.8006096 = 304.8006096 mm
1 us survey foot = 304.8006096 millimeters.
Real-world example
10 ftUS × 304.8006096 = 3,048.006096 mm
10 us survey feet = 3,048.006096 millimeters.
Conversion table
| US survey foot (ftUS) | Millimeter (mm) |
|---|---|
| 1 ftUS | 304.8006096 mm |
| 5 ftUS | 1,524.003048 mm |
| 10 ftUS | 3,048.006096 mm |
| 21.0975 ftUS | 6,430.530861 mm |
| 42.195 ftUS | 12,861.06172 mm |
| 100 ftUS | 30,480.06096 mm |
Reverse conversion: Millimeter to US survey foot
304.8006096 mm × 0.003280833333 = 1 ftUS
304.8006096 millimeters = 1 us survey feet.
us survey feet = millimeters × 0.00328083333333
For a page dedicated to this direction, see Millimeter to US survey foot.
Understanding the US survey foot (ftUS)
The US survey foot is 1200/3937 meters and is retained for legacy land records.
Understanding the Millimeter
Millimeter (mm) measures distance. A millimeter is one-thousandth of a meter. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard small/precision length unit worldwide, including in US engineering and manufacturing
Uses of the Millimeter today
- Engineering drawings and manufacturing tolerances worldwide (including in the US)
- Rainfall measurement in most countries
- Small-scale everyday measurement (screen sizes, hardware)
History of the Millimeter
The millimeter follows from the meter via the 'milli-' SI prefix (10⁻³). It is notable as one of the few metric units in routine US technical/engineering use, since precision manufacturing and electronics are often specified in millimeters even in the US.
Historical origin. Millimeter was not the invention of a single named person; it developed through the process described above.
Millimeter — sources
- BIPM SI Brochure — SI prefixes — Defines 'milli-' as the prefix for 10⁻³.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many millimeters are in 1 us survey foot?
1 us survey foot equals 304.8006096 millimeters, using the exact defined conversion factor rather than an estimate.
How do I convert us survey foot to millimeter?
Multiply the us survey foot value by 304.8006096. The converter above does this instantly to whatever precision you set.
How do I convert millimeter back to us survey foot?
Use the reverse factor: 1 millimeter equals 0.0032808333 us survey feet. You can also use the swap control in the converter above to flip the direction instantly.
What is a us survey foot?
US survey foot (ftUS) is a unit of length.
What is a millimeter?
Millimeter (mm) measures distance. A millimeter is one-thousandth of a meter. It is classified as a SI derived (metric prefix) unit.
Is the us survey foot to millimeter conversion exact?
Yes. Both us survey foot and millimeter are defined by fixed standards rather than physical artifacts, so the factor of 304.8006096 used above is exact to as many digits as you choose to display.