Convert US Survey Foot to Inch
Convert us survey feet to inches instantly. 1 us survey foot = 12.000024 inch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Inch 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.
Inch
An inch is an Imperial and US customary unit of length defined since 1959 as exactly 25.4 millimeters (0.0254 meters). It is still the standard small unit of length in the United States, the United Kingdom (informally), and a few other countries.
The inch derives from the Roman uncia (one-twelfth of a foot) and survived through Anglo-Saxon and medieval English measurement systems. Various definitions persisted regionally until the 1959 International Yard and Pound Agreement standardized the inch globally as exactly 25.4 mm.
Inches are used in the US and UK for body height, screen sizes (TVs, monitors, phones), tire sizes, plumbing, lumber, paper sizes (US Letter is 8.5 × 11 in), and most consumer product specifications in the United States.
Anglo-Saxon origin (predating 1066); standardized to 25.4 mm exactly by the International Yard and Pound Agreement of 1959, signed by the US, UK, Canada, Australia, New Zealand, and South Africa.
US Survey Foot to Inch 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 inches:
To convert us survey feet to inches, multiply the value in us survey feet by 12.000024. To reverse, multiply inches by 0.0833331667.
How to use this converter
Type a value into the calculator. The result in inches updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Inch to US Survey Foot converter for the reverse direction.
Step-by-step: convert us survey feet to inches
- Write down the value in us survey feet (sft).
- Multiply that value by the factor 12.000024.
- The product is the equivalent value in inches (in).
- To reverse, multiply the inch value by 0.0833331667.
Worked examples
Example 1 — Convert 1 sft to in:
1 × 12.000024 = 12.000024 in
Example 2 — Convert 100 sft to in:
100 × 12.000024 = 1200.0024000048 in
Real-world example — Fabric and tailoring
One us survey foot of fabric converts to a value in inches commonly used for seam allowances. Garment patterns frequently switch between the two units on a single instruction sheet.
1 sft × 12.000024 = 12.000024 in
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 inches. This is the most-used everyday length conversion in metric-using countries.
1.75 sft × 12.000024 = 21.0000420001 in
Real-world example — Pet and accessory dimensions
A 3-us survey foot dog leash equals a tidy round value in inches. Pet-supply shopping frequently mixes the two units across product specifications.
3 sft × 12.000024 = 36.0000720001 in
US Survey Foot to Inch conversion table
Standard reference values for converting us survey feet to inches:
| US Survey Foot [sft] | Inch [in] |
|---|---|
| 0.01 | 0.12000024 |
| 0.1 | 1.2000024 |
| 1 | 12.000024 |
| 2 | 24.0000480001 |
| 3 | 36.0000720001 |
| 4 | 48.0000960002 |
| 5 | 60.0001200002 |
| 10 | 120.0002400005 |
| 20 | 240.000480001 |
| 30 | 360.0007200014 |
| 40 | 480.0009600019 |
| 50 | 600.0012000024 |
| 100 | 1200.0024000048 |
| 500 | 6000.012000024 |
| 1000 | 12000.024000048 |
Frequently asked questions
How many inches is 1 us survey foot?
How do I convert us survey feet to inches?
How do I convert inches back to us survey feet?
How many inches is 100 us survey feet?
Popular length unit conversions
Convert US Survey Foot to other length units
Show all US Survey Foot conversions
Metric / SI (7 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Sources & references
Conversion factor (1 sft = 12.000024 in) 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.