Convert US Survey Foot to Centiinch
Convert us survey feet to centiinches instantly. 1 us survey foot = 1200.0024000048 centiinch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Centiinch 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.
Centiinch
A centiinch is an Imperial unit of length equal to one hundredth of an inch (2.54×10⁻⁴ m). It is functionally identical to the caliber as a length unit but appears in different industrial contexts.
Derived from the inch via the metric-style prefix centi- (Latin centum, hundred). Standardised through the 1959 International Yard and Pound Agreement.
Centiinches occasionally appear in older engineering specifications and US-localised metric-pseudo notation. Most contemporary use prefers thousandths (mils) for sub-inch precision.
Standardised through the 1959 International Yard and Pound Agreement; rarely used in modern practice.
US Survey Foot to Centiinch 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 centiinches:
To convert us survey feet to centiinches, multiply the value in us survey feet by 1200.0024000048. To reverse, multiply centiinches by 0.0008333317.
How to use this converter
Type a value into the calculator. The result in centiinches updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Centiinch to US Survey Foot converter for the reverse direction.
Step-by-step: convert us survey feet to centiinches
- Write down the value in us survey feet (sft).
- Multiply that value by the factor 1200.0024000048.
- The product is the equivalent value in centiinches (cin).
- To reverse, multiply the centiinch value by 0.0008333317.
Worked examples
Example 1 — Convert 1 sft to cin:
1 × 1200.0024000048 = 1200.0024000048 cin
Example 2 — Convert 100 sft to cin:
100 × 1200.0024000048 = 120000.24000048 cin
Real-world example — Sub-meter precision
A 0.001-us survey foot (1 mm) tolerance equals 1,000 centiinches — useful for surface-finish specs, where macro-scale dimensions are given in the larger unit but feature roughness in the smaller.
0.001 sft × 1200.0024000048 = 1.2000024 cin
Real-world example — Macro-to-micro scale comparison
2 us survey feet of measurement converts to a very large number in centiinches — useful in materials science when comparing bulk-sample dimensions to feature-level surface specs.
2 sft × 1200.0024000048 = 2400.0048000096 cin
Real-world example — Macroscopic to microscopic
One us survey foot equals a million centiinches. Optical engineers calculating coherence length compare macro-scale path lengths with micro-scale wavelength differences using exactly this conversion.
1 sft × 1200.0024000048 = 1200.0024000048 cin
US Survey Foot to Centiinch conversion table
Standard reference values for converting us survey feet to centiinches:
| US Survey Foot [sft] | Centiinch [cin] |
|---|---|
| 0.01 | 12.000024 |
| 0.1 | 120.0002400005 |
| 1 | 1200.0024000048 |
| 2 | 2400.0048000096 |
| 3 | 3600.0072000144 |
| 4 | 4800.0096000192 |
| 5 | 6000.012000024 |
| 10 | 12000.024000048 |
| 20 | 24000.048000096 |
| 30 | 36000.072000144 |
| 40 | 48000.096000192 |
| 50 | 60000.12000024 |
| 100 | 120000.24000048 |
| 500 | 600001.2000024001 |
| 1000 | 1200002.4000048002 |
Frequently asked questions
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Metric / SI (7 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Sources & references
Conversion factor (1 sft = 1200.0024000048 cin) 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.