Convert Caliber to US Survey Foot
Convert calibers to us survey feet instantly. 1 caliber = 0.0008333317 us survey foot — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Survey Foot to Caliber converter for the reverse conversion.
Units explained
Caliber
In length-measurement context, a caliber is a unit equal to one hundredth of an inch (2.54×10⁻⁴ m). The same word also refers to a firearm's bore diameter; in that context the value depends on the specific cartridge.
The caliber as a length unit derives from the inch by hundredth subdivision. Standardised through the 1959 International Yard and Pound Agreement.
Calibers appear in ballistics literature (alongside the more common usage as bore diameter), historical small-arms specifications, and a few precision-engineering contexts. Often confused with the cartridge-naming caliber, which is a different concept.
Length-unit usage standardised through the 1959 International Yard and Pound Agreement; the bore-diameter usage long predates this.
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.
Caliber 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 calibers and us survey feet:
To convert calibers to us survey feet, multiply the value in calibers by 0.0008333317. To reverse, multiply us survey feet by 1200.0024000048.
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 Caliber converter for the reverse direction.
Step-by-step: convert calibers to us survey feet
- Write down the value in calibers (cl).
- Multiply that value by the factor 0.0008333317.
- The product is the equivalent value in us survey feet (sft).
- To reverse, multiply the us survey foot value by 1200.0024000048.
Worked examples
Example 1 — Convert 1 cl to sft:
1 × 0.0008333317 = 0.0008333317 sft
Example 2 — Convert 100 cl to sft:
100 × 0.0008333317 = 0.0833331667 sft
Real-world example — From microscopic to macroscopic
A million calibers equals exactly one us survey foot. This kind of conversion appears in microfluidics, where total channel length is given in us survey feet but feature widths are in calibers.
1000000 cl × 0.0008333317 = 833.3316666667 sft
Real-world example — Macro-scale buildup
A million calibers equals exactly one us survey foot — the conversion that bridges microscale features and macroscale objects in microfluidic, biomedical, and semiconductor packaging design.
1000000 cl × 0.0008333317 = 833.3316666667 sft
Real-world example — Quarter-meter measurement reference
A 250,000-caliber length equals 0.25 us survey feet — useful for comparing supply-chain spec sheets where some lengths are quoted in the smaller unit and some in the larger.
250000 cl × 0.0008333317 = 208.3329166667 sft
Caliber to US Survey Foot conversion table
Standard reference values for converting calibers to us survey feet:
| Caliber [cl] | US Survey Foot [sft] |
|---|---|
| 0.01 | 8.333317e-6 |
| 0.1 | 8.333317e-5 |
| 1 | 0.0008333317 |
| 2 | 0.0016666633 |
| 3 | 0.002499995 |
| 4 | 0.0033333267 |
| 5 | 0.0041666583 |
| 10 | 0.0083333167 |
| 20 | 0.0166666333 |
| 30 | 0.02499995 |
| 40 | 0.0333332667 |
| 50 | 0.0416665833 |
| 100 | 0.0833331667 |
| 500 | 0.4166658333 |
| 1000 | 0.8333316667 |
Frequently asked questions
How many us survey feet is 1 caliber?
How do I convert calibers to us survey feet?
How do I convert us survey feet back to calibers?
How many us survey feet is 100 calibers?
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Sources & references
Conversion factor (1 cl = 0.0008333317 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.