Convert Barleycorn to Centiinch
Convert barleycorns to centiinches instantly. 1 barleycorn = 33.3333334646 centiinch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Centiinch to Barleycorn converter for the reverse conversion.
Units explained
Barleycorn
A barleycorn is an Imperial unit of length equal to one third of an inch (about 8.47 mm). It is the basis of UK shoe sizing and is one of the oldest English length units still in use.
The barleycorn derives from the average length of a grain of barley as a natural reference. Standardised at exactly 1/3 inch by the Statute of Edward II in 1324, which used three barleycorns to define an inch.
Barleycorns are the foundation of UK and US children's shoe sizing — each whole size differs by one barleycorn. Also occasionally referenced in horse-handling and historical English literature.
Standardised in 1324 by the Statute of Edward II at 1/3 inch; the value became exact in 1959 when the inch was fixed at 25.4 mm.
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.
Barleycorn to Centiinch conversion formula
The relationship between barleycorns and centiinches:
To convert barleycorns to centiinches, multiply the value in barleycorns by 33.3333334646. To reverse, multiply centiinches by 0.0299999999.
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 Barleycorn converter for the reverse direction.
Step-by-step: convert barleycorns to centiinches
- Write down the value in barleycorns (barleycorn).
- Multiply that value by the factor 33.3333334646.
- The product is the equivalent value in centiinches (cin).
- To reverse, multiply the centiinch value by 0.0299999999.
Worked examples
Example 1 — Convert 1 barleycorn to cin:
1 × 33.3333334646 = 33.3333334646 cin
Example 2 — Convert 100 barleycorn to cin:
100 × 33.3333334646 = 3333.3333464567 cin
Real-world example — Adjacent small-scale precision
One barleycorn equals 1,000 centiinches — the standard sub-millimeter precision conversion that materials engineers use whenever they switch between bulk material thickness specs (larger unit) and surface-finish characteristics (smaller unit).
1 barleycorn × 33.3333334646 = 33.3333334646 cin
Real-world example — Adjacent metric sub-units
One barleycorn equals 1,000 centiinches. Engineers move between these scales constantly: PCB feature sizes in the larger unit, wire-bond diameters in the smaller.
1 barleycorn × 33.3333334646 = 33.3333334646 cin
Barleycorn to Centiinch conversion table
Standard reference values for converting barleycorns to centiinches:
| Barleycorn [barleycorn] | Centiinch [cin] |
|---|---|
| 0.01 | 0.3333333346 |
| 0.1 | 3.3333333465 |
| 1 | 33.3333334646 |
| 2 | 66.6666669291 |
| 3 | 100.0000003937 |
| 4 | 133.3333338583 |
| 5 | 166.6666673228 |
| 10 | 333.3333346457 |
| 20 | 666.6666692913 |
| 30 | 1000.000003937 |
| 40 | 1333.3333385827 |
| 50 | 1666.6666732283 |
| 100 | 3333.3333464567 |
| 500 | 16666.6667322835 |
| 1000 | 33333.3334645669 |
Frequently asked questions
How many centiinches is 1 barleycorn?
How do I convert barleycorns to centiinches?
How do I convert centiinches back to barleycorns?
How many centiinches is 100 barleycorns?
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 barleycorn = 33.3333334646 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.