Convert Perch to Centiinch
Convert perches to centiinches instantly. 1 perch = 19800 centiinch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Centiinch to Perch converter for the reverse conversion.
Units explained
Perch
A perch is an Imperial unit of length identical to the rod — 16.5 feet (about 5.03 m). The names 'rod', 'perch', and 'pole' all refer to the same surveying unit and differ only by regional preference.
Like the rod, the perch derives from medieval English land-surveying. The name 'perch' was particularly common in legal land descriptions in Ireland and parts of the UK.
Perches appear in legacy land descriptions in Ireland, the UK, and historical US documents. Modern usage is rare.
Medieval English surveying origin; identical to the rod since 1620; became exact via the 1959 International Yard and Pound Agreement.
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.
Perch to Centiinch conversion formula
The relationship between perches and centiinches:
To convert perches to centiinches, multiply the value in perches by 19800. To reverse, multiply centiinches by 5.050505e-5.
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 Perch converter for the reverse direction.
Step-by-step: convert perches to centiinches
- Write down the value in perches (perch).
- Multiply that value by the factor 19800.
- The product is the equivalent value in centiinches (cin).
- To reverse, multiply the centiinch value by 5.050505e-5.
Worked examples
Example 1 — Convert 1 perch to cin:
1 × 19800 = 19800 cin
Example 2 — Convert 100 perch to cin:
100 × 19800 = 1980000 cin
Real-world example — Sub-meter precision
A 0.001-perch (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 perch × 19800 = 19.8 cin
Real-world example — Macro-to-micro scale comparison
2 perches 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 perch × 19800 = 39600 cin
Real-world example — Macroscopic to microscopic
One perch equals a million centiinches. Optical engineers calculating coherence length compare macro-scale path lengths with micro-scale wavelength differences using exactly this conversion.
1 perch × 19800 = 19800 cin
Perch to Centiinch conversion table
Standard reference values for converting perches to centiinches:
| Perch [perch] | Centiinch [cin] |
|---|---|
| 0.01 | 198 |
| 0.1 | 1980 |
| 1 | 19800 |
| 2 | 39600 |
| 3 | 59400 |
| 4 | 79200 |
| 5 | 99000 |
| 10 | 198000 |
| 20 | 396000 |
| 30 | 594000 |
| 40 | 792000 |
| 50 | 990000 |
| 100 | 1980000 |
| 500 | 9900000 |
| 1000 | 1.98e+7 |
Frequently asked questions
How many centiinches is 1 perch?
How do I convert perches to centiinches?
How do I convert centiinches back to perches?
How many centiinches is 100 perches?
Popular length unit conversions
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 perch = 19800 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.