Convert Caliber to Microinch
Convert calibers to microinches instantly. 1 caliber = 10000 microinch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Microinch 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.
Microinch
A microinch is an Imperial unit of length equal to one millionth of an inch (2.54×10⁻⁸ m). It is used almost exclusively in surface-finish specifications for precision machining and optical components.
The microinch is derived from the inch using the SI-style prefix micro- to denote one millionth. Standardised through the 1959 International Yard and Pound Agreement, which fixed the inch at exactly 25.4 mm.
Microinches express surface roughness (Ra values) in US-based precision manufacturing — typical machined surfaces are 16–125 µin. Optical components and bearing races are often specified to 1–4 µin Ra.
Used in US precision-manufacturing literature throughout the 20th century; value became exact in 1959 when the inch was fixed at 25.4 mm via the International Yard and Pound Agreement.
Caliber to Microinch conversion formula
The relationship between calibers and microinches:
To convert calibers to microinches, multiply the value in calibers by 10000. To reverse, multiply microinches by 0.0001.
How to use this converter
Type a value into the calculator. The result in microinches updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Microinch to Caliber converter for the reverse direction.
Step-by-step: convert calibers to microinches
- Write down the value in calibers (cl).
- Multiply that value by the factor 10000.
- The product is the equivalent value in microinches (µin).
- To reverse, multiply the microinch value by 0.0001.
Worked examples
Example 1 — Convert 1 cl to µin:
1 × 10000 = 10000 µin
Example 2 — Convert 100 cl to µin:
100 × 10000 = 1000000 µin
Real-world example — Infrared to visible-spectrum mapping
A 10-caliber thermal infrared wavelength corresponds to a much larger number in microinches, the unit favoured for ultraviolet and visible-light specifications.
10 cl × 10000 = 100000 µin
Real-world example — Mid-micron to nanometer
3 calibers equals 3,000 microinches — useful when relating mid-infrared wavelengths (typically quoted in microns) to nanometer-scale visible-light wavelength tables.
3 cl × 10000 = 30000 µin
Real-world example — From microns to sub-micron features
One caliber equals one thousand microinches — the conversion semiconductor designers do constantly when comparing mask feature dimensions to actual transistor gate lengths.
1 cl × 10000 = 10000 µin
Caliber to Microinch conversion table
Standard reference values for converting calibers to microinches:
| Caliber [cl] | Microinch [µin] |
|---|---|
| 0.01 | 100 |
| 0.1 | 1000 |
| 1 | 10000 |
| 2 | 20000 |
| 3 | 30000 |
| 4 | 40000 |
| 5 | 50000 |
| 10 | 100000 |
| 20 | 200000 |
| 30 | 300000 |
| 40 | 400000 |
| 50 | 500000 |
| 100 | 1000000 |
| 500 | 5000000 |
| 1000 | 1e+7 |
Frequently asked questions
How many microinches is 1 caliber?
How do I convert calibers to microinches?
How do I convert microinches back to calibers?
How many microinches is 100 calibers?
Popular length unit conversions
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 cl = 10000 µin) 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.