Convert Hand to Centiinch
Convert hands to centiinches instantly. 1 hand = 400 centiinch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Centiinch to Hand converter for the reverse conversion.
Units explained
Hand
A hand is an Imperial unit of length equal to 4 inches (101.6 mm). It is used primarily to measure the height of horses at the withers.
The hand derives from the average breadth of a human hand and was standardised at exactly 4 inches by the Statute of Henry VIII in 1541.
Hands are used worldwide for horse height specification (the typical riding horse is 14–17 hh). Also used in some equestrian-adjacent contexts. The unit is now almost exclusively a horse-measurement convention.
Standardised at 4 inches by Henry VIII in 1541; 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.
Hand to Centiinch conversion formula
The relationship between hands and centiinches:
To convert hands to centiinches, multiply the value in hands by 400. To reverse, multiply centiinches by 0.0025.
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 Hand converter for the reverse direction.
Step-by-step: convert hands to centiinches
- Write down the value in hands (hh).
- Multiply that value by the factor 400.
- The product is the equivalent value in centiinches (cin).
- To reverse, multiply the centiinch value by 0.0025.
Worked examples
Example 1 — Convert 1 hh to cin:
1 × 400 = 400 cin
Example 2 — Convert 100 hh to cin:
100 × 400 = 40000 cin
Real-world example — Sub-meter precision
A 0.001-hand (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 hh × 400 = 0.4 cin
Real-world example — Macro-to-micro scale comparison
2 hands 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 hh × 400 = 800 cin
Real-world example — Macroscopic to microscopic
One hand equals a million centiinches. Optical engineers calculating coherence length compare macro-scale path lengths with micro-scale wavelength differences using exactly this conversion.
1 hh × 400 = 400 cin
Hand to Centiinch conversion table
Standard reference values for converting hands to centiinches:
| Hand [hh] | Centiinch [cin] |
|---|---|
| 0.01 | 4 |
| 0.1 | 40 |
| 1 | 400 |
| 2 | 800 |
| 3 | 1200 |
| 4 | 1600 |
| 5 | 2000 |
| 10 | 4000 |
| 20 | 8000 |
| 30 | 12000 |
| 40 | 16000 |
| 50 | 20000 |
| 100 | 40000 |
| 500 | 200000 |
| 1000 | 400000 |
Frequently asked questions
How many centiinches is 1 hand?
How do I convert hands to centiinches?
How do I convert centiinches back to hands?
How many centiinches is 100 hands?
Popular length unit conversions
Convert Hand to other length units
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 hh = 400 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.