Convert Hand to Caliber
Convert hands to calibers instantly. 1 hand = 400 caliber — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Caliber 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.
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.
Hand to Caliber conversion formula
The relationship between hands and calibers:
To convert hands to calibers, multiply the value in hands by 400. To reverse, multiply calibers by 0.0025.
How to use this converter
Type a value into the calculator. The result in calibers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Caliber to Hand converter for the reverse direction.
Step-by-step: convert hands to calibers
- Write down the value in hands (hh).
- Multiply that value by the factor 400.
- The product is the equivalent value in calibers (cl).
- To reverse, multiply the caliber value by 0.0025.
Worked examples
Example 1 — Convert 1 hh to cl:
1 × 400 = 400 cl
Example 2 — Convert 100 hh to cl:
100 × 400 = 40000 cl
Real-world example — Macroscopic to microscopic
One hand equals a million calibers. Optical engineers calculating coherence length compare macro-scale path lengths with micro-scale wavelength differences using exactly this conversion.
1 hh × 400 = 400 cl
Real-world example — Sub-meter precision
A 0.001-hand (1 mm) tolerance equals 1,000 calibers — 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 cl
Real-world example — Macro-to-micro scale comparison
2 hands of measurement converts to a very large number in calibers — useful in materials science when comparing bulk-sample dimensions to feature-level surface specs.
2 hh × 400 = 800 cl
Hand to Caliber conversion table
Standard reference values for converting hands to calibers:
| Hand [hh] | Caliber [cl] |
|---|---|
| 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 calibers is 1 hand?
How do I convert hands to calibers?
How do I convert calibers back to hands?
How many calibers 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 cl) 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.