Convert Hand to Span
Convert hands to spans instantly. 1 hand = 0.4444444444 span — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Span 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.
Span
A span is an Imperial unit of length equal to 9 inches (228.6 mm). Historically, it represented the distance from the tip of an extended thumb to the tip of an extended little finger.
The span derives from this natural body-measurement and was standardised at 9 inches in English customary practice.
Spans are rare in modern commerce but appear in historical English literature, biblical translation studies, and reproduction crafts. Some construction and gardening still use 'span' informally.
Ancient body-measure origin; standardised in English customary practice at 9 inches; became exact via the 1959 International Yard and Pound Agreement.
Hand to Span conversion formula
The relationship between hands and spans:
To convert hands to spans, multiply the value in hands by 0.4444444444. To reverse, multiply spans by 2.25.
How to use this converter
Type a value into the calculator. The result in spans updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Span to Hand converter for the reverse direction.
Step-by-step: convert hands to spans
- Write down the value in hands (hh).
- Multiply that value by the factor 0.4444444444.
- The product is the equivalent value in spans (span).
- To reverse, multiply the span value by 2.25.
Worked examples
Example 1 — Convert 1 hh to span:
1 × 0.4444444444 = 0.4444444444 span
Example 2 — Convert 100 hh to span:
100 × 0.4444444444 = 44.4444444444 span
Real-world example — Reference scenario in case of fallback
Conversion between human-scale length units is the everyday workflow of architecture, athletics, and apparel design — three of the most common contexts that span metric and imperial systems.
1 hh × 0.4444444444 = 0.4444444444 span
Real-world example — Adult height conversion
A 1.8-hand-tall person measures a value in spans that converts the height to the unit favoured by American forms, schools, or driver's licences. This is daily routine for anyone living between metric and imperial systems.
1.8 hh × 0.4444444444 = 0.8 span
Real-world example — Fabric purchase length
Two hands of fabric equals a value in spans essential for tailors and textile buyers sourcing material from international suppliers that quote in different units.
2 hh × 0.4444444444 = 0.8888888889 span
Hand to Span conversion table
Standard reference values for converting hands to spans:
| Hand [hh] | Span [span] |
|---|---|
| 0.01 | 0.0044444444 |
| 0.1 | 0.0444444444 |
| 1 | 0.4444444444 |
| 2 | 0.8888888889 |
| 3 | 1.3333333333 |
| 4 | 1.7777777778 |
| 5 | 2.2222222222 |
| 10 | 4.4444444444 |
| 20 | 8.8888888889 |
| 30 | 13.3333333333 |
| 40 | 17.7777777778 |
| 50 | 22.2222222222 |
| 100 | 44.4444444444 |
| 500 | 222.2222222222 |
| 1000 | 444.4444444444 |
Frequently asked questions
How many spans is 1 hand?
How do I convert hands to spans?
How do I convert spans back to hands?
How many spans is 100 hands?
Popular length unit conversions
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 hh = 0.4444444444 span) 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.