Convert Span to Barleycorn
Convert spans to barleycorns instantly. 1 span = 26.9999998937 barleycorn — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Barleycorn to Span converter for the reverse conversion.
Units explained
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.
Barleycorn
A barleycorn is an Imperial unit of length equal to one third of an inch (about 8.47 mm). It is the basis of UK shoe sizing and is one of the oldest English length units still in use.
The barleycorn derives from the average length of a grain of barley as a natural reference. Standardised at exactly 1/3 inch by the Statute of Edward II in 1324, which used three barleycorns to define an inch.
Barleycorns are the foundation of UK and US children's shoe sizing — each whole size differs by one barleycorn. Also occasionally referenced in horse-handling and historical English literature.
Standardised in 1324 by the Statute of Edward II at 1/3 inch; the value became exact in 1959 when the inch was fixed at 25.4 mm.
Span to Barleycorn conversion formula
The relationship between spans and barleycorns:
To convert spans to barleycorns, multiply the value in spans by 26.9999998937. To reverse, multiply barleycorns by 0.0370370372.
How to use this converter
Type a value into the calculator. The result in barleycorns updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Barleycorn to Span converter for the reverse direction.
Step-by-step: convert spans to barleycorns
- Write down the value in spans (span).
- Multiply that value by the factor 26.9999998937.
- The product is the equivalent value in barleycorns (barleycorn).
- To reverse, multiply the barleycorn value by 0.0370370372.
Worked examples
Example 1 — Convert 1 span to barleycorn:
1 × 26.9999998937 = 26.9999998937 barleycorn
Example 2 — Convert 100 span to barleycorn:
100 × 26.9999998937 = 2699.9999893701 barleycorn
Real-world example — Body height conversion (reverse direction)
You measure 1.75 spans tall and need to fill in a gym membership form or medical record that asks for height in barleycorns. This is the most-used everyday length conversion in metric-using countries.
1.75 span × 26.9999998937 = 47.249999814 barleycorn
Real-world example — Pet and accessory dimensions
A 3-span dog leash equals a tidy round value in barleycorns. Pet-supply shopping frequently mixes the two units across product specifications.
3 span × 26.9999998937 = 80.9999996811 barleycorn
Real-world example — Fabric and tailoring
One span of fabric converts to a value in barleycorns commonly used for seam allowances. Garment patterns frequently switch between the two units on a single instruction sheet.
1 span × 26.9999998937 = 26.9999998937 barleycorn
Span to Barleycorn conversion table
Standard reference values for converting spans to barleycorns:
| Span [span] | Barleycorn [barleycorn] |
|---|---|
| 0.01 | 0.2699999989 |
| 0.1 | 2.6999999894 |
| 1 | 26.9999998937 |
| 2 | 53.9999997874 |
| 3 | 80.9999996811 |
| 4 | 107.9999995748 |
| 5 | 134.9999994685 |
| 10 | 269.999998937 |
| 20 | 539.999997874 |
| 30 | 809.999996811 |
| 40 | 1079.999995748 |
| 50 | 1349.999994685 |
| 100 | 2699.9999893701 |
| 500 | 13499.9999468504 |
| 1000 | 26999.9998937008 |
Frequently asked questions
How many barleycorns is 1 span?
How do I convert spans to barleycorns?
How do I convert barleycorns back to spans?
How many barleycorns is 100 spans?
Popular length unit conversions
Convert Span to other length units
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 span = 26.9999998937 barleycorn) 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.