Use this free online calculator to convert Span to Shackle instantly. This all length conversions conversion tool provides accurate results for all your measurement needs.

Quick Reference

1 Span = 8.333e-3 Shackle

1 Shackle = 120.0000 Span

Span to Shackle Conversion Formula

To convert Span to Shackle, multiply by 8.333e-3.

Shackle = Span × 8.333e-3

Span = Shackle × 120.0000

To convert Shackle back to Span, divide by 8.333e-3 (or multiply by 120.0000).

About These Units

About Span

Span is the width of a human hand, from the tip of the thumb to the tip of the pinky finger.

About Shackle

The shackle is a traditional unit of length used for measuring the lengths of nautical cables and chains, especially anchor chains. Anchor chains are formed by using shackles to join short lengths of chain. When the anchor is dropped and the chain runs out, a seaman counting the number of shackles can report the total length of chain deployed. The size of the unit therefore varied somewhat, depending on the length of the short chains used. In Britain, the unit became standardized in the 16th century at 12.5 fathoms (75 feet or 22.86 meters). In 1949, the Royal Navy adopted a length of 15 fathoms, which is 90 feet or 27.432 meters; this brought the British shackle in line with the U.S. unit, which is usually called the shot.

Span to Shackle Conversion Table

Span	Shackle	Shackle	Span
0.1	8.333e-4	0.1	12.0000
0.5	4.167e-3	0.5	60.0000
1	8.333e-3	1	120.0000
2	0.016667	2	240.0000
5	0.041667	5	600.0000
10	0.083333	10	1200.00
20	0.166667	20	2400.00
25	0.208333	25	3000.00
50	0.416667	50	6000.00
100	0.833333	100	12000.00
250	2.0833	250	30000.00
500	4.1667	500	60000.00
1000	8.3333	1000	120000.00

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