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

Quick Reference

1 Shackle = 120.0000 Span

1 Span = 8.333e-3 Shackle

Shackle to Span Conversion Formula

To convert Shackle to Span, multiply by 120.0000.

Span = Shackle × 120.0000

Shackle = Span × 8.333e-3

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

About These Units

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.

About Span

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

Shackle to Span Conversion Table

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

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