Granny Knot
bend knot
The granny knot is what most people accidentally tie when they're trying for a square knot but get the second tuck's direction wrong - instead of "left over right, then right over left," they tuck the same way both times. At arm's length the two are hard to tell apart, and that is the whole danger: the resulting knot is measurably less stable, and the difference isn't folklore, it's simple, demonstrable mechanics.
A correctly-tied square knot's two tucks oppose each other, which locks the knot flat and symmetric. The granny knot's matching tucks don't oppose - they let the whole knot rotate under an uneven pull, and that rotation is what lets it slip or capsize far more readily than its properly-tied cousin. Anyone can test this directly: tie both knots in the same cord and pull one end hard; the granny will noticeably shift and loosen while the square knot holds its flat shape.
Because it's so often tied unintentionally, the granny knot's real danger isn't in some deliberate use - it's in someone believing they've tied a secure square knot when they haven't. The fix is simply learning to check: a properly tied square knot lies flat with its loops interlocking symmetrically; a granny knot sits twisted and at an angle, and that visual check takes only a second.
The difference has been studied directly: a 2020 Science paper modelling and testing knots in elastic fibre found the reef knot holds where the granny tends to slip easily, tracing it to the opposing twist that a correctly tied square knot has and a granny does not. It is also easy to demonstrate by hand - tie both in the same cord and pull one end hard; the granny shifts and loosens where the square knot holds its flat shape. The consequence follows from that shape: a granny knot can slip under heavy load, can release suddenly and unpredictably, and should never be used as a bend. Teaching the visual check - flat and symmetric versus twisted and angled - remains more effective than trying to memorize the tuck sequence alone, since most people who tie a granny by mistake genuinely believe they've followed the square knot rhyme correctly.
How to tie the Granny Knot
- 1Cross the left end over the right end and tuck it under - exactly as you would start a square knot.
- 2Cross the other end over this time, repeating the same left-over-right motion you used first. Both half knots now turn the same way - that sameness is what makes it a granny rather than a square knot.
- 3Pull both pairs of ends to dress the knot.
- 4Notice the knot sits at an angle rather than lying flat - a visible sign it's a granny, not a square knot.
- 5Check where the ends come out: on a granny the free end and standing part on each side leave the knot on opposite sides of each other. On a correctly tied square knot they leave together, lying parallel.
Strength & security
Structurally unstable compared with its close relative, the square knot - the same-handed second tuck (rather than the opposite-handed tuck a square knot uses) leaves the knot able to rotate and slip under load in a way that's easy to demonstrate and well documented.
Cautions: Nothing carrying real load should depend on it; it is simply the square knot tied wrong, that most people learn by accident rather than on purpose.
Alternatives
- Square Knot
The correctly-tied version of the same basic idea - reversing the direction of the second tuck is the entire fix, and it produces a genuinely more stable, flat-lying knot.
FAQ
How can I tell if I've tied a granny knot instead of a square knot?
A square knot lies flat and symmetric with its loops interlocking cleanly. A granny knot sits twisted, at an angle, because its two tucks go the same direction instead of opposing each other.
Is the granny knot ever the right knot to use?
Not really - it's essentially an unstable, accidentally mis-tied square knot. Whenever a square knot would be appropriate, the correctly-tied version is simply better and no harder to learn.
Has the difference between a square knot and granny knot actually been tested?
Once, properly - a 2020 Science paper on knots in elastic fibre, which found the reef holds where this one lets go. One study, in fibre rather than rope, so we will not overstate it; but nobody disputes the direction, and the failure is documented as sudden.
Why does the rhyme 'left over right, right over left' exist?
It's a memory aid for the correct opposing-tuck sequence that produces a square knot rather than a granny knot - reciting it while tying is a simple, effective way beginners avoid accidentally reversing the second tuck, which is the single change that turns a stable knot into an unstable one.
Can a granny knot be fixed without retying the whole thing?
Not really - because the error is in the direction of the second tuck, the cleanest fix is simply untying the second tuck and retying it in the opposite direction, which effectively converts it into a proper square knot in seconds.
Do experienced knot-tyers ever tie a granny knot by accident?
Yes, especially when tired or working by feel in the dark, which is exactly why the visual flat-versus-twisted check is taught alongside the tying rhyme - relying on the rhyme alone doesn't catch every slip.