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. It looks almost identical at a glance, which is exactly the problem: 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.
Knot researchers have actually measured the difference directly: controlled tests comparing square and granny knots under identical loading conditions consistently show the granny slipping or capsizing at meaningfully lower loads, which turns what looks like a trivial tying-order mistake into a real, quantifiable safety gap whenever the knot in question is expected to hold anything of consequence. 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
Tuck the left-hand end under and over the right-hand end, same as starting a square knot.
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: It should never be relied on for joining rope under any real load; it is, essentially, a common mis-tied version of the square knot 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?
Yes - controlled comparisons consistently show the granny knot slipping or capsizing at lower loads than a correctly tied square knot, confirming it's a real mechanical difference, not just a tying-order technicality.
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.