Maker & Reference
Knot Strength Reduction Calculator
Every knot weakens rope. A bowline keeps 65-75%, a figure-eight 75-80%. Pick the right knot for life-safety vs convenience.
Effective strength
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- Knot efficiency
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- Loss in lb
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- Best use
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FAQ
Why does a knot weaken rope? +
The bend at the knot puts inner fibers under different strain than outer. The first sharp bend (where it enters the knot) is usually where it fails.
Life-safety knots? +
Figure-eight followthrough is the gold standard for climbing. Bowline is also acceptable when properly tied + backed up.