Cordage

Spliced Eye Termination Efficiency Calculator

Splice it and lose a tenth. Knot it and lose closer to half. The rope is the same rope either way.

Rope Certified
kN
Terminations Efficiency
%
%

A bowline is around 55–60%; a figure-eight a little higher.

Eye & Safety Bend and design
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Bend efficiency taken as 1 − constant / (D/d); fit it to the rope.

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Spliced Strength

— kN

Rope MBL after the splice, before the eye bend

Termination Comparison

Knotted Strength
— kN
Splice Advantage
— kN
Advantage Over Knot
— %
Bend Efficiency at D/d
— %
Spliced Eye Over the Bend
— kN
Working Load Limit
— kN

Efficiencies are construction-specific and must come from tested terminations on the actual rope — a splice pattern that suits a three-strand rope is not the one a twelve-strand needs, and a badly tucked splice can be worse than a knot. Lifting and life-safety terminations require proof testing and certification.

Spliced Eye Termination Efficiency Calculator — free, with the formula and a worked example, at Textile School.