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Workshop tools

Rope diameter calculator

Estimate the diameter of a three-strand rope from a catalog thread or a custom dTex value, or find threads within ±15% of a target diameter.

How it works

All ropes have three strands. A 2 × 3 construction uses two threads per strand, six threads in total. The calculator checks 1, 2 and 3 threads per strand.

Reverse search lists matches by absolute percentage deviation, then by dTex. Diameters are calculated estimates, not measured values.

Need a target diameter?

If you already know the rope diameter you need, switch the mode toFind threads for a target diameter or open the rigging calculator, whose rows link here with the diameter prefilled.

Estimate only. Actual diameter varies with material, tension and twist. Not a guarantee for full-size rope.

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