Marine Cordage
Strength goes with the square of diameter, so a line one size up is not a little stronger — it is a lot heavier too.
— kN
New, unspliced rope
The material factor is a fitted construction constant and must come from the manufacturer's certified MBL, not from a general table — braid pattern, fibre grade and finish all move it. Mooring is a life-safety application governed by class and terminal rules: snap-back zones, line management and inspection intervals sit outside anything this calculates.
Marine Hawser Minimum Breaking Load & Working Limit Calculator — free, with the formula and a worked example, at Textile School.