Dock Line Length Arithmetic
Calculate individual and combined line lengths from overall boat length and your own multipliers.
A QUICK WALKTHROUGH
How to use this tool
- Enter positive length overall in metres.
- Enter your nonnegative head/stern and spring multipliers, then calculate.
- Calculate, then copy the report or download TXT.
Calculation
One head/stern = LOA × head/stern factor. One spring = LOA × spring factor. Each class has two lines; all-line total = 2 × head/stern + 2 × spring.
What the result covers
User-selected proportions only. No mooring ratio or numeric default is recommended. The model assumes one head line, one stern line and two springs. It does not calculate berth geometry, knot/splice allowance, tide, strength or safe mooring arrangements.
Local processing
Inputs remain in your browser. Copy and TXT download contain your inputs, results, formula and scope note.
GOOD TO KNOW
Common questions
Are the multipliers recommendations?
No. Both must come from your own independently determined requirements.
Are fittings and splices included?
No. Results are length products only; allowances and actual mooring requirements need separate assessment.