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Displacement Hull Speed Calculator — result sheet
Estimate a traditional displacement-hull speed from waterline length using a supplied hull-speed coefficient.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Hull speed in knots = coefficient × √(waterline length in feet).
The traditional rule of thumb expresses a speed scale for displacement hulls rather than a universal boat-performance limit.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Waterline length — ft; minimum 1.0E-6; maximum 1000000
- Hull-speed coefficient — minimum 1.0E-6; maximum 100
Worked example
| Input | Value |
|---|---|
| Waterline length | 25 |
| Hull-speed coefficient | 1.34 |
Hull-speed estimate = 6.70 knots.
Assumptions and limits
- Waterline length is in feet and the coefficient is positive.
- The rule is used as a rough displacement-hull reference.
- Hull form, displacement, trim, propeller, waves, wind, planing, and navigation safety are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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