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| Calculator | Formula | Inputs |
|---|---|---|
|
Sail Area / Displacement Ratio
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. |
SA / (Disp / 64)^(2/3) | Sail Area, Displacement |
|
Ballast / Displacement Ratio
A measure of the stiffness and power of a boat. Predicts the ability of a boat to stand up to the wind. |
Bal / Disp × 100 | Ballast, Displacement |
|
Displacement / Length Ratio
A measure of the ability of a boat to reach nominal hull speed. |
(Disp / 2240) / (0.01 × LWL)³ | Displacement, Waterline Length |
|
Comfort Ratio
A measure of motion comfort. Generally, the faster the motion, the more jarring/uncomfortable the ride. |
Disp / (0.65 × (0.7 × LWL + 0.3 × LOA) × Beam^1.33) | Displacement, Waterline Length, Length Overall, Beam |
|
Capsize Screening Ratio
A measure of the bluewater capabilities of a boat. |
Beam / (Disp / 64)^(1/3) | Beam, Displacement |
|
Estimated Hull Speed
The theoretical maximum speed of a displacement hull. |
1.34 × √LWL | Waterline Length |
|
Performance Calculator
Compute all performance ratios at once. |
All | All dimensions |
|
Sail Calculator
Calculate sail areas from sail plan dimensions. |
½ × base × height | I, J, P, E, PY, EY |