Boat Metrics Calculator
Usage
Use the following form to calculate a sailboat standard metrics. The formulae are given at the end of this page. The pre-loaded measurements are that of a Tanzer 7.5 - Just override them with your own values, then click the Calculate! button. For more information on sailboat metrics, consult the Ted Brewer Yacht Design website.The Calculator
Your Boat Measurements:
Metrics formulae explained:
All figures are based on the British Measurement Mystem.
Note: some Displacements are in British Tons (2,000 lbs), some in Long Tons (2,240 lbs).
Metrics | Formula |
---|---|
Sail Area - Displacement Ratio | Sail Area / (Displacement in Cubic Feet)2/3 |
Displacement - Length Ratio | (Long Ton Displacement) / (0.01 * LWL)3 |
Theoretical Hull Speed | 1.34 * (LWL)1/2 |
Motion Comfort | Displacement / { 2/3 * [ (0.7 * LWL) + (1/3 * LOA) ] * Beam4/3 } |
Balast - Displacement Ratio | (Ballast / Displacement) * 100 |
Capsize Screening Formula | Beam / (Displacement in Cubic Feet)1/3 |
Note: in the above formulae:
Displacement in Cubic Feet = Displacement in lbs / 64
Displacement in Long Tons = Displacement in lbs / 2,240