Capsize Screening Formula: not a safety test
A simple screening formula does not describe a complete boat’s stability.
Conventional formula
CSF = beam_ft / (displacement_lb / 64)^(1/3)In plain language
CSF combines beam and displacement, using feet and pounds. The denominator uses the cube root of volume under the 64 lb per cubic foot convention.
How to interpret it
We show the figure and its inputs without a pass/fail badge.
Why it matters
It helps explain why geometric screening differs from a stability assessment.
Limitations
Centre of gravity, stability curve, loading, openings and structural integrity are outside this calculation. A single threshold does not prove safety.
In practice
For real decisions, seek documentation for the configuration and professional assessment of the individual boat.
Never use this figure alone to decide on a crossing.
Sources & reading
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