Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Accurate displacement and beam data
- Model specification sheets
- Cruising requirements
Step-by-step instructions
Start with verified dimensions
Ratio calculators depend on displacement and hull geometry that may differ by model variant and load.
Review comfort ratio context
Comfort ratio uses displacement and length-related measurements as a rough motion indicator, not a measured comfort guarantee.
Interpret capsize screening cautiously
The commonly quoted capsize screening formula is a historical screening heuristic, not a certification of resistance to capsize.
Compare more than ratios
Look at stability curves, ballast arrangement, righting characteristics, construction and actual loading.
Use expert guidance
Combine model research, experienced owner information and a professional assessment for serious offshore plans.
Safety note
Never choose a vessel for an ocean crossing based solely on comfort ratio, hull speed or capsize screening numbers.
Key takeaway
Design ratios can start a conversation, but they cannot certify a boat as safe offshore.
Keep this job on your maintenance schedule
Save the topic as a maintenance task, choose a due date or engine-hour target, and record future service. Free and stored on your device.
Add to my maintenance plannerThis guide is for general education. Follow your equipment manufacturer’s instructions, current navigation guidance and applicable marine safety standards. When uncertain, use a qualified marine professional.