Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Builder displacement and ballast data
- Keel design information
- Stability documentation
Step-by-step instructions
Check the published calculation
Ballast ratio is typically ballast mass divided by overall displacement expressed as a percentage.
Consider ballast location
A deep bulb and a shallow encapsulated keel can produce different righting effects even with a similar ratio.
Look at hull form
Beam, center of gravity, hull shape and loading influence the overall righting moment.
Review formal stability data
Where available, compare stability curves, downflooding angles and design certification with qualified guidance.
Assess the actual boat
Added gear, batteries, tanks, cabin alterations or different keel variants may affect real-world behavior.
Safety note
A high ballast ratio does not guarantee a vessel cannot capsize.
Key takeaway
Ballast placement and complete stability characteristics matter much more than the isolated ratio.
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.