Trip readiness
Start the ballast conversation with realistic assumptions
Use a conservative starting range before doing a real buoyancy check with your operator or instructor.
Planning aid
Starting ballast estimate
Use this only as a first-pass range before an actual in-water check.
kg
Starting range
5-7 kg
Check
Do a real buoyancy check near the end of the dive.
Planning boundary: Ballast estimates are starting points only. Confirm weight, trim, exposure protection, cylinder behavior, and reserve buoyancy with an in-water check.
Formula and source notes
For oxygen and table context, review DAN oxygen toxicity guidance and NOAA Diving Program resources.