Dive Calculators
Free dive planning tools
Maximum operating depth, oxygen partial pressure, best mix, equivalent air depth and air consumption. Results update as you type.
Maximum operating depth
How deep you can take a gas before its oxygen reaches your PPO₂ limit.
Oxygen partial pressure
The PPO₂ of your gas at a depth, against the usual limits.
Best nitrox mix
The richest oxygen mix you can breathe at your planned depth without going over your PPO₂ limit.
Equivalent air depth
The depth on air that gives the same nitrogen load as your nitrox, for air tables and planners.
Air consumption (SAC and RMV)
How fast you breathe gas at the surface, worked out from a dive you have done.
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Safety notice
These calculators are for education and dive-planning practice. Always:
- Verify calculations independently
- Dive within your certification limits
- Follow your training agency's guidelines
- Use proper dive planning procedures
- Never dive alone