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SAC rate calculator
Tank, pressures, depth, and time → your surface air consumption, in metric or imperial.
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Nitrox MOD calculator
Your O₂ percentage → maximum operating depth at ppO₂ 1.4 and 1.6, in metres and feet.
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Dive weight estimator
Body weight, suit, and water type → a starting weight range to refine with a buoyancy check.
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No-fly countdown
When you surfaced → your earliest flight times, following DAN guidance.
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Surface interval planner
Log your surfacing time and watch the interval tick up live between dives.
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Reef fish quiz
Ten common reef species, four choices each. Score, share, brag responsibly.