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Scuba Calculators

These calculators help you plan common parts of a dive without doing all the math by hand. Use them as planning tools, not as a substitute for understanding your limits.

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Drawing of Daltons Triangle

MOD & EAD Calculator

Calculate maximum operating depth and equivalent air depth for common Nitrox mixes using your PO2 limit.
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Bubbles rising to the surface

RMV Calculator

Estimate your breathing rate (RMV) from a known dive so you can plan future gas needs safely and accurately.
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A row of scuba tanks

Minimum Gas Reserve Calculator

Build a realistic reserve for two divers to ascend together from planned depth with margin.
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Row of weights

Buoyancy and Weight Calculator

Get a defensible starting weight estimate based on suit, tank, and salt vs fresh water.

Keep building your dive knowledge with these next steps:

Calculate Breathing Rate

Calculate your Respiratory Minute Volume (RMV) so you can plan gas based on how you actually breathe, not a made-up average.

RMV Calculator

Estimate Weight Needed

Estimate how much weight you need based on your exposure suit, tank choice, and water type so you can show up with a realistic starting point.

Buoyancy Calculator

Which Agency For Me?

A simple quiz to help you think through which dive agency and training philosophy is most aligned with how you want to dive.

Agency Quiz