Scuba Diving Calculators | Divemaster Austin

Free Tools

Scuba Diving Calculators

Field-tested tools built by a PADI Divemaster. Plan safer dives, dial in your gas mix, and nail your weighting — all in one place.

Gas & Depth

3 calculators

Nitrox MOD Calculator

Find your maximum operating depth for any EANx mix and PPO2 limit. Supports imperial and metric.

EANx Best Mix Calculator

Calculate the optimal nitrox blend for your planned dive depth and PPO2 limit.

Equivalent Air Depth (EAD)

Convert your nitrox dive depth to the equivalent air depth for no-decompression limit planning.

Buoyancy & Weighting

2 calculators

Scuba Weight Calculator

Estimate your starting weight based on wetsuit thickness, tank type, body weight, and water type.

Lift Bag Size Calculator

Calculate the lift bag volume needed to raise an object from a given depth.

Air & Planning

3 calculators

Surface Air Consumption (SAC)

Calculate your SAC rate from a logged dive to predict air usage on future dives.

Tank Air Volume Calculator

Calculate the actual volume of gas in your tank at any pressure. Works for all tank sizes.

Turn Pressure Calculator

Find your turnaround pressure using the rule of thirds for out-and-back dives.

Safety Note: These calculators are tools to aid dive planning, not replacements for proper dive training. Always dive within your certification limits and consult a qualified instructor before attempting new dive types. No calculator replaces good judgment underwater.