Nitrox Calculator
Compare Air and EANx no-decompression limits, calculate Maximum Operating Depth, check ppO₂ and review Equivalent Air Depth.
OPEN NITROX CALCULATOR →
Dive planning tools
Dive Tools
Free scuba diving calculators and planning tools for Nitrox, MOD, EAD and more.
Free scuba tools
Plan smarter. Dive better.
Practical calculators and reference tools for recreational scuba diving, built to make common planning checks faster and easier.
Surface Air Consumption
Calculate your Surface Air Consumption (SAC) rate from tank size, pressure used, dive time and average depth.
OPEN SAC CALCULATOR →Tank Autonomy Calculator
Estimate how long a scuba cylinder can last at a selected depth using your SAC rate, tank volume and starting pressure.
OPEN TANK AUTONOMY →Consumption Autonomy Calculator
Calculate depth and time autonomy from your Surface Air Consumption and available gas.
OPEN AUTONOMY CALCULATOR →Best Nitrox Mix
Find the highest practical oxygen percentage for a planned maximum depth and selected ppO₂ limit.
OPEN BEST MIX CALCULATOR →Weight Calculator
Estimate the amount of ballast you may need based on exposure protection, cylinder configuration, environment and diver profile.
OPEN WEIGHT CALCULATOR →Equivalent Air Depth
Convert an EANx dive depth to its Equivalent Air Depth for nitrogen exposure comparison and table planning.
OPEN EAD CALCULATOR →CNS Oxygen Clock
Estimate CNS oxygen toxicity exposure and cumulative percentage across multiple dives.
OPEN CNS CLOCK →Nitrogen Narcosis & END Calculator
Calculate Equivalent Narcotic Depth and compare narcotic load for air, EANx and trimix planning.
OPEN END CALCULATOR →Repetitive Dive & Surface Interval Calculator
Plan repetitive dives using residual nitrogen, pressure groups and surface interval credit for air and Nitrox.
OPEN REPETITIVE DIVE PLANNER →Minimum Gas & Rock Bottom Calculator
Calculate minimum gas, rock-bottom pressure and a turn pressure for an emergency ascent with a buddy.
OPEN MINIMUM GAS CALCULATOR →Nitrox Blending Calculator
Calculate oxygen and air additions for partial-pressure Nitrox blending and other common EANx filling workflows.
OPEN NITROX BLENDING →
Planning reference only.
These tools are designed as educational and reference aids. Always analyse your gas, follow your training and use an appropriate dive computer or approved dive-planning method.