Nitrox
Nitrox Calculator
Calculate maximum operating depth, best mix, oxygen partial pressure and equivalent air depth.
Open Nitrox CalculatorFree Dive Planning Tools
Scuba Diving Calculators
Practical calculators for common scuba-diving math: nitrox limits, breathing-gas consumption, depth and pressure. The formulas are transparent so you can see what the result means instead of treating the tool like a black box.
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Dive planning tools
Each page focuses on one type of calculation and includes the formula, examples and safety context.
Gas Planning
Scuba Gas Consumption Calculator
Estimate SAC, RMV, surface-equivalent gas use, required starting pressure and tank duration.
Open Gas Calculator
Physics
Depth & Pressure Calculator
Convert depth to ambient pressure, pressure back to depth and estimate cylinder gas volume.
Open Depth Calculator
Important
Use calculators as planning aids, not as dive computers
These tools perform standard mathematical calculations. They do not know your certification level, health, workload, current, temperature, ascent profile, decompression status, equipment configuration or emergency-gas requirements. Always plan and execute dives within your training, analyze breathing gas before use and follow the limits shown by your properly configured dive computer and training agency.
New to enriched air? See the Nitrox Diver course. New to scuba? Start with the Open Water Diver course.