Scuba Diving Calculators
Free scuba diving calculators.
Tank duration, weight belt, surface interval, and no-decompression limits.
No-Decompression Limit (NDL) Calculator
Look up no-decompression limits (NDL) by depth from PADI recreational dive tables. Maximum bottom time before a decompression stop is required.
Scuba Surface Interval Calculator
Calculate how your pressure group changes during a surface interval between dives. Based on PADI dive tables for repetitive dive planning.
Scuba Tank Duration Calculator
Calculate how long a scuba tank will last at a given depth. Enter tank size, pressure, and your surface air consumption (SAC) rate.
Scuba Weight Belt Calculator
Estimate how much weight to wear for scuba diving. Based on your wetsuit thickness, body composition, tank type, and water salinity.