Marine Life Calendar: when to see what in SE Asia
Browse 12 marine species by month and dive location across Thailand, Indonesia and the Philippines. Whale shark, manta, mola mola, hammerhead season windows.
Free diving tools
Six calculators and a marine-life calendar. No accounts, no tracking.
NDL Calculator — No-Decompression Limits
Quick lookup of recreational no-decompression limits by depth, based on PADI RDP Table 1. Metric and imperial units.
Nitrox Calculator: MOD, EAD, Best Mix
Three calculators for Enriched Air Nitrox: Maximum Operating Depth (MOD), Equivalent Air Depth (EAD), and Best Mix for a target depth.
SAC Rate Calculator
Calculate your Surface Air Consumption (SAC) rate from any dive. Compare against benchmarks for novice, experienced, and tech divers.
Surface Interval & Flying-After-Diving Timer
Live countdown to safe flying time after diving, based on DAN guidelines. Single dive, multi-day, or decompression — choose your profile.
Dive Weight Calculator — How Much Lead to Wear
Estimate your starting weight for scuba diving: body weight, wetsuit thickness, tank type, salt vs fresh water. Includes buoyancy-check procedure.
Disclaimers
These tools are educational aids. They are not a substitute for a personal dive computer, proper training, or current medical advice. If your dive plan or symptoms are anywhere near the limits these calculators flag, talk to a dive medical professional or call DAN Asia-Pacific +61-8-8212-9242.