Dive Tools by Chris Uriarte

Quick calculators for technical divers: Maximum Operating Depth (MOD), best nitrox mix for a planned depth (with optional depth-buffer safety margin), Equivalent Air Depth (EAD), ppO₂ at depth, and Equivalent Narcotic Depth (END) for trimix. Supports feet and meters.

Compare the total cost of diving a Closed Circuit Rebreather versus Open Circuit Trimix or Nitrox over a configurable number of dives. Models gas, scrubber, oxygen, deco cylinders, and recoup period for CCR initial costs.

Partial-pressure gas blender for nitrox and trimix. Three modes: know the target mix and get fill instructions, know what you added and get the resulting mix, or specify O₂/He/top-off amounts directly for a free-form blend. Supports psi and bar.

Live bidirectional conversions for the units technical divers use most: feet ↔ meters, psi ↔ bar, pounds ↔ kilograms, cubic feet ↔ liters, °F ↔ °C, and depth ↔ ATA in both unit systems. Type in either box to update the other instantly.

Match turn pressures by volume when buddies dive with different-sized tanks. Enter each diver's tank config and fill pressure, pick a reserve rule (thirds, halves, sixths, or custom), and see who's the controlling tank plus each diver's matched turn pressure. Supports psi/cu ft and bar/L.

Side-by-side spec comparison of up to three scuba cylinders. Choose from ~90 aluminum and steel cylinders across Catalina, Luxfer, Metal Impact, Thunderbird, Faber, OMS, PST, and Worthington. Filter by material or capacity, switch between imperial and metric units.

Dynamic assembly checklist for the Dive Rite O₂ptima CMCL / Choptima rebreather. Record build & dive info, check off steps with inline mV / voltage / gas-analysis fields, reorder steps to match your workflow, add custom steps, and print or save as PDF. State saves automatically to your browser.