Dalton: Dive Gas Tools

Know your gas. Trust your numbers.

Dalton is the gas calculator that shows its work. Every result is verified against PADI Nitrox Tables, TDI Trimix Tables, and Shearwater manuals. Every formula is published with step-by-step derivations and source citations. No black boxes.

GAS CALCULATIONS

- MOD (Maximum Operating Depth): Find the safe depth limit for any gas mix based on your ppO2 tolerance
- Equivalent Air Depth: Calculate nitrogen loading equivalents for nitrox decompression planning
- Equivalent Narcotic Depth: Determine narcotic effects at depth for trimix planning
- Best Mix: Find the optimal oxygen percentage for your target depth
- Gas Properties: Calculate density, partial pressures, and breathing resistance at depth

DIVE PLANNING

- Return Number: Gas volume required for safe ascent — rule of thirds, fourths, or custom reserve fractions. The overhead environment gas management tool most divers do on paper or skip entirely
- Dive Profile Advisor: Plan multi-level dives with gas switches, depth segments, and visual depth chart
- Bottom Time Calculator: Determine available bottom time based on gas supply and consumption

FORMULA REFERENCE

Tap any result to see the full formula derivation with source citations. Dalton is the only mobile gas calculator that publishes every formula it uses. Teach the math. Show the math.

SAFETY-FIRST DESIGN

- Three-tier safety warnings tied to recognized physiological thresholds
- Gas density tracking with 5.7 g/L threshold from Doolette and Mitchell research
- Configurable safety limits with ppO2 range from 1.2 to 1.6 bar
- Standard gas mix presets: Air, EAN32, EAN36, and common trimix blends
- Full gas range: air, nitrox, and trimix including hypoxic blends to 300m
- Offline-first design: no internet connection required
- No subscriptions, no ads, no account creation

Every calculation is verified. Every result is reliable.

A Tools for Divers, LLC product