Dalton: Dive Gas Calculator
Nitrox & trimix calculator
About
This app calculates critical dive gas parameters like MOD, EAD, and END, showing all derivations. It offers advanced planning tools for dive profiles and bottom time, with sharing capabilities and home/lock screen widgets for quick access. All core gas calculations are free, with advanced features available via a one-time purchase.
What's New in Dalton
1.2.0
May 29, 2026
Dalton 1.2 brings glanceable safety data to your Home and Lock Screens, hands-free calculations, and stronger safety checks on shared links. • New Favorite Gas Mix Reference widget — pin a gas mix and reference depth, glance MOD, ppO₂, and gas density without opening the app. Three families for Home Screen and Lock Screen. Hard-fails to a safety placeholder when reference depth exceeds the mix's MOD. • Ask Dalton with Siri Shortcuts — MOD, EAD, END, Best Mix, and Gas Density now work hands-free. Trimix-only calculations stay gated behind Technical Diver mode. • Shared calculation links are validated against Dalton's safe-range rules before any tool state is populated. Links carrying unsafe values (ppO₂ > 1.6, O₂ ≥ 100%, depth > 200 m) are refused with a clear alert naming the offending field.
MoreIn-App Purchases
$14.99
Dalton Pro
Unlocks advanced gas tools.
Developer apps
FAQ
What is Dalton?
Dalton is a dive gas calculator that provides transparent calculations for parameters like MOD, EAD, and END. It shows step-by-step derivations for all its formulas, verified against industry standards.
Is Dalton free to use?
Yes, all core gas calculation tools in Dalton are free to use. Advanced dive planning features like Return Number, Dive Profile Advisor, and Bottom Time Calculator require a one-time in-app purchase.
What dive gases can Dalton calculate?
Dalton supports a full gas range including air, nitrox, and trimix, even hypoxic blends. It can calculate parameters for depths up to 300m.
Does Dalton have ads?
No, Dalton does not contain advertisements. The app is designed to be ad-free for a focused user experience.
Can I share my calculations from Dalton?
Yes, you can share any result as a URL with a QR code. Recipients can open the calculation directly in the app or view a web preview.
What devices does Dalton support?
Dalton is available for iPhone and iPad devices, offering a mobile solution for dive planning.
How often is Dalton updated?
The latest version of Dalton is 1.2.0, last updated on May 29, 2026. Updates typically include new features, bug fixes, and performance improvements.
Does Dalton work offline?
Yes, Dalton is designed with an offline-first approach, meaning it does not require an internet connection to perform calculations.