Nitrox Helper
Nitrox Diving Calculator
Free · In‑App Purchases · Designed for iPad
Essential Nitrox calculators in 8 languages with 16 beautiful themes. Calculate for sea or lake diving.
Nitrox Helper is a Nitrox calculator designed for qualified EAN divers.
Whether you're at the dive shop deciding on your mix or reviewing calculations before a dive, Nitrox Helper gives you quick, accurate answers with an interface designed for ease of use - even with cold hands.
Your essential dive buddy for Enriched Air Nitrox (EAN) calculations.
FOUR POWERFUL CALCULATORS
Best EAN Mix
Calculate the optimal oxygen percentage for your planned depth and PPO limit. Know exactly what mix to ask for at the fill station.
Maximum Operating Depth (MOD)
Determine the deepest safe depth for any Nitrox mix. Essential for dive planning and safety.
Equivalent Air Depth (EAD)
Convert your Nitrox dive to an equivalent air depth for use with standard Recreational Dive Planner (RDP) tables.
Oxygen Partial Pressure (PPO)
Monitor your oxygen partial pressure at any depth. Clear safety indicators warn you when approaching or exceeding safe limits.
SALT WATER & FRESH WATER
Calculate accurately for both environments. Sea water (10.0 m/atm) and fresh water (10.3 m/atm) use different pressure factors - Nitrox Helper accounts for this automatically. A read-only indicator on every calculator tab shows your current water type so you always know what you're calculating for.
8 LANGUAGES
Use the app in your preferred language:
English (UK), English (US), Afrikaans, Greek, French, Spanish, German, and Dutch.
PERSONALISE YOUR EXPERIENCE
- 16 beautiful colour themes
- Metric (metres) or Imperial (feet) units
- Configurable decimal places (0-3) for depth and PPO results
- Per-tab unit switching from the toolbar
DESIGNED FOR SAFETY
- Clear PPO safety status indicators (Safe / Caution / Danger)
- Visual warnings when exceeding Maximum Operating Depth
- Read-only water type indicator prevents accidental changes
- Important safety disclaimer on every calculator
PRIVACY FIRST
Your data stays on your device. No tracking, no analytics, no account required, no internet connection needed.
TRY BEFORE YOU SUBSCRIBE
The app has two separate trial mechanisms:
1. Nitrox Helper is free to download with a 30-day in-app trial that gives full access for 30 days.
2. 2-week introductory offer — Available on the Monthly, 6 Monthly, and Annual subscription plans.
Compatible with iPhone and iPad.
The Pro Tier has three subscription options.
Nitrox Helper Pro Monthly at $0.99 a month with a 2-week free trial.
Nitrox Helper Pro 6 Months at $5.99 every 6 months with a 2-week free trial.
Nitrox Helper Pro Annual at $9.99 a year with a 2-week free trial — our best value.
Nitrox Helper Pro Lifetime at $49.99 one-time.
You control your subscriptions through the App Store subscription settings.
DISCLAIMER: This calculator is for discussion purposes only and is not intended for actual dive planning. Always refer to your certifying agency's Enriched Air Diving procedures to plan your dives.
Privacy Policy URL https://solosoftware.app/nitrox-helper/Nitrox_H_Privacy_Policy.html
Your use of Nitrox Helper is governed by Apple's standard Licensed Application End User License Agreement. Terms of Service (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
This app hasn’t received enough ratings or reviews to display an overview.
Completely rebuilt from the ground up with a modern, beautiful design.
NEW IN THIS VERSION:
- Fresh water diving support
- 8 languages: English (UK/US), Afrikaans, Greek, French, Spanish, German, Dutch
- 16 colour themes to personalise your experience
- Configurable decimal places for precision
- Water type indicator on all calculator tabs
- Guided onboarding to get you started quickly
The developer, Robert O'Connell, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Robert OConnell
- Size
- 7.1 MB
- Category
- Sports
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Pro Lifetime $49.99
- Pro 6 Monthly $5.99
- Pro Annual $9.99
- Pro Monthly $0.99
- Copyright
- © 2026 Robert O'Connell