Nitrox Helper
Your essential dive buddy for Enriched Air Nitrox calculations. Quick, accurate, and designed for divers by divers.
iPhone & iPad • Free Download • Pro Subscription Available
Coming Soon to the App Store
Four Essential 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
Determine the deepest safe depth for any Nitrox mix. Essential safety information for every dive plan.
Equivalent Air Depth
Convert your Nitrox dive to an equivalent air depth for use with standard RDP tables.
Oxygen Partial Pressure
Monitor PPO at any depth with clear safety indicators. Warnings at 1.4 bar (caution) and 1.6 bar (danger) thresholds.
Sea or Lake? We've Got You Covered
Salt Water
Ocean and sea diving
10.0 m per atmosphere
Fresh Water
Lake and quarry diving
10.3 m per atmosphere
Fresh water is less dense than salt water, producing slightly different pressures at the same depth. Nitrox Helper accounts for this automatically, and a read-only indicator on every calculator tab shows your current water type setting.
Your Language, Your Style
8 Languages
- English (UK)
- English (US)
- Afrikaans
- Greek
- French
- Spanish
- German
- Dutch
Personalisation
- 16 beautiful colour themes
- Metric or Imperial units
- Salt or Fresh water
- Configurable decimal places
- Per-tab unit switching
- Light and dark modes
Built for Safety and Privacy
Safety First
Clear PPO safety indicators, MOD warnings, and a read-only water type display prevent accidental miscalculations.
Privacy First
No tracking, no analytics, no account required, no internet needed. Your data stays on your device.
Works Offline
Fully functional without an internet connection. Perfect for remote dive locations and boats.
Try Free, Dive Pro
Nitrox Helper is free to download with a 30-day in-app trial. Monthly and Annual plans also include a 1-month introductory offer. After the trial, upgrade to Pro for unlimited calculations, all 16 colour themes, and all future features.
Monthly
$0.99
per month
1-month free trial
6 Months
$5.99
per 6 months
Annual
$9.99
per year • Save 17%
1-month free trial
Lifetime
$39.99
one-time purchase
never pay again
Prices may vary by region.
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. Accuracy cannot be guaranteed. Use at your own risk.