TrimixCalc is the continuing development of NitroxCalc for tec divers.
More and more ambitious divers are interested in mixed gas diving with helium added to the breathing gas. In addition to oxygen
now helium is considered in the calculations of EAD and MOD. With this App, it is now possible to accurately and quickly calculate maximum depth, depth comparison and Best Mix for your dive.

This of course does not replace a careful dive planning. But you get a first result of the gas mixtures you need for your dive.

An important tool is the additional gas blender function, which tells you how much of each gas to add in order to achieve a target mixture given a specific starting point of tank pressure and gas concentration (especially useful when you have precious left over gas in your tank from a previous dive). We do recommend however to leave the mixing to certified professionals.

This version is limited to 21%-28% O2 and 0-25%He. Blending only starts with empty bottles. If you are a ambitious tek-diver, you may switch to a unlimited version
via In-App purchase.

Have fun with the app! Issues and error messages will be answered via our contact address.
References in the reviews are not useful to us, since we have no access to it.

What’s New

Version 1.2

This app has been updated by Apple to display the Apple Watch app icon.

The first version in Spanish and Italian

App Privacy

The developer, frobese GmbH, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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