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

The first version in Spanish and Italian

Ratings and Reviews

4.3 out of 5
9 Ratings
9 Ratings

Solid app for mixing

Easy to use Interface which allows you to use your finger or type in values. I feel the touch is a little off and find myself hitting other tabs. The upgrade is $3.99 and would make an excellent choice if one were more serious about using this app.

tek diver

O2 error

O2 calculations are off by a factor of 2. 20% of O2 in a 3000 psi tank should be 600 psi. I think there is a mistake in the programming.

Developer Response

Please send us the parameters to check the calculation. Have you considered, that topping with air increases the O2 ration in the tank?


frobese GmbH
7.8 MB
Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.
English, German, Italian, Russian, Spanish
Age Rating
Rated 4+
© frobese GmbH
In-App Purchases
  1. Tec Dive $3.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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