# O2 Duration

> Oxygen cylinder duration and pressure calculator for medical professionals. (iPhone/iPad app by Advanced Aviation LLC.)

- Source: https://appshunter.io/ios/app/o2-duration/id556420187 (this page in markdown: same URL + `.md`)
- Developer: [Advanced Aviation LLC](https://appshunter.io/developer/540245667)
- Category: Utilities, Education
- Price: $2.99
- Rating: 1.00/5 from 1 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.0 · 1 MB
- Languages: American English
- Released: 2012-09-05
- Data updated: 2026-06-05
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/o2-duration/id556420187/reviews.md

## What is O2 Duration?

O2 Duration is an oxygen consumption calculator for various oxygen cylinder sizes. This is the easiest way to quickly determine the approximate number of minutes until an oxygen tank will be depleted of oxygen. This tool is a must have for Nurse's and EMT’s who work with portable oxygen cylinders. 

The application allows you to select cylinder tank sizes A, B, D E, G, H, K and M. With the current tank pressure and desired flow rate, the app will display the oxygen duration in minutes. Additionally, a timer can be started which will display a running tank pressure and time in minutes remaining until the tank is empty. When tank pressure reaches 500lbs or when the tank pressure is zero the application will alert you. 

This is not a substitute for looking at the oxygen cylinder gauge to determine actual pressure and should not be relied on as a means to determine oxygen remaining.

## Key features

- Oxygen cylinder duration calculation
- Supports multiple cylinder sizes (A, B, D, E, G, H, K, M)
- Input current tank pressure
- Input desired flow rate
- Displays duration in minutes
- Running timer with remaining time
- Low pressure alerts (500lbs and 0lbs)

## Chart rankings

- #199 in Top Paid · Utilities (US App Store)

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/o2-duration/id556420187/reviews.md

### 1/5 — Dan

*2020-03-05, version 2.0*

Math is wrong
Does not work and no refund
I would have thought Apple would have vetted this product 
Do no buy!

### 1/5 — Help

*2015-05-27*

My husband uses an m-248L (the old C class) There is no distinction between the tank sizes for the M class tanks that I can find on the app and there doesn't seem to be a corresponding tank size to pick. I am looking forward to using this app it seems very easy once I can get the correct tank size

## Frequently asked questions about O2 Duration

### What is O2 Duration?

O2 Duration is a utility app designed to calculate the approximate remaining oxygen in portable cylinders. It helps users determine how many minutes of oxygen are left based on cylinder size, current pressure, and desired flow rate.

### What cylinder sizes does O2 Duration support?

O2 Duration supports a range of cylinder tank sizes including A, B, D, E, G, H, K, and M.

### Does O2 Duration have a timer feature?

Yes, O2 Duration includes a timer that displays the running tank pressure and the time remaining in minutes until the tank is empty. It also provides alerts when the tank pressure reaches 500lbs or is at zero.

### What is the price of O2 Duration?

O2 Duration is a paid application, priced at $2.99. It does not feature in-app purchases or advertisements.

### What devices is O2 Duration compatible with?

O2 Duration is supported on iPhone and iPod devices. It was last updated on July 17, 2015, with version 2.0.

### Is O2 Duration suitable for all users?

O2 Duration has an age rating of 4+ and is primarily intended for medical professionals like nurses and EMTs. The developer advises that it is not a substitute for checking the oxygen cylinder gauge.

### How often is O2 Duration updated?

The application was last updated on July 17, 2015, to version 2.0. It was originally released on September 5, 2012.

### Does O2 Duration have ads?

No, O2 Duration does not contain advertisements. It is a paid utility app.

## Version history (last 4 releases)

### 2.0 — 2015-07-17

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

You can now edit tank names and size factors. Create your own custom tanks or modify the current list of tanks. Add and delete tanks as need to customs the app for your needs.
Bugs have been fixed.

### 1.2 — 2013-12-20

iOS 7 updates

### 1.1 — 2012-10-05

iPhone 5 screen support

### 1.0 — 2012-09-05

No release notes.

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## More apps by Advanced Aviation LLC

- [Lear W&B](https://appshunter.io/ios/app/lear-w-and-b/id540245664)
- [AA Expense](https://appshunter.io/ios/app/aa-expense/id564404321)
- [Aircraft W&B](https://appshunter.io/ios/app/aircraft-w-and-b/id566991783)

All apps by Advanced Aviation LLC: https://appshunter.io/developer/540245667

## Related topics

[cylinder duration](https://appshunter.io/ios/topics/cylinder-duration)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*