# O2 Calculator Companion — Accurate EMS Oxygen Calculator > EMS oxygen tank duration calculator for critical care professionals. (iPhone/iPad app by Joseph Perry.) - Source: https://appshunter.io/ios/app/o2-calculator-companion/id6747102425 (this page in markdown: same URL + `.md`) - Developer: [Joseph Perry](https://appshunter.io/developer/1816230056) - Category: Medical, Utilities - Price: $4.99 - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 15.6 · 2 MB - Languages: American English - Released: 2025-06-17 - Data updated: 2026-08-25 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/o2-calculator-companion/id6747102425/reviews.md ## What is O2 Calculator Companion? The O₂ Calculator Companion is a mission-critical tool designed for EMS professionals, paramedics, and emergency responders. Quickly and accurately estimate oxygen tank duration in real-time based on tank type, PSI, and flow rate — all in the palm of your hand. Built to perform under pressure, this app helps eliminate guesswork in critical care scenarios where every second counts. Designed for Field Use: Fast, intuitive interface optimized for iPhone and iPad Minimal taps to enter tank data and get immediate duration estimates Works offline — no internet needed in remote or chaotic environments Key Features: Supports multiple tank types (D, E, M, Jumbo D, etc.) Adjustable PSI and flow rate settings Automatic safety margin factored into calculations (default 200 PSI) Smart alerts for Insufficient O₂ and Sufficient O₂ Custom caution zone alerts before depletion Responsive modal-style warnings to enhance decision-making in the field Built for Real-World EMS: Ideal for ambulance crews, flight medics, field hospitals, and disaster response teams Created by EMS professionals with real frontline experience Use it during patient transport, at scene, or in clinical training environments Data & Privacy: No personal data collected. No login required. Just reliable calculations when you need them most. Why O₂ Calculator Companion? Paramedics, EMTs, and emergency responders rely on rapid, accurate tools. The O₂ Calculator Companion empowers you to confidently manage oxygen resources with a simple, high-clarity interface and built-in alerting logic — no clutter, no distractions, just performance. Join the thousands of EMS professionals already optimizing care with smarter oxygen monitoring. ## Key features - Real-time oxygen tank duration estimation - Supports multiple tank types - Adjustable PSI and flow rate settings - Automatic safety margin calculations - Smart alerts for O₂ levels - Offline functionality ## Chart rankings - #192 in Top Paid · Medical (US App Store) ## Frequently asked questions about O2 Calculator Companion ### What is O2 Calculator Companion? O2 Calculator Companion is a medical app designed for EMS professionals to quickly and accurately estimate oxygen tank duration in real-time based on tank type, PSI, and flow rate. ### How much does O2 Calculator Companion cost? O2 Calculator Companion is a paid app, priced at $4.99. ### Does O2 Calculator Companion work offline? Yes, O2 Calculator Companion is designed to work offline, making it suitable for use in remote or chaotic environments where internet connectivity may be unavailable. ### What devices is O2 Calculator Companion compatible with? O2 Calculator Companion is compatible with iPhone, iPad, and iPod devices. ### Does O2 Calculator Companion collect personal data? No, O2 Calculator Companion does not collect personal data, and no login is required. It focuses solely on providing reliable calculations. ### How often is O2 Calculator Companion updated? The latest version, 5.0, was released on July 21, 2025, indicating active development and updates. ### What is the age rating for O2 Calculator Companion? O2 Calculator Companion has an age rating of 4+, making it appropriate for a wide range of users. ### What are the key features of O2 Calculator Companion? Key features include real-time duration estimation, support for multiple tank types, adjustable PSI and flow rate settings, automatic safety margins, and smart alerts for oxygen levels. ## Version history (last 3 releases) ### 5.0 — 2025-07-21 • Major UI redesign for speed and clarity • Added DevForge branding and new logo • Improved alert banners and calculator precision • Optimized for iOS 18 compatibility ### 4.0 — 2025-06-21 What’s New in This Version Improved Oxygen Sufficiency Logic The app now uses enhanced EMS-standard calculations to compare available oxygen duration against real-time travel estimates. This ensures proper tier classification: Insufficient: Less than 15 minutes Borderline: 15 to 30 minutes Sufficient: Over 30 minutes Dynamic Location-Based Recalculation Updating the pickup or drop-off locations now triggers a fresh travel time fetch and updated oxygen recommendation, based on your current route. New Reset Button Quickly clear all fields with the new Reset button below the "Get Recommendation" action, ideal for entering new scenarios on the fly. Refined UI Feedback Status tiers now display dynamic color-coded alerts (red, yellow, green), improved centered recommendation text, and clear banners for better in-app clarity. Smarter AI Recommendation Engine Our AI has been refined to deliver EMS-style recommendations tailored to your PSI, flow rate, tank size, and trip duration. In-App Help Sheet Tap the “?” icon to view a helpful guide on how to use the app, including a step-by-step walkthrough for new users. ### 2.0 — 2025-06-17 No release notes. ## Apps similar to O2 Calculator Companion | App | Rating | Price | Category | | --- | --- | --- | --- | | [OxiWear Medical](https://appshunter.io/ios/app/oxiwear-medical/id6459476135) | — | Free | Medical | | [CVR Calc](https://appshunter.io/ios/app/cvr-calc/id1423744026) | 3.3 (26) | Free | Medical | | [OxyCalc](https://appshunter.io/ios/app/oxycalc/id6747904905) | 5.0 (12) | Free | Medical | | [iPCR Insight](https://appshunter.io/ios/app/ipcr-insight/id894559923) | 4.2 (10) | Free | Medical | | [Drip Rate Infusion Calculator](https://appshunter.io/ios/app/drip-rate-infusion-calculator/id1170779602) | 3.5 (6) | $9.99 | Medical | | [Rapid Vent Calculator](https://appshunter.io/ios/app/rapid-vent-calculator/id6451494244) | 5.0 (45) | Free | Medical | ## More apps by Joseph Perry - [Glasgow Veterans Memorial](https://appshunter.io/ios/app/glasgow-veterans-memorial/id6769423872) All apps by Joseph Perry: https://appshunter.io/developer/1816230056 --- *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 2026-08-25.*