# FiO2 Calculator

> FiO2 Calculator (iPhone/iPad app by Enoch Snowden.)

- Source: https://appshunter.io/ios/app/fio2-calculator/id6788442839 (this page in markdown: same URL + `.md`)
- Developer: [Enoch Snowden](https://appshunter.io/developer/6774816434)
- Category: Medical
- Price: Free
- Age rating: 12+
- Requires: iOS 17.0 · 2 MB
- Languages: English
- Released: 2026-07-14
- Data updated: 2026-07-22
- User reviews in markdown: https://appshunter.io/ios/app/fio2-calculator/id6788442839/reviews.md

## What is FiO2 Calculator?

FiO2 Calculator is a simple, fast reference tool for estimating fraction of inspired oxygen (FiO2) based on oxygen flow rate.
Select a delivery device from Nasal Cannula, Face Mask, or Non-Rebreather Mask (NRBM) and adjust the flow rate slider to see the estimated FiO2 percentage update instantly on a clear, easy-to-read gauge.
Features:
• Three oxygen delivery devices with device-appropriate flow ranges
• Instant FiO2 percentage estimate as you adjust flow rate
• Low-flow safety alerts (e.g. CO2 rebreathing risk on face mask below 5 LPM)
• Step-up suggestions when a device reaches its maximum flow rate
• Quick-access links to clinical references (Medscape, Geeky Medics, Open Critical Care)
For clinical reference only. This app is a quick-estimate tool and is not a substitute for professional clinical judgment, hospital protocol, or medical training.


## Version history (last 1 release)

### 1.0 — 2026-07-14

No release notes.

## More apps by Enoch Snowden

- [JAH CCU IV Infusions](https://appshunter.io/ios/app/jah-ccu-iv-infusions/id6774816432)

All apps by Enoch Snowden: https://appshunter.io/developer/6774816434

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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 2026-07-22.*