The RT Quick Calc is the must have app for any Respiratory Therapist looking to quickly and easily check or confirm calculations used in their every day job. Add frequently used calculations to your favorites for easy access! 30 formulas with more on the way! RT Quick Calc makes life as a respiratory therapist professional or student easy and worry free by giving you the peace of mind of correct calculations every time!

Current formulas include:
A-a O2 Gradient
a/A Ratio
Airway Resistance
Anion Gap
Bicarb Gap
Cardiac Index
Cardiac Output
Dynamic Compliance
Ejection Fraction
Expected pH
Have Want Formula (FiO2)
Have Want Forumla (Min VE)
Have Want Formula (RR)
Have Want Formula (VT)
Henderson Hasselbach Equation
Ideal Body Weight
Ideal Tidal Volume
Minute Ventilation
Oxygen Content
Oxygenation Index
P/F Ratio
Physiologic Deadspace
Point Seven Plus 20 Rule
Pulmonary Vascular Resistance (PVR)
Respiratory Rate
Static Compliance
Systemic Vascular Resistance (SVR)
Tidal Volume
Winter's Equation

If there is a calculation you have questions about or would like to see added, please email us at or through our contact form at Any feedback is also appreciated and will help us improve our app and ensure that it remains the respiratory therapist's calculator of choice!

What's New

Version 1.0.1

Fixed two favorites issues.

Fixed wording on description text for a few formulas.

Fixed a few calculation issues.

Customer Reviews

Very useful! I recommend it!


I use this app at least once per shift. No way I can remember all the equations that this app does for me. It's especially good for ventilator management.

Great useful app!


This app is great for all those formulas you learned in school and can't remember! I wish I would have had something like this while I was in school! It's great to do quick calculations on the spot. I love the have/want one, very helpful!!


Brandon Angelakos
14.8 MB
Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, German
Age Rating
Rated 4+
© 2014 Angrytacos Studios


  • Family Sharing

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

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