# CalcRx

> Outpatient prescription calculator for dispense quantities and billable days supply. (iPhone/iPad app by Dabbling Badger LLC.)

- Source: https://appshunter.io/ios/app/calcrx/id1005970010 (this page in markdown: same URL + `.md`)
- Developer: [Dabbling Badger LLC](https://appshunter.io/developer/455874932)
- Category: Medical, Utilities
- Price: Free with in-app purchases
- Rating: 4.70/5 from 15 App Store ratings · 5 written reviews indexed
- Age rating: 17+
- Requires: iOS 13.0 · 29 MB
- Languages: American English
- Released: 2015-10-16
- Data updated: 2026-08-31
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/calcrx/id1005970010/reviews.md

## What is CalcRx?

Calc Rx is an outpatient prescription calculator that makes determining dispense quantities and billable days supply fast and effortless.  Simply tap in the sig (directions) and Calc Rx does the rest.  Complex steroid tapers, warfarin regimens, ear/eye drops, liquids, and more are all a snap.  Pharmacists, pharmacy techs, nurses, and prescribers will be amazed by the time saved by this useful little app!

Features

*5 calculators specific to common outpatient dosage forms and regimens (tablets/capsules, oral liquids, ear/eye drops, insulin, and warfarin)
*fully equipped standard calculator with complete history display
*automatic quantity calculations for 30 and 90 day supplies
*unlimited undo for precision editing
*future fill date calculator
*sig code / medical abbreviation reference

Check out my other apps RxOrange and OTC Assistant!

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- Prescription quantity calculations
- Billable days supply determination
- Supports various dosage forms
- Handles complex regimens
- Standard calculator with history
- Sig code reference

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Yearly Full Access | $9.99 | per year |
| Monthly Full Access | $0.99 | per month |


## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/calcrx/id1005970010/reviews.md

### 5/5 — Solid

*2020-08-10*

Definitely a great app, I love the day supply function really helps with my adherence outreach so smooth; hopefully updates keep coming to make this app even better :)

### 4/5 — Very helpful with complex SIGs

*2019-05-29*

This app can be very helpful to determine the day-supply of medications. Really like that it includes drops and liquids. 

However, the reason I rated this app with 4 stars and not 5, it doesn’t include a dedicated inhaler or allergy-spray day-supply feature. Inhalers and allergy sprays (like fluticasone) can require more effort to determine the correct day-supply.  Taking the SIG and then having to determine how much medicine is contained within the product can take up more time. 

Luckily, most inhalers and other have meter-dosing or a certain number of puffs/sprays, so the calculations are more straight forward, but in the event that is not given a feature that could include that would be very helpful.

### 5/5 — Great

*2018-09-05*

This app helps you calculate quickly. I find very helpful when I can't seem to think fast enough. The only downside is the eye drops can only be 15gts or 20gts. At work we go by 16gts. Other than that this app is a great help.

### 5/5 — Excellent!

*2017-06-12*

I use this app almost every day at work. Does a very good job :) Highly appreciate the app!

### 5/5 — Essential app. Does just what it needs to.

*2017-04-25*

Seems to be the only app of its kind out there (particularly for calculating next fill date for controls and narcs). Love it! Only gripe is that when you drag icons to reorganize the tabs, the organization preferences don't save for next time you open the app. Anyway, this app is a must have for community pharmacists wanting to double check your work.

## Frequently asked questions about CalcRx

### What is CalcRx?

CalcRx is an outpatient prescription calculator designed to quickly determine dispense quantities and billable days supply for various medications. It simplifies complex calculations for common dosage forms and regimens.

### What types of prescriptions can CalcRx calculate?

CalcRx can calculate quantities for tablets/capsules, oral liquids, ear/eye drops, insulin, and warfarin. It also handles complex steroid tapers and other regimens.

### Does CalcRx have ads?

No, CalcRx does not contain advertisements. It offers a clean and focused user experience for medical professionals.

### What devices does CalcRx support?

CalcRx is available for iPhone, iPad, and iPod touch devices, allowing for flexible use across Apple's mobile ecosystem.

### How often is CalcRx updated?

The latest version of CalcRx is 2.1.0, and it was last updated on July 9, 2025. Updates typically include improvements and new features.

### What are the subscription options for CalcRx?

CalcRx offers subscription plans for full access, including a monthly option at $0.99 and a yearly option at $9.99. These plans provide ongoing access to all features.

### What is the age rating for CalcRx?

CalcRx has an age rating of 17+, indicating it is intended for mature users due to the nature of medical information and calculations.

### How accurate are CalcRx's calculations?

CalcRx is designed for fast and effortless calculation of dispense quantities and billable days supply. While it aims for precision, users should always cross-reference with official guidelines and professional judgment.

## Version history (last 5 releases)

### 2.1.0 — 2025-07-09

* now with a handy sig code / medical abbreviation reference!

### 2.0.1 — 2024-04-25

*Fixed a bug in the tabs/caps days supply calculator giving an incorrect results when using the '10 days' button.
* cleaned up the UI a bit

### 2.0.0 — 2023-12-13

* Newly refreshed user interface
* number of drops/mL to use for ear/eye drops is now customizable
* insulin now supports all major concentrations U-100, U-200, etc.

### 1.0.4 — 2020-11-03

Updates for compatibility with iOS 13 and above.  Better support for darkmode.  Minor bug fixes to the user experience.

### 1.0.3 — 2020-05-14

* Adds support for dark mode.
* Tab order is now saved between app launches
* Minor bug fixes

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## More apps by Dabbling Badger LLC

- [RxOrange](https://appshunter.io/ios/app/rxorange/id455874929)
- [OTC Assistant - over the counter drugs by symptom, brand name, or ingredient](https://appshunter.io/ios/app/otc-assistant-over-the-counter-drugs-by-symptom-brand-name-or-ingredient/id897662819)
- [Board Game Snapshot](https://appshunter.io/ios/app/board-game-snapshot/id1568778495)
- [Biosimilar](https://appshunter.io/ios/app/biosimilar/id1661974746)

All apps by Dabbling Badger LLC: https://appshunter.io/developer/455874932

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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 2026-08-31.*