# CVR Calc

> Calculates catheter to vessel ratios for vascular access and infusion therapy. (iPhone/iPad app by Global Vascular Access, LLC.)

- Source: https://appshunter.io/ios/app/cvr-calc/id1423744026 (this page in markdown: same URL + `.md`)
- Developer: [Global Vascular Access, LLC](https://appshunter.io/developer/1423744025)
- Category: Medical, Utilities
- Price: Free
- Rating: 3.30/5 from 26 App Store ratings · 6 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.5 · 4 MB
- Languages: American English
- Released: 2018-09-13
- Data updated: 2026-07-30
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/cvr-calc/id1423744026/reviews.md

## What is CVR Calc?

CVRCalc was designed by clinicians, for clinicians — and is the tool for healthcare professionals who work in or perform Vascular Access and Infusion Therapy roles and want to monitor accurate catheter to vessel ratios. It is designed to calculate the area consumed within the intravascular space used by the catheter. The device can be used to calculate the area for both venous and arterial devices if preferred.

This simple tool allows clinicians to make quick area-based calculations during the patient assessment process, along with using ultrasound to accurately measure the vessel size prior to the insertion of an intravascular device. It covers both peripheral intravenous devices (in both Gauge and French sizes) as well as central venous access devices (in French size only).

Based on the 1st Place poster awarded at the Association for Vascular Access 2017 Scientific Meeting in Phoenix and supported with an academic publication, which can be found here - https://doi.org/10.1007/s11239-017-1569-y

This App does NOT collect, record, store, or transmit any information entered, and is used to provide the mathematical catheter to vessel area-based calculations only.

## Key features

- Catheter to vessel ratio calculation
- Supports venous and arterial devices
- Peripheral and central venous access device calculations
- Area-based calculations for patient assessment
- Uses ultrasound measurements for vessel size
- Based on academic research and awards

## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/cvr-calc/id1423744026/reviews.md

### 2/5 — Catheter Size

*2025-09-17*

Catheter size disappears after closing the app and requires the app to be deleted and redownloaded.

### 1/5 — French size not available

*2025-05-24*

You have to delete and redownload for French and gauge size to appear… so strange!

### 2/5 — Improvements

*2025-05-08*

Would love for it to show cm, not mm. Also I find our team has to delete and redownload a lot to get gauge list to appear

### 5/5 — CVR Calc is great

*2024-08-07*

This app helps clinicians to get the correct ratio between catheter and vessel. 
Works great, simple to use and makes it alot easier than having to do that math manually.

### 3/5 — Inaccurate

*2024-04-18*

CVR calculations on top right = catheter to vein occupancy. There should be an option to change it and should be corrected

### 5/5 — Awesome!

*2019-02-26*

Great app that every Vascular Access Specialist should use to document CVR.

## Frequently asked questions about CVR Calc

### What is CVR Calc used for?

CVR Calc is used by clinicians to calculate the area consumed within the intravascular space by a catheter, helping to monitor accurate catheter to vessel ratios for vascular access and infusion therapy.

### What types of devices does CVR Calc support?

CVR Calc supports calculations for both peripheral intravenous devices (in Gauge and French sizes) and central venous access devices (in French size only).

### Does CVR Calc collect or store any patient data?

No, CVR Calc does not collect, record, store, or transmit any information entered. It is solely used for mathematical catheter to vessel area-based calculations.

### What is the rating for CVR Calc?

CVR Calc has a rating of 3.3 stars based on 26 ratings.

### On what devices can CVR Calc be used?

CVR Calc is supported on Mac, iPhone, and iPad devices.

### When was CVR Calc last updated?

CVR Calc was last updated on September 28, 2025, with version 2.0.3.

### Is CVR Calc free to use?

Yes, CVR Calc is available for free.

### Does CVR Calc have ads?

No, CVR Calc does not contain advertisements.

## Version history (last 5 releases)

### 2.0.3 — 2025-09-28

Small improvements to catheter sorting.

### 2.0.2 — 2025-09-19

This version of the app adds several new catheter sizes. You can also start a calculation from the Lock Screen or Control Center with a new widget and control.

### 2.0 — 2024-05-27

In this update, CVR Calc gets a fresh design that makes it easier for you to calculate a diameter or area ratio. Check out the visualizer to help you better understand your results. Need to go hands free? You can now use Siri or the Shortcuts app to calculate a CVR.

### 1.0.1 — 2018-09-15

This version contains some small fine tunings to provide more accurate calculations.

### 1.0 — 2018-09-13

No release notes.

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## Related topics

[vascular access](https://appshunter.io/ios/topics/vascular-access) · [victron smart shunt](https://appshunter.io/ios/topics/victron-smart-shunt)

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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 2026-07-30.*