# P-T Calculator — user reviews

> 9 indexed App Store user reviews of P by National Refrigerants Inc., rated 4.80/5 from 52 ratings.

- Source: https://appshunter.io/ios/app/p-t-calculator/id1252176525/reviews
- App overview in markdown: https://appshunter.io/ios/app/p-t-calculator/id1252176525.md
- Rating breakdown: 5★ 49 · 4★ 1 · 3★ 0 · 2★ 0 · 1★ 2

## Most critical reviews (9 lowest-rated)

### 4/5 — Good App needs R454B support

*2023-03-22*

Good handy application, needs to add R-454B support in list of refrigerants.

### 5/5 — Best P-T app available

*2021-05-12*

Makes life easy when working on HVACR systems!

### 5/5 — Easy to use!

*2020-05-03*

The gauges I bought have saturated temps in Celsius while everything else I have is in Fahrenheit! This app made the process super easy as well as automating the simple math to calculate Subcool/Superheat values.

### 5/5 — Tiny

*2018-05-02*

Best PT chart out there!!! Really helpful with my daily work load.

### 5/5 — Great app!

*2018-05-01*

Great app!

### 5/5 — Great Tool

*2018-05-01*

Great tool with many features most P-T apps don’t have. Helps show glide and calculates superheat / subcooling and many other helpful things.

### 5/5 — Best app for blend refrigerants

*2018-05-01*

Have used this app a few times servicing new high glide refrigerant systems and it works great. It compensates for changes in glide temperatures which is very helpful for new refrigerants

### 5/5 — Best P-T app!

*2018-05-01*

Best P-T app! Easy to understand, great graphics to understand glide

### 5/5 — PT Chart

*2018-05-01*

Simply the best out there. Just download it already thank me later.

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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 2026-08-26.*