---
title: "P-T Calculator - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "This comprehensive Pressure/Temperature calculation tool from National Refrigerants provides several unique features designed to make the HVAC/R technician’s job easier. This app can calculate a simpl"
---

# P-T Calculator — United States

![P-T Calculator App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/59/a3/6d/59a36dee-162c-0d5b-367a-535bcdbc88bb/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.jpeg/400x400bb.jpg)

**Developer:** [National Refrigerants](https://apptail.io/developer/national-refrigerants-kfze)
**Category:** Reference
**Rating:** 4.8/5 (52 ratings)
**Price:** Free
**Bundle ID:** skasperson.NRI-Calculator
**Store:** Apple App Store
**Country:** United States
**Version:** 1.31 (released 2026-08-21)
**Original Release:** 2018-01-04

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1252176525)
**AppTail Page:** [https://apptail.io/app/p-t-calculator-Lati/united-states](https://apptail.io/app/p-t-calculator-Lati/united-states)

## P-T Calculator Description
This comprehensive Pressure/Temperature calculation tool from National Refrigerants provides several unique features designed to make the HVAC/R technician’s job easier. This app can calculate a simple pressure/temperature relationship or calculate superheat/subcool temperatures. The user can input pressure or temperature(s) on any screen and the other values are automatically calculated and displayed. For refrigerant blends, both saturated vapor and saturated liquid values are displayed. Within the superheat/subcool screen, a graphic display for blends will show the entering, mid-point, and outlet temperature as well as line temperature. 

Other features include:
-  Automatic altitude correction (if location services are enabled)
-  English/Metric units
-  Easily choose from “favorites” refrigerants list
-  Supplementary information about refrigerants and links to NRI website
-  Link to NRI Lubricant Cross Reference app
-  Link to NRI Branch Locator tool

## P-T Calculator Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/f8/9c/e5/f89ce513-7073-34b7-d2a8-bd1189b360a2/pr_source.png/1242x2688.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/60/54/62/60546286-7fc3-525e-ae62-99c3838bcf13/pr_source.png/1242x2688.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/6b/6b/a1/6b6ba142-4510-51ad-0ba3-f99806f564e0/pr_source.png/1242x2688.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/c9/49/d5/c949d508-2de2-0084-2220-5d0b308b41eb/pr_source.png/1242x2688.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/e2/15/2a/e2152a9f-ead1-84a3-4da4-8c2ace6fcbde/pr_source.png/1242x2688.png)

## P-T Calculator Rating Breakdown in United States
- 5 stars: 49 (94%)
- 4 stars: 1 (2%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 2 (4%)

## P-T Calculator Reviews in United States

### ****- "Good App needs R454B support"
Good handy application, needs to add R-454B support in list of refrigerants.
-- Mastercage, 2023-03-22

### ***** "Best P-T app available"
Makes life easy when working on HVACR systems!
-- Joepel8, 2021-05-12

### ***** "Easy to use!"
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.
-- Moo surfer, 2020-05-03

### ***** "Tiny"
Best PT chart out there!!! Really helpful with my daily work load.
-- Tiny504, 2018-05-02

### ***** "Great app!"
Great app!
-- ggalland, 2018-05-01

### ***** "Great Tool"
Great tool with many features most P-T apps don’t have. Helps show glide and calculates superheat / subcooling and many other helpful things.
-- the amdrew, 2018-05-01

### ***** "Best app for blend refrigerants"
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
-- Wesley Branchik, 2018-05-01

### ***** "Best P-T app!"
Best P-T app! Easy to understand, great graphics to understand glide
-- Mareen12345, 2018-05-01

### ***** "PT Chart"
Simply the best out there. Just download it already thank me later.
-- XGlennBx, 2018-05-01

[View all P-T Calculator reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)



## P-T Calculator Discovered Keywords
- p
- t calculator

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## P-T Calculator Available In
- [United States](https://apptail.io/app/p-t-calculator-Lati/united-states)
- [Canada](https://apptail.io/app/p-t-calculator-Lati/canada)

---

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