RefCalc: Refrigerant PT Chart
Superheat & Subcooling Calc
Only for iPhone
$1.99 · Designed for iPhone. Not verified for macOS.
iPhone
Instant PT chart, superheat & subcooling for every refrigerant — now with A2L R-32, R-454B, R-452B. One-time purchase, fully offline, no ads.
RefCalc is the fast, offline Pressure–Temperature chart and Superheat/Subcooling calculator built for HVAC/R technicians — no subscription, no ads, one-time purchase.
CHECK CHARGE IN SECONDS
Enter suction pressure and suction line temperature to get instant superheat. Enter liquid line pressure and temperature to get instant subcooling. Color-coded results show at a glance whether you're in range.
FULL PT CHART, ANY REFRIGERANT
Type a pressure, get the saturation temperature. Type a temperature, get the saturation pressure. For blend refrigerants, RefCalc shows both bubble point and dew point plus the glide between them — the detail cheap PT apps get wrong.
BUILT-IN REFRIGERANTS
R-410A, R-32, R-454B, R-452B, R-22, R-134a, R-404A, R-407C, R-448A/R-449A, R-290, R-1234yf, R-513A — including the newer A2L mildly-flammable refrigerants (R-32, R-454B, R-452B) that older apps don't support.
WORKS YOUR WAY
• psi / bar / kPa / MPa
• Gauge (psig) or absolute (psia) reference
• °F or °C
• 7 languages: English, Spanish, Chinese, Portuguese, Japanese, Korean, Vietnamese
100% OFFLINE
No account, no internet permission, no analytics, no ads. Your data stays on your device. Buy once, use forever.
Refrigerant data sourced from NIST REFPROP and manufacturer/ASHRAE published PT charts. RefCalc provides the math — always confirm final charge against the equipment nameplate or OEM charging chart.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Duong Nguyen Huu, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Duong Nguyen Huu
- Size
- 32.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Gnouden 2026
