# Refrigerant Charge Calculator — HVACR Check PT Chart Superheat > HVAC/R refrigerant charge calculation and job management tool. (iPhone/iPad app by Mikhail Nikitin.) - Source: https://appshunter.io/ios/app/refrigerant-charge-calculator/id6762469018 (this page in markdown: same URL + `.md`) - Developer: [Mikhail Nikitin](https://appshunter.io/developer/1826368571) - Category: Utilities - Price: Free with in-app purchases - Rating: 4.40/5 from 10 App Store ratings - Age rating: 4+ - Requires: iOS 17.0 · 26 MB - Languages: American English, French (France), German (Germany), Brazilian Portuguese, European Spanish - Released: 2026-04-27 - Data updated: 2026-09-03 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/refrigerant-charge-calculator/id6762469018/reviews.md ## What is Refrigerant Charge Calculator? Refrigerant Charge Calculator — built for working HVAC and refrigeration techs. Open it at the condenser, pick the refrigerant, type your superheat or subcooling, and get a clear field verdict: Add, Hold, or Remove. No classroom theory. No 20-step wizards. Just the number you need, in the unit you work in. WHAT YOU CAN DO • Charge check by superheat — fixed-orifice, piston, or cap tube systems, with target ranges interpolated from indoor wet-bulb and outdoor dry-bulb • Charge check by subcooling — TXV and EEV systems, measured against the nameplate target • Line-set charge estimation — add-a-length and long-line corrections done in seconds • Pressure–Temperature reference — 1-psig precision, with bubble, dew, and mid-point readings for zeotropic blends (glide shown explicitly) • Altitude-corrected pressures — auto-detected from your location, or set the elevation by hand • Saved jobs — address and GPS coordinates tagged from the map • One-tap PDF job sheets — header, readings, verdict, notes — ready to email to the building owner, property manager, or warranty adjuster • Unit toggles everywhere — °F / °C, psig / bar, imperial / metric line sets • Fully offline — attics, basements, rooftop curbs, mechanical rooms with no signal REFRIGERANTS COVERED — 86 TOTAL A2L low-GWP (2025 compliant) R-32 · R-454A · R-454B · R-454C · R-452B · R-457A · R-1234yf · R-1234ze(E) · R-1234ze(Z) · R-1243zf · R-1336mzz(E) HFC workhorses R-410A · R-410B · R-134a · R-404A · R-407A · R-407C · R-407F · R-448A · R-449A · R-449B · R-452A · R-507A · R-513A · R-515B Legacy and service blends R-22 · R-11 · R-12 · R-123 · R-124 · R-125 · R-500 · R-502 · R-417A · R-421A · R-422A · R-422B · R-422C · R-422D · R-427A · R-438A · R-453A Naturals R-290 propane · R-600a isobutane · R-717 ammonia · R-744 CO₂ · R-1270 propylene Plus 30+ less-common 400-series blends you won't find on a pocket slider — full list browsable inside the app. REFRIGERANT DETAIL PAGES Every refrigerant comes with the data you actually look up on the job: • GWP and ASHRAE safety class • Tank color code • Occupational Exposure Limit (OEL) • Temperature glide for blends • Critical point and molecular weight • Common applications and replacement notes WHO IT'S FOR • Residential and light-commercial HVAC service techs • Refrigeration techs working supermarket R-744 racks and R-290 cases • A2L installers catching up on R-454B and R-32 • Apprentices studying for EPA 608 and ESCO certification • Shop owners who want every tech reading the same charge verdict WHY TECHS CHOOSE IT • Offline-first — calculations run on device, no spinning loader in a crawlspace • No account required — open the app, run the math, close the app • Verdict first, numbers after — the screen tells you what to do before making you scroll • Your jobs stay on your phone — nothing leaves the device without a tap from you • Built by listening to techs, not classroom instructors Privacy Policy: https://docs.nikitin.fyi/com.hvacrcharge.app/privacy-policy.html Terms of Service: https://docs.nikitin.fyi/com.hvacrcharge.app/terms-of-service.html ## Key features - Charge check by superheat - Charge check by subcooling - Line-set charge estimation - Pressure-Temperature reference - Altitude-corrected pressures - Saved jobs with GPS - One-tap PDF job sheets - Offline functionality ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | premium | $29.99 | per year | | premium | $4.99 | per month | ## Frequently asked questions about Refrigerant Charge Calculator ### What is the Refrigerant Charge Calculator used for? Refrigerant Charge Calculator is designed for HVAC and refrigeration technicians to quickly determine the correct refrigerant charge for systems. It provides a clear verdict (Add, Hold, or Remove) based on superheat or subcooling measurements, supporting a wide range of refrigerants and unit preferences. ### Does Refrigerant Charge Calculator work offline? Yes, Refrigerant Charge Calculator is fully offline. Calculations run on the device, making it usable in areas without a signal, such as attics, basements, or mechanical rooms. ### What refrigerants does Refrigerant Charge Calculator support? Refrigerant Charge Calculator supports 86 refrigerants, including A2L low-GWP refrigerants, HFC workhorses, legacy blends, and natural refrigerants like propane and CO₂. A full list is available within the app. ### Can I save job details with Refrigerant Charge Calculator? Yes, you can save jobs with Refrigerant Charge Calculator. It allows you to tag jobs with address and GPS coordinates from the map, and you can generate one-tap PDF job sheets to email to clients or managers. ### What are the unit conversion options in Refrigerant Charge Calculator? Refrigerant Charge Calculator offers unit toggles for temperature (°F / °C), pressure (psig / bar), and line-set measurements (imperial / metric). This ensures you can work with the units you are most familiar with. ### How does Refrigerant Charge Calculator handle altitude corrections? Refrigerant Charge Calculator can automatically detect your location to correct pressures for altitude, or you can manually set the elevation. This ensures accurate readings regardless of your job site's height. ### What is the pricing for Refrigerant Charge Calculator? Refrigerant Charge Calculator is free to download and use. It also offers subscription plans, with a premium tier available for $4.99 per month or $29.99 per year, including a 7-day free trial. ### What is the update frequency for Refrigerant Charge Calculator? Refrigerant Charge Calculator was last updated on April 27, 2026, with version 1.0. Based on this release date, it appears to be a newly launched application. ## Version history (last 1 release) ### 1.0 — 2026-04-27 No release notes. ## More apps by Mikhail Nikitin - [Call Santa: Video & Audio Chat](https://appshunter.io/ios/app/call-santa-video-and-audio-chat/id6756441338) - [EXIF Metadata Editor & Remover](https://appshunter.io/ios/app/exif-metadata-editor-and-remover/id6757008458) - [VinylSpot: Scan & Value Record](https://appshunter.io/ios/app/vinylspot-scan-and-value-record/id6757302378) - [Ductulator - Duct Calculator](https://appshunter.io/ios/app/ductulator-duct-calculator/id6757307937) - [Tip Calculator Splitsy](https://appshunter.io/ios/app/tip-calculator-splitsy/id6757361617) - [Wheel Spinner Random Decision](https://appshunter.io/ios/app/wheel-spinner-random-decision/id6758348513) All apps by Mikhail Nikitin: https://appshunter.io/developer/1826368571 ## Related topics [hvac charge check](https://appshunter.io/ios/topics/hvac-charge-check) · [radiator calculator pro](https://appshunter.io/ios/topics/radiator-calculator-pro) --- *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 2026-09-03.*