Refrigerant Charge Calculator

HVACR Check PT Chart Superheat

Free · In‑App Purchases

Now with 86 refrigerants — A2L R-454B and R-32 ready, R-717 ammonia, R-744 CO₂, all the 400-series blends. One-tap verdict: Add, Hold, Remove. Offline. No account. 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

Ratings & Reviews

  • 4.6
    out of 5
    9 Ratings

The developer, Mikhail Nikitin, 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 Linked to You

    The following data may be collected and linked to your identity:

    • Purchases
    • Identifiers

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • Mikhail Nikitin
Size
  • 26.8 MB
Category
  • Utilities
Compatibility
Requires iOS 17.0 or later.
  • iPhone
    Requires iOS 17.0 or later.
  • iPad
    Requires iPadOS 17.0 or later.
Languages
English and 4 more
  • English, French, German, Portuguese, Spanish
Age Rating
4+
In-App Purchases
Yes
Copyright
  • © Mikhail Nikitin
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

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