# FieldCalc — HVAC/R Field Calculator

> HVAC/R Field Calculator (iPhone/iPad app by Marwane Tchassama.)

- Source: https://appshunter.io/ios/app/fieldcalc/id6787528767 (this page in markdown: same URL + `.md`)
- Developer: [Marwane Tchassama](https://appshunter.io/developer/1801821855)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 5 MB
- Languages: American English
- Released: 2026-07-09
- Data updated: 2026-07-25
- User reviews in markdown: https://appshunter.io/ios/app/fieldcalc/id6787528767/reviews.md

## What is FieldCalc?

FieldCalc is the only calculator an HVAC/R technician needs on a service call. Every daily calculation in one fast, modern, fully offline app — no subscription, no clutter.

CALCULATIONS
- PT Chart — saturation pressure and temperature for R-410A, R-32, R-22, R-134a, and R-407C, with instant analog gauge readout
- Superheat — suction line superheat with flooding warnings
- Subcooling — liquid line subcooling with flash gas warnings
- Duct Sizer — equal-friction round and rectangular duct sizing (ACCA Manual D / ASHRAE), with velocity limit warnings
- Delta-T / Sensible Load — sensible BTU/hr and required airflow, with tonnage and metric conversions

WHY FIELDCALC
- Works 100% offline — no signal needed on the roof or in the basement
- Imperial and metric units on every screen
- Modern, high-contrast interface built for the field
- Fast — open, calculate, done
- No account, no subscription

Built on trusted engineering sources: CoolProp thermodynamic data, ACCA Manual D, and ASHRAE Fundamentals.

FieldCalc is a reference tool for qualified HVAC/R professionals. Always verify results against equipment manufacturer specifications and applicable codes.


## Version history (last 1 release)

### 1.0 — 2026-07-09

No release notes.

## More apps by Marwane Tchassama

- [OkeyScore](https://appshunter.io/ios/app/okeyscore/id6744269302)
- [İkimiz Arasında](https://appshunter.io/ios/app/ikimiz-arasnda/id6757119704)
- [Lunara - Rüya Günlüğü](https://appshunter.io/ios/app/lunara-ruya-gunlugu/id6761691086)
- [Lunea - Özgür Nefes](https://appshunter.io/ios/app/lunea-ozgur-nefes/id6762097693)
- [Calmly: Breathing & Calm](https://appshunter.io/ios/app/calmly-breathing-and-calm/id6778544425)

All apps by Marwane Tchassama: https://appshunter.io/developer/1801821855

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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 2026-07-25.*