# Architect's Formulator > Professional calculator app with over 2,000 formulas for construction and engineering. (iPhone/iPad app by Historycentral.com.) - Source: https://appshunter.io/ios/app/architects-formulator/id310925486 (this page in markdown: same URL + `.md`) - Developer: [Historycentral.com](https://appshunter.io/developer/1744330560) - Category: Business, Productivity - Price: Free with in-app purchases (on sale, was $9.99) - Rating: 2.00/5 from 2 App Store ratings · 10 written reviews indexed - Age rating: 4+ - Requires: iOS 18.6 · 37 MB - Languages: American English - Released: 2009-04-08 - Data updated: 2026-08-14 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/architects-formulator/id310925486/reviews.md ## What is Architect's Formulator? ARCHITECT'S FORMULATOR is the ultimate professional calculator for architects, engineers, and construction professionals — with over 2,000 formulas in a single app. Whether you're sizing beams, designing HVAC systems, calculating voltage drops, or checking ADA compliance, Architect's Formulator covers every discipline — structural, electrical, mechanical, plumbing, and carpentry — plus unit conversions, reference tables, and ADA accessibility resources. ARCHITECTURE & STRUCTURAL — 29 categories covering beam loads across single through four continuous spans, concrete design, flat plate analysis, steel design, masonry, environmental loads (wind, snow, seismic), foundation and retaining walls, wood design, acoustic absorption, 100+ material weights, fire egress, roof drainage, solar/daylighting, thermal performance, site grading, cost estimating, and more. ELECTRICAL — 15 categories for AC/DC circuits, Ohm's Law, motors, transformers, voltage drop, wiring/conduit sizing, batteries, impedance, power demand, lighting design, UPS sizing, and operating costs. CARPENTRY — 8 categories for lumber, stairs, safe beam loads, wall loads, roofing (shed, gable, hip), railing/deck framing, crown molding, and materials estimation for drywall, concrete, paint, and plywood. PLUMBING & HVAC — 29 categories covering pipe sizing, water flow, pumps, boilers, and a comprehensive HVAC library including airside/waterside heat transfer, duct sizing, fan and pump laws, gas laws, psychrometrics, refrigeration, heating/cooling load design, energy content for 16 fuel types, ventilation rates per ASHRAE 62.1, and steam/hydronic systems. CONVERSIONS — 17 categories with 500+ conversions for pressures, flows, BTU, horsepower, watts, frequency, linear/liquid/square/cubic measures, weights, and a Metric library with 280+ conversions across length, area, volume, mass, energy, power, and more. TEMPERATURE SCALES — Convert between all 8 scales: Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Newton, Delisle, and Rømer. REFERENCE TABLES — IBC Occupancy Loads, Brick Sizes, Lumber Dimensions, AWG Wire Gauge, Concrete Mix Ratios, and Insulation R-Values. ADA REFERENCE — 50 illustrated diagrams for wheelchair clearances, ramps, grab bars, elevators, accessible parking, and restroom layouts, plus 17 PDF documents with full ADA guidelines. FEATURES: • Over 2,000 professional formulas • US and Metric units with one-tap switching • Save and export calculations • Favorite your most-used calculators • One-time premium upgrade — no subscriptions From foundation to finish, every formula for every phase of the job. ## Key features - Over 2,000 professional formulas - US and Metric unit conversions - Save and export calculations - Favorite frequently used calculators - Reference tables and ADA guidelines ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Pro Version | $5.99 | one-time | ## Recent user reviews (10 of 10) All indexed reviews: https://appshunter.io/ios/app/architects-formulator/id310925486/reviews.md ### 1/5 — Mr *2016-11-27* Absolute waste of money ### 1/5 — Mr *2011-08-27* I should have read what other reviewers said about these products, but no! I had to waste my money. These people don t have the slightest idea about what they are doing. Just copying some formulas from a book without regard to units or purpose. ### 4/5 — Great, but where are all the missing bits? *2009-08-14* For what it does it seems great, however I am missing lots of things. 1) most of the calculations do not indicate the units I am supposed to enter, is the length feet, inches, yards etc. 2) electrical, I would love to see all the NEC tables, for example in the conduit size calc I Ned to be able to select size and cable type from the normal list (16gage THHN) the current calc only works if I know the pursue size of each cable (they are in the tables, why not use it) now I know NEC get updated every few years so if it cannot be include then wy not a new app? I would pay for it; conduit fill, box fill, all the tables from the standard. ### 2/5 — What about the rest of the world? *2009-08-13* Obviously geared towards architects in the USA only. Lack of metric tools to an otherwise very useful app. I have emailed the developer in the past about this and I have a feeling they don't really care. ### 1/5 — the worst of the worst *2009-07-16* How anyone could screw up an idea this simple this badly, I have no idea. The vast majority of the formulae are of no use to practicing architects, but that hardly even matters because there are errors and inconsistencies everywhere. Many of the formulas don't even use units, rendering them completely useless. Those that do use units, use them inconsistently. Many words are misspelled, the grammar is poor, and the "formula definitions" are often so vague as to be laughable. I wouldn't trust it to add two single-digit numbers. I deleted it within an hour of installing it. ### 1/5 — Caution *2009-06-20* Full of errors, incorrect units and spelling mistakes affecting content - nice idea - poor construction ### 1/5 — Architect Formulator review *2009-04-15* Purchased this but unfortunately let down - probably only any use to a structural engineer, no general formulae, and even then limited to about 20 items. Very disappointed. ### 3/5 — Good start... *2009-04-14* I understand it is impossible to make the apps for every architect needs. I think there are lots of calculations for electrical work but not for HVAC. I hope there will be some calculations to find rectangular and circular duct size, and the chart for the equivalance between them. Also it will be really nice if it has some information from IBC such as occupant load, outdoor air requirement, air balance calculation, and so on. Then you can give us update information as the building code updates in years. Thanks. ### 3/5 — Needs Refinement *2009-04-12* Not a bad app, but it needs polishing. As is it contains several spelling errors. The formual definitions could be fleshed out a bit more...define each component of the formula more precisely, including which units are employed. For example, under the HVAC section, in Heat Loss, one of the items to enter is "Radiation Value". Is that U factor or R value? Not everyone who may use this app is thoroughly versed in every parameter required for a formula to work, but if they are defined in the app, the user can then know what information is needed or lacking more precisely. This app can be a teaching tool as well as for one who knows the formulas but wants an easy way to use them. I'd give it higher stars pending needed upgrades. ### 4/5 — Very Nice *2009-04-09* It could use some more bells and whistles like code research or ADA information. Over all a must have for the intern and the old man boss! ## Frequently asked questions about Architect's Formulator ### What is Architect's Formulator? Architect's Formulator is a professional calculator app designed for architects, engineers, and construction professionals. It provides access to over 2,000 formulas covering various disciplines like structural, electrical, mechanical, and plumbing. ### How many formulas are included in Architect's Formulator? Architect's Formulator includes over 2,000 professional formulas to assist with a wide range of calculations for different engineering and construction needs. ### Does Architect's Formulator support both US and Metric units? Yes, Architect's Formulator supports both US and Metric units, allowing for easy switching between systems with a single tap for global usability. ### Can I save or export my calculations with Architect's Formulator? Yes, the app allows users to save their calculations for future reference and also provides the functionality to export them. ### What disciplines does Architect's Formulator cover? Architect's Formulator covers structural, electrical, mechanical, plumbing, carpentry, and HVAC disciplines, along with unit conversions and reference tables. ### What is the price of Architect's Formulator? Architect's Formulator is a paid app with a one-time purchase price of $9.99. It does not involve any subscriptions. ### What devices is Architect's Formulator compatible with? Architect's Formulator is available for Mac, iPhone, and iPad, offering a cross-platform solution for professionals. ### How often is Architect's Formulator updated? The app was last updated on March 22, 2026, indicating a commitment to ongoing development and maintenance. The latest version is 5.02. ## Version history (last 5 releases) ### 5.1 — 2026-08-09 Better handling of Metric vs Imperial ### 5.02 — 2026-03-22 Minor bug fixes ### 5.01 — 2026-03-16 Bug fixes ### 5.0 — 2026-02-27 Totally rewritten code base. Hundreds of additional formulas ability to save multiple results ### 3.9 — 2013-07-31 Additional sections on soil, frequency, and piping ## More apps by Historycentral.com - [Finance Formulator](https://appshunter.io/ios/app/finance-formulator/id294194640) - [Personal Formulator](https://appshunter.io/ios/app/personal-formulator/id296173495) - [Electrical Formulator](https://appshunter.io/ios/app/electrical-formulator/id299749412) - [Plumbing Formulator](https://appshunter.io/ios/app/plumbing-formulator/id303497783) - [Carpentry Formulator](https://appshunter.io/ios/app/carpentry-formulator/id305583131) - [Builder's Formulator](https://appshunter.io/ios/app/builders-formulator/id306247596) All apps by Historycentral.com: https://appshunter.io/developer/1744330560 --- *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 2026-08-14.*