# calc318 — ACI 318-19 Equation Calculator

> ACI 318-19 Equation Calculator (iPhone/iPad app by ARTIFICIAL INTELLIGENCE OPTIMIZATION AND SOFTWARE AIOS LLC.)

- Source: https://appshunter.io/ios/app/calc318/id6763030413 (this page in markdown: same URL + `.md`)
- Developer: [ARTIFICIAL INTELLIGENCE OPTIMIZATION AND SOFTWARE AIOS LLC](https://appshunter.io/developer/1835191566)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.0 · 17 MB
- Languages: American English
- Released: 2026-06-22
- Data updated: 2026-07-09
- User reviews in markdown: https://appshunter.io/ios/app/calc318/id6763030413/reviews.md

## What is calc318?

Solve all 175 equations from ACI 318-19 Appendix C, instantly, in US Customary Units.

Calc318 turns the equations from ACI 318-19 Appendix C into a live calculator. Pick an equation, enter your parameters, and get an answer the moment you type — beautifully rendered, with every variable clearly defined and unit-aware. No spreadsheets, no hand calcs.

calc318 requires an auto-renewable subscription. Start your 7-day free trial — no charge until the trial ends, and you can cancel anytime. After the trial, your subscription continues at $12.99/year or $2.99/month. Manage or cancel anytime in Settings → Apple ID → Subscriptions.

See more than just a number. Tap any input to open an interactive chart that shows exactly how your result responds as that parameter changes — with a draggable point and a family of curves for the other key variables, so you understand the behavior of the equation, not just one data point.

FEATURES:
- Live computation for all 175 ACI 318-19 equations, fully unit-aware.
- Professionally formatted equations with LaTeX-quality rendering.
- Interactive sensitivity graphs — drag a point and watch the result update in real time.
- Compare curves across multiple parameter values to see trends at a glance.
- Complete variable descriptions and units for every input.
- Smart search by section number, chapter, keyword, or variable.
- Recents tab to jump back to equations you use most.
- Clean, intuitive interface designed for engineers.

Whether you're checking a calculation, running a quick sensitivity study, or referencing design provisions, calc318 gets you the answer — and the insight behind it — in seconds.

Privacy Policy: https://aiosciv.com/calc318/
Terms of Use (EULA): http://www.apple.com/legal/itunes/appstore/dev/stdeula

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| calc318 Pro Yearly | $12.99 | per year |
| calc318 Pro Monthly | $2.99 | per month |



## Version history (last 1 release)

### 1.0 — 2026-06-22

No release notes.

## More apps by ARTIFICIAL INTELLIGENCE OPTIMIZATION AND SOFTWARE AIOS LLC

- [search318](https://appshunter.io/ios/app/search318/id6751448696)

All apps by ARTIFICIAL INTELLIGENCE OPTIMIZATION AND SOFTWARE AIOS LLC: https://appshunter.io/developer/1835191566

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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 2026-07-09.*