# WhatEquation?

> WhatEquation? (iPhone/iPad app by ShattoChem Enterprises, LLC.)

- Source: https://appshunter.io/ios/app/whatequation/id6818525372 (this page in markdown: same URL + `.md`)
- Developer: [ShattoChem Enterprises, LLC](https://appshunter.io/developer/6806885132)
- Category: Reference
- Price: Free
- Age rating: 4+
- Requires: iOS 16.4 · 33 MB
- Languages: English
- Released: 2026-10-05
- Data updated: 2026-10-08

## What is WhatEquation??

Stop guessing which equation applies. Describe your problem in plain language; "pressure drop in rough pipe," "is this column going to buckle," "spring constant"; and WhatEquation? finds the right equation, fast.

HOW IT WORKS
Type what you're actually trying to solve, not a textbook formula name. WhatEquation? searches by meaning, not just keywords, so you don't need to remember the exact term to find what you need.

For every equation, you get:
- The formula itself, clearly formatted
- Key assumptions: know when the equation actually applies
- Every variable defined, with units
- NCEES handbook search terms, so you can cross-reference fast

WHAT'S COVERED
200+ equations across the disciplines engineers actually use day to day:

- Fluid Mechanics
- Heat Transfer
- Thermodynamics
- Mass Transfer
- Reaction Engineering
- Process Control
- Statics & Strength of Materials
- Electrical
- Engineering Economics
- Environmental
- Math & Physics fundamentals

BUILT-IN REFERENCE TOOLS
No need to switch apps mid-problem:
- Unit Conversions: pressure, flow, temperature, energy, and more
- Engineering Constants: universal, water, air, and physics constants, organized and searchable

WORKS OFFLINE. NO DATA COLLECTED.
WhatEquation? runs entirely on your device. No internet connection required, no account, no tracking, nothing sent anywhere. It's a reference tool, not a data collector.

WHO IT'S FOR
Built for working engineers, students studying for the FE or PE exam, and anyone who needs to go from "what's the right equation here?" to an answer in seconds, not twenty minutes of flipping through a handbook or searching the internet.

Download WhatEquation? and never lose time hunting for the right formula again.


## Version history (last 1 release)

### 1.0.0 — 2026-10-05

No release notes.

## More apps by ShattoChem Enterprises, LLC

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- [ShattoPrep FE](https://appshunter.io/ios/app/shattoprep-fe/id6806907092)
- [ShattoPrep ME PE](https://appshunter.io/ios/app/shattoprep-me-pe/id6808435366)
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- [ShattoPrep ENVE PE](https://appshunter.io/ios/app/shattoprep-enve-pe/id6808466593)

All apps by ShattoChem Enterprises, LLC: https://appshunter.io/developer/6806885132

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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 2026-10-08.*