# Engineering Formulas - EngiRef — Materials, Units & Quiz Mode

> Materials, Units & Quiz Mode (iPhone/iPad app by Mobin Akhter.)

- Source: https://appshunter.io/ios/app/engineering-formulas-engiref/id6758258119 (this page in markdown: same URL + `.md`)
- Developer: [Mobin Akhter](https://appshunter.io/developer/1812505286)
- Category: Education, Reference
- Price: Free with in-app purchases
- Age rating: 12+
- Requires: iOS 15.1 · 45 MB
- Languages: American English, Arabic, Czech, Danish, Dutch, Finnish, French (France), German (Germany), Greek, Hebrew and 20 more
- Released: 2026-02-05
- Data updated: 2026-08-18
- User reviews in markdown: https://appshunter.io/ios/app/engineering-formulas-engiref/id6758258119/reviews.md

## What is Engineering Formulas?

EngiRef is the all-in-one engineering reference app that works 100% offline. Access formulas, material properties, reference tables, and a powerful unit converter - all without internet connection.

FORMULA LIBRARY
Browse 140+ essential engineering formulas organized by discipline:
• Mechanical Engineering: stress, strain, torque, power, gear ratios, spring design
• Electrical Engineering: Ohm's law, AC/DC circuits, impedance, resonance
• Civil/Structural: beam deflection, Euler buckling, Manning's equation
• Thermodynamics: ideal gas law, Carnot efficiency, heat transfer
• Fluid Mechanics: Bernoulli, Reynolds number, Darcy-Weisbach
• Materials Science: Young's modulus, Poisson's ratio, fatigue analysis

BUILT-IN CALCULATOR
Enter your values and get instant results. Every calculation shows step-by-step solutions so you understand the process, not just the answer. Perfect for learning and exam preparation.

MATERIALS DATABASE
Access properties for 55+ engineering materials:
• Carbon steels (AISI 1018, 1045, 4140, 4340)
• Stainless steels (304, 316, 17-4 PH)
• Aluminum alloys (6061-T6, 7075-T6, 2024-T3)
• Titanium, copper, nickel alloys
• Plastics (ABS, HDPE, Nylon, PEEK, Delrin)
• Composites, concrete, and wood

Compare up to 3 materials side-by-side with density, tensile strength, elastic modulus, thermal conductivity, and more.

REFERENCE TABLES
• Bolt specifications: Metric M3-M36, SAE/Imperial sizes
• Pipe schedules: NPS dimensions and wall thickness
• Wire gauges: AWG 0000-40 with ampacity ratings

UNIT CONVERTER
Convert between 16 categories including length, pressure, temperature, force, energy, flow rate, and viscosity. Accessible from any screen via slide-over panel.

PHYSICAL CONSTANTS
Quick reference for 34 constants including speed of light, gravitational constant, Boltzmann constant, Avogadro's number, and more.

QUIZ MODE
Test your knowledge with flashcard-style quizzes. Track progress across all disciplines. Prepare for FE and PE exams.

ADDITIONAL FEATURES
• Dark and light themes (follows system setting)
• Favorites to bookmark frequently used formulas
• Calculation history with timestamps
• Create and save custom formulas
• Export and share your data
• LaTeX formula rendering
• iPad-optimized layouts

PRIVACY FOCUSED
EngiRef collects zero personal data. No analytics, no ads. All your calculations and favorites stay on your device. We believe engineering tools should respect your privacy.

Whether you are a student preparing for exams, a working engineer needing quick field reference, or a technician looking for material specs, EngiRef puts essential engineering knowledge in your pocket.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Yearly Premium | $29.99 | per year |
| Weekly Premium | $4.99 | per 7 days |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Access | $54.99 | one-time |



## Version history (last 3 releases)

### 1.1.0 — 2026-06-02

Content improvement, minor fixes

### 1.0.1 — 2026-04-15

General UI/UX improvements and performance fixes for a smoother experience

### 1.0 — 2026-02-06

No release notes.

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| --- | --- | --- | --- |
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All apps by Mobin Akhter: https://appshunter.io/developer/1812505286

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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 2026-08-18.*