Engineering Formulas - EngiRef
Materials, Units & Quiz Mode
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
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/
Ratings & Reviews
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General UI/UX improvements and performance fixes for a smoother experience
The developer, Mobin Akhter, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
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Information
- Seller
- Mobin Akhter
- Size
- 42.6 MB
- Category
- Education
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- In-App Purchases
Yes
- Weekly Premium $1.99
- Yearly Premium $14.99
- Lifetime Access $29.99
- Copyright
- © 2026 Mobin Akhter. All rights reserved.