--- title: "Engineering Formulas - EngiRef - Reviews, Revenue and Downloads in United States | Apple App Store" description: "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. F" --- # Engineering Formulas - EngiRef — United States > Materials, Units & Quiz Mode ![Engineering Formulas App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/1a/ae/40/1aae4014-ed25-48bc-d97e-38469ff3207b/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png) **Developer:** [Mobin Akhter](https://apptail.io/developer/mobin-akhter-zmeri) **Category:** Education **Rating:** N/A (0 ratings) **Price:** Free **Bundle ID:** com.mobinmoakhter.engiref **Store:** Apple App Store **Country:** United States **Version:** 1.1.0 (released 2026-06-02) **Original Release:** 2026-02-05 **Languages:** English, Arabic, Czech, Danish, Dutch, Finnish, French, German, Greek (modern), Hebrew (modern), Hungarian, Indonesian, Italian, Japanese, Korean, Latvian, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Chinese, Slovak, Slovenian, Spanish, Swedish, Thai, Turkish, Ukrainian, Vietnamese **App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6758258119) **AppTail Page:** [https://apptail.io/app/engineering-formulas-engiref-XWzy/united-states](https://apptail.io/app/engineering-formulas-engiref-XWzy/united-states) ## Engineering Formulas Description 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: ## Engineering Formulas Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/75/63/f2/7563f2f0-1f85-e6f5-8449-0758d69154a2/Simulator_Screenshot_-_iPhone_16_Pro_-_2026-02-04_at_19.05.22.png/1242x2688.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/ff/28/9d/ff289dab-31be-4283-735d-4ae17a957ee8/Simulator_Screenshot_-_iPhone_16_Pro_-_2026-02-04_at_19.05.30.png/1242x2688.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/71/39/34/71393444-43b6-ab86-7bb1-04c0ac3ad1e7/Simulator_Screenshot_-_iPhone_16_Pro_-_2026-02-04_at_19.08.49.png/1242x2688.png) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/bf/27/9d/bf279dd0-0c2d-8b73-8fdb-3d542a2a5fda/Simulator_Screenshot_-_iPhone_16_Pro_-_2026-02-04_at_19.09.15.png/1242x2688.png) - [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/98/b4/87/98b487fd-f101-f48f-b97d-f4f49a1b14bd/Simulator_Screenshot_-_iPhone_16_Pro_-_2026-02-04_at_19.08.46.png/1242x2688.png) - [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/b9/cf/63/b9cf63ae-39d8-3e68-dd95-36c11f9b27ca/Simulator_Screenshot_-_iPhone_16_Pro_-_2026-02-04_at_19.16.49.png/1242x2688.png) - [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/e4/f9/c3/e4f9c33e-08be-6766-0d3d-c9ca8ecf840a/Simulator_Screenshot_-_iPhone_16_Pro_-_2026-02-04_at_19.17.17.png/1242x2688.png) - [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/a3/bb/f4/a3bbf463-6c6f-81bc-5d6a-d08bdd79b8ac/Simulator_Screenshot_-_iPhone_16_Pro_-_2026-02-04_at_19.09.26.png/1242x2688.png) - [Screenshot 9](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/b0/d6/c2/b0d6c2f8-652e-d6c1-be7b-664f53a72729/Simulator_Screenshot_-_iPhone_16_Pro_-_2026-02-04_at_19.08.57.png/1242x2688.png) ## Engineering Formulas In-App Purchases | Item | Price | |------|-------| | Weekly Premium | $1.99 | | Yearly Premium | $14.99 | | Lifetime Access | $29.99 | ## Engineering Formulas Available In - 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