EngiRef - 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 70+ 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 35+ engineering materials including carbon steels, stainless steels, aluminum alloys, titanium, copper, plastics, composites, concrete, and wood. Compare up to 4 materials side-by-side with density, tensile strength, elastic modulus, thermal conductivity, and more.

REFERENCE TABLES
• Bolt specifications: Metric M3-M30, SAE/Imperial sizes with torque specs
• Pipe schedules: NPS dimensions, wall thickness, and weight
• 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.

PHYSICAL CONSTANTS
Quick reference for fundamental constants: 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. Great for FE and PE exam preparation.

ADDITIONAL FEATURES
• Dark and light themes (follows system setting)
• Favorites to bookmark frequently used formulas
• Calculation history with timestamps
• Create and save custom formulas (up to 50)
• Export and import your data
• Responsive across phones and tablets
• Material Design interface

PRIVACY FOCUSED
EngiRef collects zero personal data. No analytics, no tracking, no ads. All your calculations and favorites stay on your device.

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.