Engineering Formulas - EngiRef

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 an