Mechanical Engineering Toolkit

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About this app

Mechanical Engineering Toolkit is a professional engineering calculator for students, researchers, and practicing engineers. Choose a formula, enter your variables, and get instant results — with calculation steps, formulas, diagrams, and unit conversions shown along the way. Switch between SI and Imperial units anytime, save favorites, and find the right tool fast with recommendations by major.

Categories and tools:

Mechanics of Material
• Moments of inertia of plane areas
• Force-displacement relation of a bar
• Torsion formula and angle of twist
• Flexure formula of a beam
• Transverse shear stress
• Deflections and slopes of cantilever and simple beams
• Plane stress transformation and Mohr's circle
• Principal stresses and planes
• Spherical shell and thin-walled pressure vessel stresses
• Buckling load of a column
• Thermal deformation and stress
• Combined loading
• Bolted / riveted joints
• Fatigue safety factor
• Shaft power and torque

Statics
• Centroid of an area
• Resultant of a force system
• Beam reactions
• 2D truss analysis

Machine Design
• Helical compression springs
• Spur gear geometry and stresses
• Shaft fatigue design (DE-Goodman)
• Bearing L10 life
• Belt and chain drives
• Bolt preload / torque-tension
• Fillet weld strength
• Press / shrink-fit interference

Theory of Elasticity
• Constitutive relation of linear elastic material
• Stress/strain of linear elastic material

Composite Material
• Lamina and laminate stress/strain
• Lamina engineering constants
• Laminate plane and 3D properties
• Rule of mixtures
• Failure criteria (Tsai-Hill, Tsai-Wu)

Reference Tables
• Drill & tap chart (metric and imperial thread series)
• ISO 286 fits & tolerances
• Unit converter

No account required. Works offline. Available in English, Chinese, German, French, and Japanese.

What’s new

New in 1.9.0:

• Fluids & Thermal — a new category: Reynolds number, pipe pressure drop, pump and fan power, wall conduction, fin efficiency and heat exchanger sizing.
• Standard Sections — AISC W, IPE and HEB shapes with full properties. Fill a beam straight from a section.
• Built-in fluid and thermal material property lists.
• Fixed PDF export in Chinese and Japanese.