Engineering calculators
Browse every EngiToolbox engineering calculator — stress, beams, vibration, machining, electronics and more. Most tools are completely free; Pro unlocks exports, saves and advanced solvers.
Free Fully freeFree + Pro Free core, Pro extrasPro Pro solver
Strength & structures
Beams, stress, sections, and pressure vessels.
- Beam stress & deflectionFree + ProAnalyse beams with custom supports and loads. Visualise the deflected shape and aligned shear force, bending moment, bending stress and deflection diagrams using a finite element solver.
- Stress calculatorFree + ProCalculate stress in materials under different loading conditions, including axial, bending, torsional, and combined stresses.
- Moment of inertiaFree + ProCalculate the second moment of area for common beam and structural cross-sections.
- Hoop stressFree + ProCalculate hoop and longitudinal stress in thin-walled pressure vessels and pipes.
- Young's modulusFreeCalculate Young's modulus from stress and strain data for material characterization.
Motion & vibration
Forces, resonance, damping, and kinematics.
- Centrifugal forceFreeCalculate centrifugal force on rotating masses and components.
- ResonanceFree + ProCalculate natural frequencies and resonance conditions for mechanical systems.
- DampingFree + ProCalculate damping ratios and coefficients for vibration analysis.
- SUVATFreeSolve kinematics problems using displacement, velocity, acceleration, and time equations.
- FrictionFreeCalculate friction forces, normal forces, and coefficients of friction for engineering applications.
Applied & shop tools
Machining, seals, fits, and thermal growth.
- Speeds & feedsFree + ProCalculate spindle speed and feed rates for milling and turning operations based on material and tool data.
- Drill point depthFreeCalculate drill point depth and full hole depth for standard drill point angles.
- O-ring calculatorProSize and validate O-ring groove dimensions and compression for sealing applications.
- Limits and fitsFree + ProCalculate ISO tolerance limits and fits for shaft and hole combinations.
- Thermal expansionFreeCalculate linear thermal expansion for engineering components and assemblies.
Electronics
Circuits, networks, and passive components.
- Voltage dividerFreeCalculate output voltage and resistor values for voltage divider circuits.
- RC time constantFreeCalculate RC circuit time constants, charge, and discharge times.
- Resistor networkFreeCalculate equivalent resistance for series, parallel, and mixed resistor networks.
- Capacitor networkFreeCalculate equivalent capacitance for series and parallel capacitor networks.
General engineering
Units, materials, and geometry helpers.
- Unit conversionFreeConvert between common engineering units for length, force, pressure, torque, and more.
- Materials referenceFreeBrowse engineering material properties including density, strength, and thermal data.
- TrigonometryFreeSolve triangle problems and trigonometric calculations for engineering layouts.
- PCD calculatorFreeCalculate pitch circle diameter and hole positions for bolt circle patterns.
- Punch & die clearanceFree + ProCalculate recommended punch-to-die clearance for sheet metal stamping operations.
Need exports, saved projects, or API access?
Every calculator is usable for free. Upgrade to Pro or Team for ad-free browsing, branded PDF exports, unlimited saved calculations, advanced solver modes, and the calculation API.
View plans