AutoEngCalc - Engineering Calculators

Free Online Engineering Calculators (Mechanical, Civil, Electrical & More)

Precision computational solutions for modern engineering challenges. Fast, accurate, and reliable calculations for professionals and students.

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561.741

Engineering Calculator Tools

Reliable, precise tools for mechanical, process, thermal, and fluid engineering

Fluid Mechanics

Flow, pressure loss, pumps, piping, measurement

  • Pressure Loss
    Darcy–Weisbach · Hazen–Williams · minors
    Open →
  • Gas Pipeline Sizing
    Optimal diameter
    Open →
  • Two-Phase Flow
    Lockhart–Martinelli · regimes
    Open →
  • Pump Sizing & NPSH
    Affinity laws · power
    Open →
  • Compressor Rating
    Polytropic · adiabatic head
    Open →
  • Blower & Fan
    Fan laws · system curve
    Open →
  • Reynolds Number
    Flow regime
    Open →
  • Cv / Kv Valve Sizing
    Pressure drop
    Open →
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Thermal Analysis

Heat exchangers, insulation, convection, jackets

  • Heat Exchanger
    NTU · LMTD · fouling
    Open →
  • LMTD & Correction Factor
    Open →
  • Insulation – Critical Thickness
    Heat loss
    Open →
  • Convection Coefficients
    Forced & natural
    Open →
  • Jacketed Vessel
    U-value · agitation
    Open →
  • Radiation Heat Transfer
    Stefan-Boltzmann
    Open →
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Machine Design

Shafts, gears, belts, springs, brakes, couplings

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Process Instrumentation

Valves, flow meters, safety devices

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Utility Tools

Conversions, steam tables, psychrometrics

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Fasteners & Joint Design

Bolts, rivets, welds, adhesive joints

  • Bolt Torque & Preload
    K-factor | proof load
    Open →
  • Nut-Bolt Tensile Strength
    Grades 8.8–12.9
    Open →
  • Thread Geometry
    Metric & unified
    Open →
  • Rivet Joint Design
    Shear | tearing | failures
    Open →
  • Weld Design
    Fillet & butt welds
    Open →
  • Adhesive Bonded Joint
    Shear | peel | safety factor
    Open →
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Solid Mechanics & Structural

Beams, columns, plates, torsion & buckling

  • Beam Bending & Deflection
    UDL | point loads
    Open →
  • SFD & BMD Diagrams
    Shear & bending moment
    Open →
  • Column Buckling
    Euler | Rankine
    Open →
  • Plate Stress Analysis
    Rectangular & circular
    Open →
  • Torsion of Shafts
    Solid & hollow sections
    Open →
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Materials & Stress Analysis

Stress-strain, fatigue, safety factors

  • Stress-Strain Properties
    Young's modulus | elongation
    Open →
  • Fatigue Life (S-N Curve)
    Basquin equation
    Open →
  • Impact Toughness
    Charpy | Izod
    Open →
  • Safety Factor Calculation
    Yield | buckling | fatigue
    Open →
  • Mohr's Circle
    Principal stresses
    Open →
  • Stress Concentration
    Kt values | notches
    Open →
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Automotive & Robotics

EV drivetrain, torque, gearing, battery

  • Motor Torque
    Wheel torque | RPM | traction
    Open →
  • Gear Train Optimization
    Ratio | efficiency
    Open →
  • Battery Runtime Estimator
    Capacity | discharge time
    Open →
  • Fuel Efficiency
    Mileage | range
    Open →
  • Power-to-Weight Ratio
    Acceleration estimate
    Open →
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Electrical & Mechatronics

Motor torque, VFD, servo load calculations

  • Motor Torque
    Load | RPM | shaft power
    Open →
  • VFD Output Frequency
    Speed control | poles | slip
    Open →
  • Servo Motor Load Analysis
    Inertia match | torque margin
    Open →
  • DC Motor Calculations
    Back EMF | armature current
    Open →
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Manufacturing Calculators

CNC, machining, welding, GD&T & surface finish

  • CNC Feed & Speed
    RPM | chip load | velocity
    Open →
  • Lathe Cutting Parameters
    Depth | speed | feed
    Open →
  • Milling Feed Rate
    Cutter diameter | teeth
    Open →
  • Welding Heat Input
    Voltage | current | speed
    Open →
  • GD&T / Fit Calculator
    ISO fits | tolerance zones
    Open →
  • Surface Finish Conversion
    Ra | Rz | µin
    Open →
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Material Properties

Physical, thermal & mechanical properties

  • Density Calculator
    Mass | volume | specific gravity
    Open →
  • Thermal Conductivity
    Material database
    Open →
  • Elasticity Modulus
    Young's | bulk | shear modulus
    Open →
  • Poisson's Ratio
    Lateral strain effects
    Open →
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Vessel Design

Pressure vessels, tanks, heads, nozzles

  • Cylindrical Shell Thickness
    ASME VIII Div 1
    Open →
  • Spherical Vessel Design
    Thin & thick wall
    Open →
  • Dished Head Calculations
    Torispherical | ellipsoidal
    Open →
  • Nozzle Reinforcement
    Area replacement method
    Open →
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Separation Systems

Distillation, absorption, extraction

  • Distillation Column Design
    McCabe-Thiele | reflux ratio
    Open →
  • Number of Theoretical Plates
    Fenske equation
    Open →
  • Absorption Tower
    Gas-liquid equilibrium
    Open →
  • Extraction Efficiency
    Liquid-liquid systems
    Open →
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Mixing Technology

Agitators, impellers, power requirements

  • Agitator Power Consumption
    Reynolds | power number
    Open →
  • Impeller Selection
    Turbine | propeller | anchor
    Open →
  • Mixing Time Estimation
    Blend time calculations
    Open →
  • Scale-up Calculations
    Geometric similarity
    Open →
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Phase Equilibria

VLE, LLE, phase diagrams, flash calculations

  • Vapor-Liquid Equilibrium
    Raoult's | Antoine equation
    Open →
  • Flash Calculation
    Two-phase separation
    Open →
  • Dew & Bubble Point
    Pressure & temperature
    Open →
  • Activity Coefficients
    NRTL | UNIQUAC | Wilson
    Open →
Show more…

Why Choose Our Tools

Engineered for precision, designed for efficiency

Fast Calculations

Get instant results with our optimized calculation engines.

Accurate Results

Industry-standard algorithms ensure precision in every calculation.

Responsive Design

Works perfectly on all devices - desktop, tablet, and mobile.

User-Friendly

Intuitive interface designed for engineers of all experience levels.

Advanced Visualization

Graphical representations of data and calculation results.

Regular Updates

We continuously improve our tools with the latest standards.

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