Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

The Engineering ToolBox

Free tools and information for engineering and design of technical applications.

The Engineering ToolBox provides a wide range of free tools, calculators, and information resources aimed at engineers and designers. It offers detailed technical data and calculations for various fields such as fluid mechanics, material properties, HVAC systems, electrical engineering, and more.

The site includes resources for common engineering tasks, such as calculating physical properties (e.g., density, viscosity, thermal conductivity), converting units, and designing systems like heating and water distribution.

With sections on everything from acoustics to hydraulics, it serves as a comprehensive tool for both students and professionals in technical and engineering disciplines.

Popular Documents

Water Density, Specific Weight and Thermal Expansion Coefficients - Temperature and Pressure Dependence

Data on the density and specific weight of water across various temperatures and pressures. Useful for engineering, fluid dynamics, and HVAC calculations.

Steel Pipes Expansion Loops - Design and Calculation

Steel pipe expansion loops and their importance in managing thermal expansion, and how to design and size them effectively. Key considerations, calculations, and installation tips to prevent stress and damage in piping systems.

Air Properties - Density, Viscosity, Heat Capacity, Thermal Conductivity, and more

Thermal properties of air, including density, viscosity, thermal conductivity, specific heat and more at different temperatures and pressures. Comprehensive reference with formulas, tables, and charts to support engineering calculations.

American Wide Flange Steel Beams (W-Beams) - Dimensions and Properties in Imperial Units

Dimensions, weight, section properties, and essential data of American wide flange steel beams (W-beams) according to the ASTM A6 standard.

Linear Thermal Expansion Coefficients of Materials

Linear thermal expansion coefficients of common materials, including metals, plastics, and composites.

Hot Air Balloon Lifting Force Calculator

Calculate the lifting force of a hot air balloon based on temperature difference, air density, and balloon volume. Includes formulas, explanations, and practical applications for aeronautics and physics.

Poisson's Ratio – Definition, Values for Materials, and Applications

Poisson's ratio, a key material property describing the relationship between axial and lateral strain in solid materials. Typical Poisson's ratio values for metals, polymers, ceramics, and more, along with practical applications in engineering and mechanics.

Air - Psychrometric Chart for Standard Atmospheric Conditions - Imperial Units

Psychrometric chart to analyze air properties, including temperature, humidity, enthalpy, and dew point at barometric pressure 29.921 inches of Mercury and temperature ranging 20oF to 120oF.

Water Thermal Properties – Density, Heat Capacity, and Conductivity

Thermal properties of water, including density, specific heat capacity, thermal conductivity, and thermal expansion at different temperatures.

Radians vs. Degrees - Definition and Conversions

Radian is the SI unit of angle. Convert between degrees and radians. Calculate angular velocity.

Miter Saw Angle Protractor – Quick & Accurate Angle Measurements

Use a miter saw angle protractor for precise angle calculations in woodworking and construction. Measure and cut perfect angles effortlessly.

Friction Coefficients - Common Materials and Surfaces

Find friction coefficients for various material combinations, including static and kinetic friction values. Useful for engineering, physics, and mechanical design applications.

Young’s Modulus of Elasticity – Values for Common Materials

Young’s Modulus (Elastic Modulus) of various materials, including metals, plastics, and composites. How stiffness and elasticity influence material performance in engineering applications.

Thermal Conductivity of Common Materials - Solids, Liquids and Gases

Thermal conductivity of various common materials, including metals, gases, and building materials. Essential data for engineers, architects, and designers working with heat transfer and insulation.

Square and Cube Roots of Numbers – Reference Table

Comprehensive table of square and cube roots for various numbers.

Dynamic, Absolute, and Kinematic Viscosity – Definitions & Conversions

The differences between dynamic, absolute, and kinematic viscosity - a fluids resistance to flow - with definitions, unit conversions, and practical applications for engineers and scientists.

AWG Wire Gauge Chart & Table – American Wire Gauge (AWG) Standards

The AWG (American Wire Gauge) wire size chart with detailed specifications on wire diameter, resistance, and ampacity. Find conversions between AWG sizes and metric units for electrical and engineering applications.

Density, Specific Weight, and Specific Gravity – Definitions & Calculator

The difference between density, specific weight, and specific gravity. Including formulas, definitions, and reference values for common substances.

Hot Water Heating System Online Design Application

Free online design tool for designing hot water heating systems - metric units.

Water - Dynamic and Kinematic Viscosity at Various Temperatures and Pressures

Free online calculator - figures and tables with viscosity of water at temperatures ranging 0 to 360°C (32 to 675°F) - Imperial and SI Units.

ASME/ANSI B16.5 Flanges and Bolt Dimensions - Class 150 to 2500

Diameters and bolt circles for standard ASME B16.5 flanges - 1/4 to 24 inches - Class 150 to 2500.

Inches to Millimeters Conversion Calculator

Convert fractional and/or decimal inches to metric mm - and vice versa.

Wrench Size Conversion Chart – Metric (mm) to SAE (Inches)

Convert between metric and SAE (inch) wrench sizes with this comprehensive comparison chart. Find the closest equivalent sizes for your tools, whether working with US standard (SAE) or metric fasteners.

Area Moment of Inertia with Definitions, Formulas & Calculator

Explore the area moment of inertia (second moment of area) with detailed formulas, calculation tools, and reference tables for common shapes. Essential for structural and mechanical engineering applications.

Dry Air Thermodynamic and Physical Properties – Density, Specific Heat, Viscosity

THe essential thermodynamic properties of dry air like specific heat, ratio of specific heats, dynamic viscosity, thermal conductivity, Prandtl number, density and kinematic viscosity at temperatures ranging 175 - 1900 K.

New vs. Old Car Costs: A Comprehensive Cost Comparison

Compare the total cost of owning a new car versus an old car, including purchase price, maintenance, fuel efficiency, insurance, and depreciation. Use our detailed breakdown to make an informed financial decision before buying the next vehicle.

Topics

  • Acoustics

    Room acoustics and acoustic properties. decibel A, B and C calculations. Noise Rating (NR) curves. Sound transmission through walls. Calculate sound pressure, sound intensity and sound attenuation.
  • Air Psychrometrics

    Moist and humid air calculations. Psychrometric charts and Mollier diagrams. Air-condition systems temperatures, absolute and relative humidities and moisture content in air.
  • Basics

    Basic engineering data. SI-system, unit converters, physical constants, drawing scales and more.
  • Combustion

    Combustion processes and their efficiency. Boiler house and chimney topics. Properties of fuels like oil, gas, coal and wood and more. Safety valves and tanks.
  • Drawing Tools

    2D and 3D engineering drawing tools.
  • Dynamics

    Motion of bodies and the action of forces in producing or changing their motion - velocity and acceleration, forces and torque.
  • Economics

    Engineering economics - cash flow diagrams, present value, discount rates, internal rates of return - IRR, income taxes, inflation.
  • Electrical

    Electrical engineering with units, amps and electrical wiring. Wire gauges, electrical formulas, motors and more.
  • Environment

    Climate, meteorology, solar, wind, emissions and environmental related engineering resources.
  • Fluid Mechanics

    The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
  • Gases and Compressed Air

    Properties of air, LNG, LPG and other common gases. Pipeline capacities and sizing of relief valves.
  • HVAC Systems

    Design and sizing of Heating, Ventilation and Air Conditioning systems.
  • Hydraulics and Pneumatics

    Hydraulic and pneumatic systems - fluids, forces, pumps and pistons.
  • Insulation

    Calculate heat transfer and heat loss from buildings and technical applications. Heat transfer coefficients and insulation methods available for reduction of energy consumption.
  • Material Properties

    Properties of gases, fluids and solids. Densities, specific heats, viscosities and more.
  • Mathematics

    Mathematical rules and laws - numbers, areas, volumes, exponents, trigonometric functions and more.
  • Mechanics

    The relationships between forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more.
  • Miscellaneous

    Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more.
  • Physiology

    Human physiology vs. air quality, comfort temperatures, activity and metabolic rates. Health effects of gases adn polutions like carbon monoxide and more.
  • Piping Systems

    Calculate dimensions of pipes and tubes. Pressure drop calculations and head loss charts. Use of different piping materials. Insulation of pipes and tubes and heat loss diagrams.
  • Process Control Systems

    Instrumentation, design and documentation of process control systems.
  • Pumps

    Design of pumping systems and pipelines. With centrifugal pumps, displacement pumps, cavitation, fluid viscosity, head and pressure, power consumption and more.
  • Sanitary Drainage Systems

    The purpose of the sanitary drainage system is to remove effluent discharged from plumbing fixtures and other equipment.
  • Standard Organizations

    National and International organizations producing codes and standards - ANSI, ISO, DIN, BSi and more.
  • Statics

    Forces acting on bodies at rest under equilibrium conditions - loads, forces and torque, beams and columns.
  • Steam and Condensate

    Design of steam & condensate systems with properties, capacities, sizing of pipe lines, system configuration and more.
  • Thermodynamics

    Work, heat and energy systems.
  • Water Systems

    Design of hot and cold water service and utility systems with properties, capacities, sizing of pipe lines and more.
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