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.
Water Density, Specific Weight, and Thermal Expansion Coefficients at Varying Temperatures
Definitions, online calculator and figures and tables with water properties like density, specific weight and thermal expansion coefficient of liquid water at temperatures ranging 0 to 360°C (32 to 680°F).
Steel Pipes - Thermal Expansion Loops
Calculating and sizing steel pipe thermal expansion loops.
Thermodynamic Properties of Air: Density, Heat Capacity & More
Thermal properties of air at different temperatures - density, viscosity, critical temperature and pressure, triple point, enthalpi and entropi, thermal conductivity and diffusivity and more.
American Wide Flange Steel Beams (W-Beams): Dimensions and Properties in Imperial Units
Dimensions of American Wide Flange Beams ASTM A6 (or W-Beams) - Imperial units.
Linear Thermal Expansion Coefficients for Common Materials
Linear temperature expansion coefficients for common materials like aluminum, copper, glass, iron and many more.
Hot Air Balloon Lifting Force: Principles, Equations and Calculator
Calculate the lifting force of a hot air balloon using temperature, air density, and buoyancy principles - includes key formulas and an online calculator for quick estimations.
Poisson's Ratio
When a material is stretched in one direction it tends to get thinner in the other two directions.
Air - Psychrometric Chart for Standard Atmospheric Conditions - Imperial Units
Psychrometric chart for air at barometric pressure 29.921 inches of Mercury and temperature ranging 20oF to 120oF.
Thermal Properties of Water
Thermal properties of water at different temperatures like density, freezing temperature, boiling temperature, latent heat of melting, latent heat of evaporation, critical temperature and more.
Radians vs. Degrees
Radian is the SI unit of angle. Convert between degrees and radians. Calculate angular velocity.
Miter Saw - Calculate Sawing Angle
Calculate miter saw protractor angles for skirting and decorative mouldings work.
Friction Coefficients for Common Materials: Static and Kinetic Friction Data Calculator
Friction theory with calculator and friction coefficients for combinations of materials like ice, aluminum, steel, graphite and many more.
Understanding Young’s Modulus: Definition, Values & Engineering Applications
Young's Modulus (or Tensile Modulus alt. Modulus of Elasticity) and Ultimate Tensile Strength and Yield Strength for materials like steel, glass, wood and many more.
Thermal Conductivity of Solids, Liquids and Gases
Thermal conductivity coefficients for insulation materials, aluminum, asphalt, brass, copper, steel, gases and more.
Square, Cube, Square Root and Cubic Root Calculator
Calculate square, cube, square root and cubic root of numbers. Values tabulated for numbers ranging 1 to 100.
Viscosity - Absolute (Dynamic) vs. Kinematic
Vicosity is a fluid's resistance to flow and can be valued as dynamic (absolute) or kinematic.
AWG - American Wire Gauge Converting Chart
American Wire Gauge (AWG) vs. cross sectional area converter.
Density, Specific Weight, and Specific Gravity – Definitions & Calculator
An introduction to density, specific weight and specific gravity.
Hot Water Heating Systems - Online Design Application
Free online design tool for designing hot water heating systems - metric units.
Water Viscosity: 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.
Inch to mm Conversion Table & Calculator
Convert fractional and/or decimal inches to metric mm - and vice versa.
Wrench Spanners - Inches vs. mm
Convert between US Inches and metric mm wrench and spanner sizes.
Area Moment of Inertia: Definitions, Formulas & Calculator
Typical cross sections and their Area Moment of Inertia.
Dry Air - Thermodynamic and Physical Properties
Thermodynamic properties of dry air - specific heat, ratio of specific heats, dynamic viscosity, thermal conductivity, Prandtl number, density and kinematic viscosity at temperatures ranging 175 - 1900 K.
Cars - New vs. Old Car Cost Calculator
Calculate and compare the costs between owning a new vs. an old car.
• 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.