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
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.
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.
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.