The Engineering ToolBox
Free tools and information for engineering and design of technical applications.
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 for 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.
• 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.