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

Precious Metals - Unit of Fineness

Unit of fineness - Carat

Abbreviations according International Electrotechnical Commission

Conforming abbreviations according IEC

Air Temperature and Altitude

Altitude - air temperature and air density

Altitude above Sea Level and Air Pressure

Elevation above sea level - in feet and meter - with barometric and atmospheric pressure - inches mercury, psia, kg/cm2 and kPa

Antifreeze - Required Amount

Cooling system capacity, temperature and required antifreeze

Apothecaries' Weight System

Apothecaries' fluid and weight system - ounce, drachms, grains, scruples ..

Area Survey App

Online calculator app to make an exact plot of a surveyed area - like a room, a property or any 2D shape

Assembly of Shrink-Fits

Heating temperatures of shrink-fits

Barometer - Elevation Compensation

Compensating barometers for their elevation

Barometric Pressure - Pressure in Pounds per Square Inch and Square Foot

Relation between barometric pressure (inches Hg) and pressure in psi and psf

Beaufort Wind Scale

The Beaufort description and observation of wind and wind velocity

Blueprint Letters

Letters used to differentiate blueprint drawings

Board Feet Chart

Board Foot - the volume measurement of lumber

Bolts - Lubrication Effects on Torque and Tension

Lubrication effects on torque and bolt tension

Bricks - Estimating Quantity and Mortar Consumption

Required quantity of bricks and mortar

Builder's to Surveyor's Measurements

Convert builder's measurements to surveyor's measurements

Building Foundations - Load

Loads on building foundations

Building Tolerances

Tolerances for floors, walls, columns and more

CE Marking

The European Machine Directive

CSI MasterFormat Specifications

Construction Specifications Institute's 2004 Master-Format Edition

Chemicals - Chemical Formulas

Chemical formulas and trade names

Clothes - Comparing US, UK and European Sizing

Comparing European, UK, US sizing in clothing, shoes, shirts and sweaters

Color Mixing Theory

Subtractive and additive color mixing theories

Concrete - Calculate Cubic Volume

Calculating required concrete volume

Concrete - Volume Estimate

Estimate required concrete volume per sq. ft. of slab

Concrete - Water to Cement Ratios

Concrete and water to cement ratios

Concrete Columns

Estimate concrete volume required for concrete columns

Concrete Slabs - Load Capacities

Load capacity of simply supported concrete slabs

Concrete Slabs and Thickness

Recommended thickness of concrete slabs

Concrete Volume for Footing

Estimate concrete volume required for footing

Concrete Walls

Estimate volume of concrete walls

Constants of e

e constants

Constants of π (pi)

π constants

Conveyors - Capacities

Calculate conveyor capacity

Conveyors - Load & Power Consumption

Load and conveyors required power consumption

Conveyors - Maximum Slopes

Maximum conveyor slopes for various materials

Cooking Volume Converter

Convert between liquid volumes used for cooking

Cooking Volume Converter - US and Metric Units

Convert common cooking liquid and dry measuring volumes between US and metric units

DFA - Design for Assembly index

Design for Assembly Index


Decibel is a logarithmic unit used to describe the ratio of a signal level - like power, sound pressure, voltage, intensity etc.

Drawings - Sheet Layouts

Standard layouts of drawing sheets

Drawings - Standard Metric Sizes

Standard metric sizes of drawing sheets

Drill Bit Speed - Hardwood and Softwood

Hardwood and softwood drill speed chart

Driving Distances between European Cities

Driving distances between some major European cities

Dumping or Tipping Angles

Tipping angles for some common materials like ashes, sand, earth, shingles ...

Dust Explosions - Critical Temperatures and Concentrations

Critical temperatures and concentration parameters for substances like coal, zinc, uranium and more

Effects of Low-Frequency Vibrations on Buildings

Effects of low-frequency vibrations on building constructions

Electrical Equipment and Power Consumption

Typical power consumption and running time for some common electrical equipment

Electrode Potential and Galvanic Corrosion

Introduction to electro chemical series and corrosion of metals

Elevation - Speed of Sound

Speed of sound, temperature and pressure at different altitudes

Engine & Gear Oil - Temperatures and Viscosity Limits

Oil viscosity vs. temperature

Excavation Slope

Calculating excavation slope

Factors of Safety

Factors of Safety - FOS - are important for engineering design

Fasteners - Types Chart

Wood screws, machine screws, sheet metal screws, self drilling SMS and more

Feet and Inches - to Inches Converter

Convert from feet and inches to inches

Firestop Ratings

F-rating, T-rating and L-rating of firestopping systems

Food Products - Osmotic Pressure

Osmotic pressure of some food products

Friction and Friction Coefficients

Friction theory and coefficients of friction for ice, aluminum, steel, graphite and other common materials and materials combinations

Frozen Food - Storage Life

Practical storage life for some common frozen food products

Fruits and Vegetables - Optimal Storage Conditions

Optimal temperature and humidity conditions for some common fruits and vegetables

Fuel Consumption Converter

Convert between common fuel consumption units - US MPG, Imperial MPG, l/nm, l/100 km and km/litre

Gauge and Weight Chart

Gauge and weight chart for sheet steel, galvanized steel, stainless steel, aluminum and strip & tubing

Glue-Laminated Timber - Dimensions

Typical sizes of glue-laminated timber

Golden Section

Or Golden Mean

Gravel - Cover Area

Aggregate cover area

Grease - Temperature Limit

Grease is a combination of oil and a thickener

HTML Color Codes

Safe html color codes

Hardwood Lumber - Dimensions

Size of hardwood lumber

Hazardous Areas Classification - European Standard

European hazardous area classification in zones, protection types, temperature codes and codes

Hazardous Areas Classification - North America

North American hazardous locations classification in classes, divisions and groups

Inches - Decimal Equivalents

Decimal equivalents of eights, sixteenths, thirty-seconds and sixty-fourths of an inch

International Standard Atmosphere

International standard atmosphere in elevation -2000 to 30000 meters - pressure, temperature, density, viscosity, thermal conductivity and velocity of sound

Latitude and Acceleration of Gravity

Acceleration of gravity varies with latitude

Latitude and Longitude Converter

Convert between Degrees, Minutes and Seconds and Decimal Units (or vice versa)

Lead Acid Batteries

Specific gravity and charge of lead acid batteries - temperature and efficiency

Length Units Converter

Convert between units like meters, feet, inches, yards, kilometers and miles

Liter per km - liter/km

Distance traveled and fuel consumption - liter per km (liter/km)

Machine Processing and Tolerance Grades

Machine processing and tolerance

Manila Rope - Strength

Manila 3-strand rope - minimum breaking strength and safe load

Mapping Scales - Length and Area

Convert between mapping scales and length and area

Masonry Blocks - Dimensions

Concrete Masonry Unit Blocks (CMU) - dimensions

Materials - Light Reflecting Factors

Light reflecting factor materials

Mechanical Processing and Surface Roughness

Mechanical production methods and their surface roughness

Metric Bolts - Head and Wrench Sizes

ANSI/SO, DIN and JIS bolts

Mild Steel - Round Bar

Round bar weights

Mild Steel - Square Bars

Typical weight of mild steel square bars

Miles per Gallon - mpg

Miles per gallon - mpg - fuel chart

Minutes to Decimal Hours

Converting minutes to descimal hours

Mortar Types

ASTM Mortar Types

Nails and Spikes

Allowable withdrawal load

Numerical Constants

Some numerical constants

Nylon Rope - Strength

Nylon 3-strand and 8-strand rope - minimum breaking strength and safe load

Oil - Lubrication and Temperature Limit

Temperature limits for lubricating oils

Online Mortgage Payment Calculator

Calculate mortgage payment with Annual Interest Rate, Number of Years and Amount Borrowed

Paper Drafting Sizes - Comparing ISO Drawing Sheets with U.S. Drawing Sheets

ISO drawing sheets compared with U.S. and Canadian drawing sheets

Paper Drafting Sizes - ISO 216 series A, B and C

The ISO 216 A, B and C drawing series - dimensions of regular, oversized and envelope sheets

Paper Sizes - Imperial

Sizes used for printing and drawing papers

Paper Sizes - commonly used in U.S. Offices

Office paper sizes as Letter, Legal, Tabloid and more

Pasteurization Temperatures

Pasteurization methods and temperatures

Poisson's ratio

When a material is stretched in one direction it tends to get thinner in the other two directions

Polyester Polyolefin Rope - Strength

Polyester Polyolefin dual fiber 3-strand rope - minimum breaking strength and safe load

Polyester Rope - Strength

Polyester 3-strand and 8-strand rope - minimum breaking strength and safe load

Polypropylene Fiber Rope - Strength

Polypropylene fiber 3-strand and 8 strand rope - minimum breaking strength and safe load

Rebar - Metric Reinforcing Bar

Reinforcing bar - European metric dimensions

Rebar - U.S. Imperial Reinforcing Bar

U.S. imperial dimensions of rebar

Rebar - Weights

Weights of rebar rods - size ranging 1/4

Rectangular Tanks - Volume

Tank volume per foot depth

Roman Numerals

Roman numerals are a combinations of seven letters

Roof Framing

Run, Roof Slope, Gable Height and Gable Area

Roofing Materials - Weights

Weight calculator for roofing materials

Safety Signals - recommended Colors

American National Standards Institutes schedule for safety colors marking physical hazards

Sandpaper - Grit Sizes

Grit sizes ranging 12 - 600

Scale of Objects

The relative scale of objects

Scientific and Engineering Terms - ANSI Abbreviations

Abbreviations for Use on Drawings and in Text - ANSI Y1.1

Shackles - Safe Loads

Safe loads of shackles

Shipping Units of Measure

Vessel and cargo capacities

Sieve Size and Mesh Designation

US commercial sieve sizes and mesh designations

Sisal Rope - Strength

Sisal rope 3-strand, minimum breaking strength and safe load

Slope - Degree, Gradient and Grade Converter

Converting slopes between degrees, gradients and grades

Softwood Lumber - Dimensions

Commercial softwood lumber dimension chart - nominal and actual sizes

Softwood Lumber - Grading

Rough lumber, surfaced lumber (dressed), worked lumber, shop and factory lumber and yard lumber

Soil and Rock - Bulking Factors

Soil and rock expansion - or swell - after mining

Speed and Velocity Converter

Convert speed and velocity units - m/s, km/h, knots, mph and ft/s

Speed vs. Time - Graph Calculator

Velocity plotted against time diagram

Sprinkler Protection Area

Maximum fire sprinkler protection area

Stair Calculator

Calculate unit rise and run in stairs

Standard Gauges

Standard gauges for wire and sheet - American, Birmingham, Washburn, Music, Stubs ..

Standard US Architectural Drawing Sizes

Commonly used US architectural drawing sizes and formats

Standard US Engineering Drawing Sizes

US engineering drawing sizes based on ANSI/ASME Y14.1

Steel Flats - Weight

Typically weight of mild steel flats

Steel Plates - Size & Weight

Size & weight of steel plates - thickness ranging 3/16 - 10 inches - metric units

Steel Wool Grades

Steel wool grades and fiber thickness

Stockpile Volumes

Volume of natural stockpiles - cubic feet, yard, meter and decimeter

Stone - Weight and Strength

Weight and strength of sandstone, granite, limestone, marble and slate

Stress in Bolts

Calculating stressed area in UN and UNR bolts

Studs Quantity

Calculate number of studs

Surface Finishing

Lumber and surface finishing abbreviations

Surface Roughness and Abrasive Grain Size

U.S. mesh size and surface roughness

Tank Volume

Volume of cylindrical (round) tanks - US. gallons per foot of dept or length

Tempering Colors of Steel

The tempering process of hardening steel

The Greek Alphabet

The Greek alphabet is essential when expressing formulas and technical language

Threads - Metric ISO 724

M Thread (metric ISO 724 thread) European Standard

Trees - Urban Heights

Height of trees commonly used in towns and urban areas

Trees - Water Demand

Trees and their relative water demand

Trench Excavation

Estimate trench excavation - online calculator

Troy Weight

Weighing gold and silver

Types of Contracts

Commonly used engineering and construction contracts

US Bolts - Head and Wrench Sizes

Hex Bolt, Lag Bolt, Square Bolt and Heavy Hex Bolt

US Machine Screws

Machine screw diameters

US and Metric Fasteners - Thread Sizes

Printable fastener tools

UTM to Latitude and Longitude Converter

Online UTM to Latitude Longitude converter


The ASTM E1557 UNIFORMAT II Standard

Value Engineering

Enhancing function and improving value

Vehicle Miles Traveled

Speed (miles per hour), time (hours) and distance traveled (miles)

Vehicle km Traveled

Speed (km per hour), time (hours) and distance traveled (km)

Vehicles Traffic - Flow and Density

Vehicles flow and densities in highway design

Wire Rope - Strength

6 strand x 19 wire (6x19) - minimum breaking strength, safe loads and weight

Wood - Moisture and Compressive Strength

Red Spruce, Longleaf Pine and Douglas Fir - moisture content and their compressive strength

Wood Screws

Allowable withdrawal load or force

Wood Screws

Shank diameters - pilot holes

Wood Screws - Holes

Hard wood and soft wood pilot holes, shank clearance holes and countersink diameters

Wrench Conversion Chart

Comparing US and metric wrenches

pH Definition

Introduction to pH

Search the Engineering ToolBox

- "Search is the most efficient way to navigate the Engineering ToolBox!"

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your SketchUp model with the Engineering ToolBox - SketchUp Extension/Plugin - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Translate the Engineering ToolBox!
About the Engineering ToolBox!