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

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

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Algebraic Expressions and Formulas

Principal algebraic expressions and formulas

Angle Calculator and Carpenter's Square

Calculate angles with a straight board across a carpenter's square

Angle Converter

Converting between units of angle.

Area of Intersecting Circles

Calculate area of intersecting circles

Area Survey App

Online app making an exact plot of a surveyed area - like a room, a property or any 2D shape.


ASCII codes and characters

Binary Adding, Subtraction, Multiplicaton and Division

Adding, subtracting, multiplying and dividing binary numbers

Binary to Decimal, Hexadecimal and ASCII Converter

Convert between binary, decimal and hexadecimal numbers

Binary, Octal and Hexadecimal Numbers

Decimal, binary, octal and hexadecimal numbers

Binomial Theorem

Binomial theorem for positive integers

Boolean Algebra

Summary of primitive logic functions

Center of Gravity

Bodies and their center of gravity

Centroids of Plane Areas

Square, rectangle, cirle. semi-circle and right-angled triangle

Chord Lengths when Dividing a Circle in to Equal Segments

Calculate chord lengths when dividing the circumference of a circle into equal number of segments

Circle - Equation

The equation for a circle

Circles and Squares - Equal Areas

Radius and side lengths of equal areas, circles and squares

Circles on the Outside of a Circle

The numbers of circles on the outside of an inner circle or the geometry of rollers on a shaft

Circles within a Rectangle

The maximum number of circles possible within a rectangle - ex. numbers of pipes or wires in a conduit

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Complex Numbers

Complex numbers are used in alternating current theory and in mechanical vector analysis

Content of Horizontal - or Sloped - Cylindrical Tank and Pipe

Volume of partly filled horizontal or sloped cylindrical tanks and pipes - an online calculator

Convert between Polar and Cartesian Coordinates

Cartesian and Polar coordinate converting

Data Types

Signed and unsigned datatypes

Decimal System Prefixes

Prefix names of units multiples and submultiples.

Differential Calculus

Derivatives and differentiation

Discrete Data Sets - Mean, Median and Mode Values

Calculate arithmetic mean, median and modal values from discrete data sets

Distance between Two 3D Points

Distance between two points in a three dimension coordinate system - online calculator

Elementary Curves

Ellipse, circle, hyperbola, parabola, parallel and intersecting and coincident lines

Elementary Surfaces

Ellipsoid, sphere, hyperboloid, cone and more

Exponents - Powers and Roots

The laws of fractional and integer exponents.


The product of all positive integers


Law of fractions

Fractions and Decimal Inches Equivalents

The inches fractional and decimal equivalents.

Geometric Shapes - Areas

Areas, diagonals and more - of geometric figures like rectangles, triangles, trapezoids ..

Hexagons and Squares - Diagonal Lengths

Distance between corners for hexagons and squares

Hyperbolic Functions

Exponential functions related to the hyperbola

Law of Cosines

One side of a triangle when opposite angle and two sides are known

Law of Sines

Angles in a generic triangle

Law of Tangents

Triangles and law of tangents

Laws of Indices

Simplifying calculations by involving indices

Length of Spiral

Calculate the length of a spiral or the length of material contained in a roll


The rules of logarithms - log10 and loge for numbers ranging 1 to 1000.

Minutes to Degrees Converting Chart

Convert from minutes to degrees

Numbers - Square, Cube, Square Root and Cubic Root Calculator

Calculate square, cube, square root and cubic root. Values tabulated for numbers ranging 1 to 100.

Numbers - Standard Form, Scientific and Engineering Notation

Writing numbers

Oblique Triangle

Oblique triangle equations

Optical Distance Law

Geometric dilution of light vs. distance.


Working with relative values.

Pipe Fractional Equivalents

Comparing pipe fractions and decimal inches

Prime Numbers

Numbers up to 1000

Pythagorean Theorem

The pythagorean theorem used for squaring

Radians vs. Degrees

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

Ratios and Proportions

The relative values between quantities - ratios and proportions.

Regular Polygons

Area of regular polygons

Right Angled Triangle

Right angled triangle equations

Scientific Calculator

Online scientific calculator

Smaller Circles within a Larger Circle

Estimate the number of small circles that fits into an outer larger circle - ex. how many pipes or wires fits in a larger pipe or conduit

Smaller Rectangles within a Larger Rectangle

The maximum number of smaller rectangles - or squares - within a larger rectangle (or square)

Solids - Volumes and Surfaces

The volume and surface of solids like rectangular prism, cylinders, pyramids, cones and spheres - online calculator.

Squares, Cubes and Roots

Numbers - squares, cubes, square roots and cube roots

Squaring with Diagonal Measurements

A rectangle is square if the length of both diagonals are equal

Standard Differentials and Integrals

Differentials and integrals

Taylor Series

Function as an infinite sum of terms


Triangle analytical geometry

Trigonometric Functions

Sine, Cosine and Tangent - Natural Trigonometric Functions.

Two Equations with Two Unknowns

Online calculator for two equations with two unknowns

Vector Addition

An online vector calculator - add vectors with different magnitude and direction - like forces, velocities and more.


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SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - 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!


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