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

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Ratios and Proportions

Relative values between quantities - ratios and proportions

Ratio

The ratio of one quantity to an other is a fraction - and the number of times one quantity is contained in another quantity of the same kind.

The ratio between two quantities is the quotient obtained by dividing the first quantity by the second.

Example - Ratio

The ratio between 3 and 6 can be expressed as

3 / 6 = 1 / 2 = 0.5

Ratio can also be indicated by the sign ":" - like 3 : 6 or 1 : 2.

Reciprocal or Inverse Ratio

The reciprocal or inverse ratio is the opposite of the original ratio.

Example the Inverse Ratio

The inverse ratio between 6 and 3 can be expressed as

6 : 3  = 2 : 1 = 2

Proportion

Proportion is the equality of ratios.

1 : 2 = 3 : 6

Related Topics

• Basics - The SI-system, unit converters, physical constants, drawing scales and more
• Mathematics - Mathematical rules and laws - numbers, areas, volumes, exponents, trigonometric functions and more

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SketchUp Extension - Online 3D modeling!

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Unit Converters

Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

10 11

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