Sometimes converting units may be confusing especially when the value contains other categories in the nominator and in
the denominator. It is not always clear if we have to multiply or divide by which value. We will show here a simple
way how to convert values from one unit to another by using proportion method to reduce confusion.

Units with nominators only 
Like units of: speed, length, time. 
Example: convert 3 ft to m 
1. Write the conversion factor values as
1 foot = 0.3048 meter.
2. Write the value of 3 feet in proportion method and the
required unit value x:
1(ft) = 0.3048 (m)
3 (ft) = x (m)
3. Calculate value of required unit x
x = 3 • 0.3048 = 0.9144 meter

Units with denominator only 
Like units of: wave number or diopter 
Example: convert 


Convert foot to meter and write the corresponding value in the denominator 1/1(ft) = 1/0.3048 (m)
Calculating x: 

And: 


Units with nominator and denominator 
Like units of: speed, acceleration, pressure, torque. 
Example: convert 


Write the conversion factor in the following way
Calculating x: 

And: 


Example: convert 


Write the conversion factor in the following way
Calculating x: 

And: 


Example: convert 


Write the conversion factor in the following way
Calculating x: 

And: 


It is clear that no matter how many categories a certain unit has the conversion process is the same as shown,
this way of calculating conversions eliminates the possibility of confusion.
