Convert millimeter to fractional inches
and inches to mm

the system recognize the units .. just type a value ;)
mm values just numbers, inches values include slash or "
your online conversion table ;)


How use this conversion calculator?

mm > inch   millimeter to fractional inches

just enter the metric (mm) value and choose the divisor i.e.:

  9.5   mm   in divisor 16
      0 5/16"   7.9375 mm
      0 3/8"   9.5250 mm

inch > mm   decimal inch to fraction of inch and millimeter

enter the value using double quotes ("), i.e.:

  1.25" dec. inch   divisor 16
      1 1/4"   31.7500 mm

To improve the approximation in fractional inches, set 512 in the divisor.

inch > mm   fraction of inches to millimeter

enter value with slash (/), i.e.:

  1/8 frac. inches   divisor 64
      1/8"   3.1750 mm

enter value with space and slash (/), i.e.:

  1 1/4 frac. inches   divisor 16
      1 3/4"   44.4500 mm

or enter the value using double quotes ("), space and slash (/), i.e.:

  1" 3/8 frac. inches   divisor 16
     1 3/8"   34.9250 mm

mistakes, typos or crazy values are rounded to the best approximation, i.e.:

  2 3/83 frac. inches   divisor 128
     2 1/32"   51.5938 mm
     2 5/128"   51.7922 mm

caculator to convert mm in fraction of inches and inches to mm - decimal inches to mllimeters (mm)

convert millimeters (mm) to fractional inches - decimal inches to millimeters mm calculator

The Metric System

The Metric System was officially created in France in 1790. By the advantages it has been adopted by many countries, currently only a few do not, which facilitates scientific work and trade relations. Brazil adopted the Metric System on June 26, 1862, Law 1.157, however in many everyday situations the Imperial System (or English System as is know) continues to be used, which causes some confusion.
The Metric System use 10 as divisor and the Imperial System use the number 12, since it is divisible by 2, 3, 4 and 6. In our daily lives is common the use of such fractions ( 1/4 kilo, 3/4 gallon ...) as well as the use of some units such as the gallon in chemicals (1/4 = 900 mL)*, gold in ounces, construction steel gauges, tire sizes ( 14" ), many screws are still marketed in inch and even the screens of televisions and phones released in inches. In some segments the shuffling is higher, the electric motors presented in Hp, Cv, Watt

Like other systems, the "Imperial" had some slight variations between the adopted standards, for example: an inch in England was not exactly the same as a Canadian inch and the Imperial gallon differed from the American gallon, these and other differences generated numerous technical-commercial problems. It was not until the late 1950s that the Imperial System was uniformed worldwide, and among other resolutions the equivalence between millimeter and inch was established:

25,4 mm = 1" ( inch )

* We do not found the origin from 1 gallon equal 3.6 Liters, used in Brazil, but in some places we found 1 gallon equal 3.2 Liters.