If you need to **convert a unit between fractional, milesimal inch and millimeter ** go to the page: **Calculate linear dimensions in millimeter, fractional and milesimal inch ** and solve your problem, later come back here to learn how to do it.

This **Interactive conversor of millimeter to inch Interativo de millimeter para polegada (and vice-versa) ** was created to facilitate your comprehension, to allow you to evaluate your results and antecipate them. It's utilization is very simple, roll down the page until the conversor, drag and drop the red line in the horizontally, by aligning the values on the scales (millimeter **'mm' ** and inch **'in'**). Just below them, the values appear in millimeters, fractional inch (fractioned) and corresponding milesimal inch and the formula of calculation. After interacting, rol down the page to understand the mechanics of the calculation.

Before going on on this page, I recommend you to interact with the

Fractiontopic on page:Using the fractional inch understanding and measuring, later come back here, it's worthing!

Inch ( *polegada */ *polegadas * in portuguese). Your abreviation is **in **, sometimes we see **" ** (double quotes) or **pol **. It is a linear measure unit of English System, Imperial System, among others. Was based on the dimensions of the human body and the fractional number system (fractionated).

Some people maintain that its controversial origin is associated with the extent of the human thumb, another argues that its origin comes from the Latin word *uncia * that means "one twelfth" so, inch is an *uncia *, or 1/12, the foot.

Later, beyond the fractional system, it became to be divided by the decimal system, this way we have two division systems of inches that we have to know about: the fraction (eg.: 1/128") and milesimal (eg.: 0.025in). The milesimal system is also known as milesimal of inch (mil) the notation of the previous example is 25mil (twenty-five thousandths of an inch).

Nowadays, and by definition, the *yard * was standardized as 0.9144m. A yard is aproximatelly to 3 foot -table 1, a inch, that is 1/12 of a foot, and it's aproximatelly to 2.54cm or 25.4mm (unit used in the metrology, mechanical engeneering and in the metal mechanic ofices). **0.9144/(3*12) **

Thus, 1in = 25.4 mm. So we have 25.4 mm/in (25.4 millimeters by "for each" inch)-Figure 1 (note that in Interactive conversor (simulador) there are two parallel horizontal lines of the same length. They are equivalent to 1.000in and 25.4mm - 1 ") (bounded by **0 ** and ** 1**).

figure 1

Transformation of inch to millimeter? Nothing more easy!

The fractional inch is the one represented as a fraction, for example: 1/2" (half inch); 1/4" (a quarter of inch); 7/16"(seven sixteenths inch); 3.5/128" (three inches five hundred twenty eight cents).

To convert to milesimal inch form simply divide the fraction and add the integer part. See:

- 1/2" -> one divided by two -> 0.5"
- observe that in the english system the point used as separator of the integer part (zero) of the decimal part (five) of number

- 1/4" -> one divided by four -> 0.25"
- 7/16" -> seven divided by sixteen -> 0.4375"
- 3.5/128" five divided by one hundred and twenty eight and added three -> 3.0391"

Just multiply the measure in milesimal inch by 25.4mm/in. See:

- 0.5in * 25.4mm/in = 12.7mm
- 0.25in * 25.4mm/in = 6.35mm
- 0.4375in * 25.4mm/in = 11.112mm
- 3.0391in * 25.4mm/in = 77.192mm

Just transform the fractional inch in milesimal inch and multiplicate the meausre in milesimal inch by 25.4mm/in. See this example: 1.3/8" (or 1.3/8in or also a three-eighths inch). We will divide three by eight, to transform the fraction in mils of inch, will add the integer part and multiply by 25.4 mm/in.

- 3/8 = 0.375in
- three hundred seventy-five mil
- observe that in the english system the point is used as separator of the integer decimal part of the number

- 0.375in + 1in = 1.375in
- 1.375in x 25.4mm/in =34.92mm

other example: we will transform 5.1/8in (five and one-eighth inch) in millimeter: we will divide one by eight (1/8 = 0.125), and add five and multiplicate by 25.4mm/in-figure 2.

figure 2

It's a little bit more difficult, but it's also easy, just divide the measure in millimeter by 25.4 mm/in. See this example: 70 mm. We will divide 70mm by 25.4mm/in obtainning 2.756in (or two thousand seven hundred fifty-six mils) already is the milesimal inch.

To convert to fractional inch, subtract the integer part and keep it: 2.756in - 2in=0.756in. Multiply this value by 128/128 (that is the lower fraction of inch used in the mechanical engineering, besides being equivalent to **one ** -that os the neutral element of multiplication) and obtain as result 96.77/128. Round the numerator 97/128in and add the whole number that was reserved: 2.97/128in. With no intention to make anymore decorate, the fact that the numerator is an odd number indicates that it is necessary to simplify the fraction. If the numerator is even simplify the fraction - Figure 3.

- 70mm / 25,4mm/in = 2.756in (milesimal form of inch)
- 2.756in - 2in = 0.756in
- 0.756in x 128/128 = 97/128in
- 2in + 97/128in = 2.97/128in

or

- 88.9mm / 25.4mm/in = 3.500in
- 3.500in - 3in = 0.500in
- 0.500in x 128/128 = 64/128 (64 is an even number)
- 64/128 = 32/64 = 16/32 = 8/16 = 4/8 = 2/4 = 1/2
- 3in + 1/2in = 3.1/2in

figure 3

See! There is nothing more than this.

**Now, solve the lists of exercises and check the results: **

- exercises of conversion of millimeters to fractional and milesimal inch
- exercises of conversion of fractional inch to millimeters and milesimal inch
- exercises of conversion of milesimal inch to millimeters and fractional inch

practise a little bit with the Interactive Conversor and check the results at:

Program to calculate linear dimensions in millimeter, fractional inch and milesimal

Any problems? take a look in the page:

Use of measures in fractional inch - understanding and applying .

table 1

**Meter **, from greek metron = measure. Your abreviation is **m ** (minuscule). That is a unit of linear measure of International System. Was based on the size of the earth and the decimal number system. His thousandth part is **millimeter ** abreviation **mm ** (minuscules), widely used in mechanical engineering.

conversion of linear measures between millimeter, fractional inch and milesimal

The utilization is very simple, **drag ** and **drop ** the vertical line in the horizontal, aligning the values in the scales (millimeter **'mm' ** and inch **'in'**). Just below them, t will appear the corresponding values in millimeters, fractional inch and milesimal inch and the formula to the calculation.

This ** Interactive Conversor of millimeter to inch (and vice-versa) ** was designed to facilitate comprehension, allow you to evaluate your results and anticipate.

Use of meausres in fractional inch - understanding and applying

Use of paquimeter in fractional inch - measuring and interpreting

Table of conversion between fractional inch, milesimal inch, foot and millimeterCalculate linear dimensions in millimeter, fractional inch and milesimal inch

Conversion program between linear units: transformation between Millimeter, fractional Inch and Milesimal