How many mm makes one inch?

How many millimeters in an inch? 1 inch is equal to 25.4 millimeters, which is the conversion factor from inches to millimeters.

Go ahead and convert your own value of in to mm in the converter below.

If you wish you can reverse the conversion by using the converter for millimeters to inches

Facts about inch (in)

An inch (plural: inches; symbol or abbreviation: in or, sometimes, ″ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. Its size can vary from system to system. There are 36 inches in a yard and 12 inches in a foot. A corresponding unit of area is the square inch and a corresponding unit of volume is the cubic inch. See all conversions for inches here.

Facts about millimetre (mm)

A millimetre (American spelling: millimeter, symbol mm) is one thousandth of a metre (the metre is the International System of Units (SI) base unit of length). The millimetre is part of a metric system. The corresponding unit of area is the square millimetre and the corresponding unit of volume is the cubic millimetre. See all conversions for millimeters here.

General information about in to mm

Other conversion pairs in length

  • Convert centimeters to inches
  • Convert centimeters to feet
  • Convert centimeters to meters
  • Convert centimeters to millimeters
  • Convert feet to centimeters
  • Convert feet to inches
  • Convert feet to meters
  • Convert feet to miles
  • Convert feet to yards
  • Convert inches to cm
  • Convert inches to feet
  • Convert kilometres to meters
  • Convert kilometers to miles
  • Convert meters to centimeters
  • Convert meters to kilometres
  • Convert meters to millimeters
  • Convert meters to feet
  • Convert meters to miles
  • Convert miles to feet
  • Convert miles to kilometres
  • Convert miles to meters
  • Convert millimeters to centimeters
  • Convert millimeters to inches
  • Convert millimeters to meters
  • Convert yards to feet

To convert inches to millimeters (in to mm), you may use the inches to mm converter above. Alternatively, to find out how many millimeters there are in "x" inches, you may use the inches to mm table.

Below, you will find information of how to find out how many mm there are in "x" inches, including the formulas and example conversions.

How many millimeters (mm) in an inch?

There are 25.4 millimeters in an inch. To convert inches to millimeters, multiply the inch value by 25.4.

For example, to find out how many millimeters there are in a half inch, multiply 0.5 by 25.4, that makes 12.7 mm in a half inch.

inches to mm formula

mm = inch * 25.4

How to convert millimeters to inches?

1 Millimeter (mm) is equal to 0.0393700787 inch (in). To convert millimeters to inches, multiply the millimeter value by 0.0393700787 or divide by 25.4.

For example, to convert 50 mm to inches, divide 50 by 25.4, that makes 1.9685 inch in 50 mm.

mm to inches formula

inch = mm * 0.0393700787

inch = mm / 25.4

What is an Inch?

Inch is an imperial and United States Customary systems unit of length. 1 inch = 25.4 mm. The symbol is "in".

What is a Millimeter?

Millimeter (millimetre) is a metric system unit of length. 1 mm = 0.0393700787 inch. The symbol is "mm".

Please visit all length units conversion to convert all length units.

Create Conversion Table

Click "Create Table". Enter a "Start" value (5, 100 etc). Select an "Increment" value (0.01, 5 etc) and select "Accuracy" to round the result.

Inches to Millimeters Converter

mm to inches ►

How to convert inches to millimeters

1 inch is equal to 25.4 millimeters:

1″ = 25.4mm

The distance d in millimeters (mm) is equal to the distance d in inches (″) times 25.4:

d(mm) = d(inch) × 25.4

Example

Convert 20 inches to millimeters:

d(mm) = 20″ × 25.4 = 508mm

How many inches in a millimeter

One millimeter is equal to 0.03937 inches:

1mm = 1mm / 25.4mm/in = 0.03937in

How many millimeters in an inch

One inch is equal to 25.4 millimeters:

1in = 25.4mm/in × 1in = 25.4mm

How to convert 10 inches to millimeterss

Multiply 10 inches by 25.4 to get millimeters:

10in = 25.4mm/in × 10in = 254mm

Inches to millimeters conversion table

Inches (")Millimeters (mm)
0.01 ″ 0.254000 mm
1/64 ″ 0.396875 mm
1/32 ″ 0.793750 mm
1/16 ″ 1.587500 mm
0.1 ″ 2.540000 mm
1/8 ″ 3.175 mm
1/4 ″ 6.35 mm
1/2 ″ 12.7 mm
1 ″ 25.4 mm
2 ″ 50.8 mm
3 ″ 76.2 mm
4 ″ 101.6 mm
5 ″ 127.0 mm
6 ″ 152.4 mm
7 ″ 177.8 mm
8 ″ 203.2 mm
9 ″ 228.6 mm
10 ″  254.0 mm
20 ″ 508.0 mm
30 ″ 762.0 mm
40 ″ 1016.0 mm
50 ″ 1270.0 mm
60 ″ 1524.0 mm
70 ″ 1778.0 mm
80 ″ 2032.0 mm
90 ″ 2286.0 mm
100 ″ 2540.0 mm

mm to inches ►


See also

  • mm to inches
  • cm to inches
  • Inches to cm

How many mm means 1 inch?

It stated that an inch is exactly 25.4 mm or 2.54 cm.

Is 20 mm the same as 1 inch?

20mm = 25/32 inch.

How many mm means 2 inch?

Inches to millimeters conversion table.

Is 18mm the same as 1 inch?

Smaller items are usually measured in milimeters as it is a more accurate measurement. ... .