# How Many MM In An Inch

Inches to Millimeters Conversion

How many millimeters in an inch?

Inches to millimeters length units conversion factor is 25.4. To find out how many millimeters in inches, multiply the inch value by 25.4 or use the converter.

1 Inch = 25.4 Millimeters

There are 25.4 millimeters in an inch, because for both imperial and US customary measurement systems, one foot is defined as 30.48 centimeters (or 304.8 millimeters) exactly by an international agreements and there are 12 inches in a foot, that makes 304.8 / 12 = 25.4 mm in an inch.

For example, to find out how many millimeters there are in an inch and a half, multiply the inch value by the conversion factor, that makes 1.5 * 25.4 = 38.1 millimeters in 1.5 inches.

Inch is an imperial and US customary measurement systems length unit. 1 inch equals to 25.4 millimeters and 2.54 centimeters. The abbreviation is "in".

Are You Know?
World's oldest known killer whale Granny dies
Hitler's 'Mein Kampf' becomes German bestseller
Dinosaur extinction factor may have been how long eggs took to hatch

Millimeter is a metric length unit and equal to one thousandth of a meter. It is used to measure small distances in engineering and machining. The abbreviation is "mm".

Definition: Millimeter
Millimeter (symbol: mm) is a length unit in the SI (International System of Units). A millimeter equals to one thousandth of a meter.

Definition: Inch
Inch (symbol: in) is a length unit in the imperial and US customary systems of measurement. Since 1959, an inch was defined to be equivalent to 25.4 millimeters exactly in 1959. There are 12 inches in a foot and 36 inches in a yard.

Length, Distance, Height & Depth units

Distance in the metric sense from any two A to Z points (interchangeable with Z and A), also applies to physical lengths, depths, heights or simply farness. Tool with multiple distance, depth and length measurement units.
Convert length measuring units between inch (in) and millimeters (mm) but in the other reverse direction from millimeters into inches.

Converter type: length units

This online length from in into mm converter is a handy tool not just for certified or experienced professionals.
First unit: inch (in) is used for measuring length.

Second: millimeter (mm) is unit of length.

25.40 mm is converted to 1 of what?

The millimeters unit number 25.40 mm converts to 1 in, one inch. It is the EQUAL length value of 1 inch but in the millimeters length unit alternative.

How to convert 2 inches (in) into millimeters (mm)? Is there a calculation formula?

First divide the two units variables. Then multiply the result by 2 - for example:
25.4 * 2 (or divide it by / 0.5)

QUESTION:
1 in = ? mm

1 in = 25.40 mm
Other applications for this length calculator ...

With the above mentioned two-units calculating service it provides, this length converter proved to be useful also as a teaching tool:
1. in practicing inches and millimeters ( in vs. mm ) values exchange.
2. for conversion factors training exercises between unit pairs.
3. work with length's values and properties.

International unit symbols for these two length measurements are:

Abbreviation or prefix ( abbr. short brevis ), unit symbol, for inch is:
in

Abbreviation or prefix ( abbr. ) brevis - short unit symbol for millimeter is:
mm

One inch of length converted to millimeter equals to 25.40 mm

How many millimeters of length are in 1 inch? The answer is: The change of 1 in ( inch ) unit of length measure equals = to 25.40 mm ( millimeter ) as the equivalent measure for the same length type.

In principle with any measuring task, switched on professional people always ensure, and their success depends on, they get the most precise conversion results everywhere and every-time. Not only whenever possible, it's always so. Often having only a good idea ( or more ideas ) might not be perfect nor good enough solution. If there is an exact known measure in in - inches for length amount, the rule is that the inch number gets converted into mm - millimeters or any other length unit absolutely exactly.