Convert inches to mm (2024)

Convert inches to mm (1)

Home / Length Conversion / Convert inches to mm

Please provide values below to convert inch [in] to millimeter [mm], or vice versa.


Inch

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

History/origin: The term "inch" was derived from the Latin unit "uncia" which equated to "one-twelfth" of a Roman foot.

There have been a number of different standards for the inch in the past, with the current definition being based on the international yard. One of the earliest definitions of the inch was based on barleycorns, where an inch was equal to the length of three grains of dry, round barley placed end-to-end. Another version of the inch is also believed to have been derived from the width of a human thumb, where the length was obtained from averaging the width of three thumbs: a small, a medium, and a large one.

Current use: The inch is mostly used in the United States, Canada, and the United Kingdom. It is also sometimes used in Japan (as well as other countries) in relation to electronic parts, like the size of display screens.

Millimeter

Definition: A millimeter (symbol: mm) is a unit of length in the International System of Units (SI). It is defined in terms of the meter, as 1/1000 of a meter, or the distance traveled by light in 1/299 792 458 000 of a second.

History/origin: The milli- prefix is one of many metric prefixes. It indicates one thousandth of the base unit, in this case the meter. The definition of the meter has changed over time, the current definition being based on the distance traveled by the speed of light in a given amount of time. The relationship between the meter and the millimeter is constant however. Prior to this definition, the meter was based on the length of a prototype meter bar. In 2019, the meter has been re-defined based on the changes made to the definition of a second.

Inch to Millimeter Conversion Table

Inch [in]Millimeter [mm]
0.01 in0.254 mm
0.1 in2.54 mm
1 in25.4 mm
2 in50.8 mm
3 in76.2 mm
5 in127 mm
10 in254 mm
20 in508 mm
50 in1270 mm
100 in2540 mm
1000 in25400 mm

How to Convert Inch to Millimeter

1 in = 25.4 mm
1 mm = 0.0393700787 in

Example: convert 15 in to mm:
15 in = 15 × 25.4 mm = 381 mm

Popular Length Unit Conversions

cm to inches

inches to cm

mm to inches

inches to mm

meters to feet

feet to meters

km to miles

miles to km

cm to feet

feet to cm

inches to feet

feet to inches

meters to yards

yards to meters

mm to cm

cm to mm

cm to m

m to cm

cm to km

km to cm

mm to feet

feet to mm

meters to miles

miles to meters

feet to miles

miles to feet

yards to feet

inches to meters

meters to inches

mm to m

m to mm

km to m

m to km

inches to yards

yards to inches

yards to miles

miles to yards


Convert Inch to Other Length Units

inches to meters

Inch to Kilometer

Inch to Decimeter

inches to cm

Inch to Micrometer

Inch to Nanometer

Inch to Mile

inches to yards

inches to feet

Inch to Light Year

Inch to Break

Inch to Exameter

Inch to Petameter

Inch to Terameter

Inch to Gigameter

Inch to Megameter

Inch to Hectometer

Inch to Dekameter

Inch to Micron

Inch to Picometer

Inch to Femtometer

Inch to Attometer

Inch to Megaparsec

Inch to Kiloparsec

Inch to Parsec

Inch to Astronomical Unit

Inch to League

Inch to Nautical League (UK)

Inch to Nautical League (int.)

Inch to League (statute)

Inch to Nautical Mile (UK)

Inch to Nautical Mile (international)

Inch to Mile (statute)

Inch to Mile (US Survey)

Inch to Mile (Roman)

Inch to Kiloyard

Inch to Furlong

Inch to Furlong (US Survey)

Inch to Chain

Inch to Chain (US Survey)

Inch to Rope

Inch to Rod

Inch to Rod (US Survey)

Inch to Perch

Inch to Pole

Inch to Fathom

Inch to Fathom (US Survey)

Inch to Ell

Inch to Foot (US Survey)

Inch to Link

Inch to Link (US Survey)

Inch to Cubit (UK)

Inch to Hand

Inch to Span (cloth)

Inch to Finger (cloth)

Inch to Nail (cloth)

Inch to Inch (US Survey)

Inch to Barleycorn

Inch to Mil

Inch to Microinch

Inch to Angstrom

Inch to A.u. Of Length

Inch to X-unit

Inch to Fermi

Inch to Arpent

Inch to Pica

Inch to Point

Inch to Twip

Inch to Aln

Inch to Famn

Inch to Caliber

Inch to Centiinch

Inch to Ken

Inch to Russian Archin

Inch to Roman Actus

Inch to Vara De Tarea

Inch to Vara Conuquera

Inch to Vara Castellana

Inch to Cubit (Greek)

Inch to Long Reed

Inch to Reed

Inch to Long Cubit

Inch to Handbreadth

Inch to Fingerbreadth

Inch to Planck Length

Inch to Electron Radius (classical)

Inch to Bohr Radius

Inch to Earth's Equatorial Radius

Inch to Earth's Polar Radius

Inch to Earth's Distance From Sun

Inch to Sun's Radius

Convert inches to mm (2024)

FAQs

Convert inches to mm? ›

1 inch = 25.4mm

How do you convert inches to mm? ›

To convert inches to mm, you must multiply the unit by 25.4. For instance, if you have to convert 10 inches to mm, you need to multiply 10 with 25.4.

How many mm are in 1 inch exactly? ›

1 inch = 25.4 millimeters. 1 inch = 2.54 centimeters. 1 centimeter = 10 millimeters.

How to convert mm into inches formula? ›

Ans : Because one inch is 25.4 millimetres long, the length in inches is millimetres divided by 25.4. The length divided by 25.4 is the formula for converting millimetres to inches.

How many mm is 1 ⁄ 8 inch? ›

3.18 mm

What is 1 mm equal to in inches? ›

1 mm = 0.0393701 inches.

How many mm is 1 ⁄ 4 inch? ›

To convert 1/4 inch to mm, divide 1 by 4 to convert the fraction to a decimal. Then, multiply that by 25.4 since there are 25.4 millimeters in one inch. That's the formula that our calculator uses to find that 1/4 inch to millimeters is 6.35 mm.

Is 30 mm equal to 1 inch? ›

How do you convert millimeters to inches? Since there are 25.4 millimeters in one inch, the length in inches is equal to millimeters divided by 25.4.

How many mm is 1 ⁄ 2 inch? ›

Inches to millimeters conversion table
Inches (")Millimeters (mm)
1/4 ″6.35 mm
1/2 ″12.7 mm
1 ″25.4 mm
2 ″50.8 mm
23 more rows

What is the exact mm in inch? ›

One millimeter is equal to 0.0393701 inches. The millimeter, or millimetre, is a multiple of the meter, which is the SI base unit for length.

Is 1 inch exactly 25.4 mm? ›

Standards for the exact length of an inch have varied in the past, but since the adoption of the international yard during the 1950s and 1960s the inch has been based on the metric system and defined as exactly 25.4 mm.

What is 7 ⁄ 8 inches in mm? ›

To convert 7/8 inch to mm, divide 7 by 8 to convert the fraction to a decimal. Then, multiply that by 25.4 since there are 25.4 millimeters in one inch. That's the formula that our calculator uses to find that 7/8 inch to millimeters is 22.225 mm.

Is 20 mm the same as 1 inch? ›

Answer: 20 millimeters is equal to approximately 0.7874 inches. Here's how the calculation is done: Given Measurement: 20 mm. Conversion Factor: 1 inch = 25.4 mm.

References

Top Articles
Latest Posts
Article information

Author: Jamar Nader

Last Updated:

Views: 6455

Rating: 4.4 / 5 (55 voted)

Reviews: 86% of readers found this page helpful

Author information

Name: Jamar Nader

Birthday: 1995-02-28

Address: Apt. 536 6162 Reichel Greens, Port Zackaryside, CT 22682-9804

Phone: +9958384818317

Job: IT Representative

Hobby: Scrapbooking, Hiking, Hunting, Kite flying, Blacksmithing, Video gaming, Foraging

Introduction: My name is Jamar Nader, I am a fine, shiny, colorful, bright, nice, perfect, curious person who loves writing and wants to share my knowledge and understanding with you.