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Conversion table inch to cm and mm

Made by : Perles & Co
Published on the :12/10/2015
Conversion table inch to cm and mm
In summary

The inch, or inch, is equivalent to 25.40 mm and is mainly used in countries such as the UK and USA for various measurements. Among the wires available, Soft Flex cabled wire has a diameter of 0.48 mm (0.019 inch), Gold Filled round flexible wire measures 1.29 mm (0.0507 inch) and 316L stainless steel wire is 0.81 mm (0.032 inch). To convert from inches to millimeters, multiply the number of inches by 25.4.

How big is an inch?

Do you often come across measurements in inches on your wires or cables, and don't know what they correspond to in millimeters? This guide explains it all, and the conversion table will help you with every order!

What is an inch?

The inch is a unit of length that dates back to the Middle Ages and corresponded to the length of one inch. Although this value system has been abandoned in many countries.

Today, the inch is still used in several Anglo-Saxon countries, including :

  • the United States
  • United Kingdom
  • Canada

It's a measurement used for the diameter of wires, such as metal wires and cabled wires, notably by American brands such as Soft Flex, Beadalon or Artistic Wire, the dimensions of screens, the resolution of printers or the sizes of certain garments such as jeans. It is indicated by the abbreviation '' (double prime) or by the two letters in. You may also have seen it written inches, which is simply the plural of inch.

How do I convert inches into mm?

The formula is simple:

  • 1 inch = 25.40 mm = 2.54 cm

To convert any measurement, simply multiply by 2.54 (to obtain centimetres) or by 25.4 (to obtain millimetres).
Example: a wire of 0.019 inch × 25.4 = 0.48 mm

Conversion table inch to mm

INCH (inch)CM
MM
12.5425.40
25.0850.80
37.6276.20
410.16101.60
512.7127
615.24152.40
717.78177.80
820.32203.20
922.86228.60
1025.4254
1127.94279.40
1230.48304.80
3691.44914.40
1/40.6356.35
1/21.2712.70
3/41.90519.05
1/80.31753.175
3/80.95259.525
5/81.587515.875
7/82.222522.225
1/160.158751.5875
3/160.476254.7625
5/160.793757.9375
7/161.1112511.1125
9/161.4287514.2875
11/161.7462517.4625
13/162.0637520.6375
15/162.3812523.8125
1/320.0793750.79375
3/320.2381252.38125
5/320.3968753.96875
7/320.5556255.55625
11/320.7143757.14375
13/320.8731258.73125
15/321.03187510.31875
17/321.34937513.49375
19/321.50812515.08125
21/321.66687516.66875
23/321.82562518.25625
25/321.98437519.84375
27/322.14312521.43125
29/322.30187523.01875
31/322.46062524.60625

Concrete examples with our wires

To better understand how to use this chart in your creations, here are a few matches taken directly from our catalog:

fil soft flexfil gold filledfil câblé

Inch and gauge: two systems, one logic

If you work with American wires, you'll often come across these two units side by side:

  • Gauge (AWG) indicates the wire gauge (the larger the number, the thinner the wire).
  • Inch indicates actual diameter in inches

Both convert to millimeters: see also our gauge to mm conversion chart for easy navigation between the two systems.

And if you're wondering how to choose the right wire diameter for your project, our guide on how to choose the right wire diameter will help you see things even more clearly.

What's an inch in mm?

An inch corresponds exactly to 25.40 mm, or 2.54 cm. It's an Anglo-Saxon unit of measurement still widely used in the United States and the United Kingdom to express the diameter of wires, among other things.

How do I convert inches into millimeters?

Simply multiply the value in inches by 25.4 to obtain millimeters. For example: 0.025 inch × 25.4 = 0.635 mm. Our table above makes this calculation for the most common jewelry values.

What's the difference between inch and gauge for a wire?

These two units measure the same thing (the diameter of a wire), but in different ways. Inch expresses the measurement directly in decimal inches, while AWG uses an inverted scale (the larger the number, the thinner the wire). Both convert to millimeters.

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Your questions (8)
You have a question about this sheet? Ask our team and the people who have already tested it. The Perles & Co community is here to help!
By Princess (10/01/2026 19:03:00)
C'est quoi 2 pouses
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Our Lucie expert answers you (12/01/2026 09:43:52)
Bonjour, vous pouvez voir avec le tableau que 2 pouces correspondent à 5,08 cm.
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By Annie (02/01/2026 13:32:14)
Bonjour, 55 inch correspond à combien de pouces pour une tv ? Merci
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Our Lucie expert answers you (02/01/2026 15:35:39)
Bonjour, 55 inch correspond à 55 pouces. Merci
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By May (17/11/2025 06:21:12)
En Amérique quel qu un mesure 5’2 et je veux savoir ceux nombre combien fait en Belgique
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Our Lucie expert answers you (17/11/2025 09:54:05)
En Amérique, 5’2" (5 pieds 2 pouces) correspond à 1.57m (exactement 157.5 cm) Merci
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By Pilato (21/09/2025 10:32:58)
3,4 pollici quanti millimetri sono?
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Our Lucie expert answers you (22/09/2025 08:55:49)
Buongiorno, in millimetri sono 76,2 mm.
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By Fournier Marc (07/01/2025 20:15:06)
134 size en cm =
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Our Tiffanie expert answers you (08/01/2025 08:44:03)
Bonjour, quelle est la question ?
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Credits

Perles & Co, Internet & E-Commerce company [12/10/2015] Any reproduction, representation, adaptation, in any form whatsoever, even partial, is prohibited, except for reproduction for private use not intended for collective use, representation in the family circle (art. L 122-5 CPI) and online publishing on condition that the source is mentioned and a link is included to the corresponding page of our site www.perlesandco.com.