Inch to mm conversion: inches to millimeters calculator (2024)

Inch to mm (inches to millimeters) conversion calculator

mm to inches (Swap units) Buy digital tape measures here (sponsored link)

1in = 25.4mm

Note: You can increase or decrease the accuracy of this answer by selecting the number of significant figures required from the options above the result.

Inches to Millimeters conversion formula

Millimeters = Inches * 25.4

Inches to Millimeters calculation

Millimeters = Inches * 25.4

Millimeters = 1 * 25.4

Millimeters = 25.4

How do you convert inches to millimeters?

To convert inches to mm you need to multiply the value in mm by 25.4 as there are this many millimeters in an inch.

For example, suppose you have a length of 100 inches and you want to convert it to millimeters: multiply 100 by 25.4 which gives you 2,540mm.

To make the conversion easier, you can use the inches to millimeters conversion calculator provided on this page. This tool will calculate the value for you and you can also enter the inch value in fractional form if required. It is important to note that when converting between inches and millimeters, it is always a good idea to round the result to the desired level of precision, depending on the context of the measurement.

Why would one convert inches to millimeters?

Converting millimeters to inches is a common task in engineering, manufacturing and construction.

Inches are imperial measurements that are normally used in the United States and United Kingdom. Millimeters are a unit of the metric system used worldwide. It is often necessary to convert inches to millimeters when following instructions of specifications in a unit unfamiliar to you.

Millimeters are used where high precision is required such as machining and fabrication. The smaller unit the simpler it is to allow for finer measurements. The metric system offers a logical system of measurement as converting between other metric units are simple and they are based on factors of 10.

What are millimeters?

Millimeters are a small unit of length measurement in the metric system. One millimeter is equal to a thousandth of a meter. This means that millimeters are used when measuring small distances or dimensions such as the thickness of a sheet of paper or a small object.

Millimeters are widely used worldwide especially in engineering. They provide a convenient unit of measurement for fine details.

Millimeters are used in the fashion industry for jewelry and fabric widths. Millimeters are also used in meteorology to record rainfall or snowfall.

1000mm is equal to a meter which is the SI unit of length.

Some common Inches to Millimeters conversions

1/4 inch to mm = 6.35mm

3/8 inch to mm = 9.525mm

3/8 to mm = 9.525mm

1/2 inch to mm = 12.7mm

3/4 inch to mm = 19.05mm

1 inch to mm = 25.4mm

1 1/4 inch to mm = 31.75mm

1 1/4 to mm = 31.75mm

2 inches to mm = 50.8mm

3 inches to mm = 76.2mm

4 inches to mm = 101.6mm

5 inches to mm = 127mm

6 inches to mm = 152.4mm

What are inches?

Inches are mainly used in the United States as well as sometimes in the United Kingdom.

An inch is an imperial unit which is primarily used in the United States. It is defined as a twelth (1/12th) of a foot. Inches are used to measure smaller distances such as the length of a pencil or the width of a book. Rather than using decimals, Inches are often divided into fractions such as halves, quarters, and eighths.

Converting inches to centimeters involves multiplying by the conversion factor 2.54. For example, 100 inches would be 254 centimeters. The reverse is also true, to convert centimeters to inches you divide the number of centimeters by 2.54. For example, 50 centimeters would be approximately 19.69 inches.

Is there a simple way to convert inches to mm?

The actual formula is mm = in * 25.4 which is approximately multiply by 25. If you multiply the amount of inches by 100 and then divide by 4 you will get an approximate answer. Worked Example: 3 inch x 300 = 100, 300 / 4 = 75mm. This method is close enough for many purposes.

What is the symbol for inches?

The ISO symbol for inch is "in", but it's frequently marked as a double prime ("). Feet is often marked as a single prime ('). So 5 feet 3 inches can be marked as 5' 3".

What size is 1 inch in MM?

There are 25.4mm in one inch.

How many Inches are in 1 Millimeter?

There are 0.03908 Inches in 1 Millimeter

How long is 1 Inch?

1 inch - A normal-sized paperclip

2 inches - An AA battery

3 inches - The length of a standard post-it note

8 inches - Approx. length of a standard house brick, or a standard paperback book

8 -9 Inches - Approx length of a normal dinner knife

12 inch - A standard school ruler

How long is 1 Millimeter?

2 Millimeters - A grain of short rice

5 Millimeters - The eraser on the end of a pencil

55 Millimeters - Height of a debit/credit/charge card

86.6 Millimeters - Length of a debit/credit/charge card

120 Millimeters - Width of a standard CD

300 Millimeters - A standard (30cm) ruler

What are the most common misspellings of Millimeters?

Millimetre (not actually a mis-spelling - this is the British English spelling)

Milimeter

Can I do the opposite conversion - ie Millimeters to Inches - on this site?

Yes - just click here to use our Millimeters to Inches calculator

What is the difference between Millimetres and Millimeters?

There is no difference between Millimeters and Millimetres - they are just different ways of spelling the same thing. Millimetres is the British English spelling, and Millimeters is the American English spelling.

Is 5 mm equal to 1/2 inch?

No, 5mm is 0.19685 inch (or 13/64 inch). A half inch is 12.7mm.

How many mm is 1 ⁄ 4 inch?

1⁄4 inch is 6.35mm - please see this page: 1/4 inch in mm

What is 4 inches as mm?

4 inches as mm = 101.6mm

Which countries use inches?

The United States is the most notable country that uses inches but a large number of people still use them in the United Kingdom as well. In the US, inches are the standard in construction and engineering. Inches are also common in determining a person's height or the size of television screens.

Although the UK has officially adopted the metric system, inches are still found in certain area particularly in construction. This is due to the historical influence of the imperial system. In the UK inches are also used for body height and objects that were traditionally measured this way such as vinyl records.

Which countries use millimeters?

A majority of countries worldwide have adopted the metric system and as such use millimeters.

In these countries millimeters are the preferred unit for measuring dimensions of building materials, such as pipes, beams, and panels. Millimeters are found in manufacturing for precision measurements, machinery, and tools. Millimeters are also used in medicine and are used in the fashion and textile industry.

Inches to Millimeters table

Starting value

Increment

Accuracy

Inches

Millimeters

0in

0.00000mm

1in

25.40000mm

2in

50.80000mm

3in

76.20000mm

4in

101.60000mm

5in

127.00000mm

6in

152.40000mm

7in

177.80000mm

8in

203.20000mm

9in

228.60000mm

10in

254.00000mm

11in

279.40000mm

12in

304.80000mm

13in

330.20000mm

14in

355.60000mm

15in

381.00000mm

16in

406.40000mm

17in

431.80000mm

18in

457.20000mm

19in

482.60000mm

Inches

Millimeters

20in

508.00000mm

21in

533.40000mm

22in

558.80000mm

23in

584.20000mm

24in

609.60000mm

26in

660.40000mm

27in

685.80000mm

28in

711.20000mm

29in

736.60000mm

30in

762.00000mm

31in

787.40000mm

32in

812.80000mm

33in

838.20000mm

34in

863.60000mm

35in

889.00000mm

36in

914.40000mm

37in

939.80000mm

38in

965.20000mm

39in

990.60000mm

Inches

Millimeters

40in

1,016.00000mm

41in

1,041.40000mm

42in

1,066.80000mm

43in

1,092.20000mm

44in

1,117.60000mm

45in

1,143.00000mm

46in

1,168.40000mm

47in

1,193.80000mm

48in

1,219.20000mm

49in

1,244.60000mm

50in

1,270.00000mm

51in

1,295.40000mm

52in

1,320.80000mm

53in

1,346.20000mm

54in

1,371.60000mm

55in

1,397.00000mm

56in

1,422.40000mm

57in

1,447.80000mm

58in

1,473.20000mm

59in

1,498.60000mm

Inches

Millimeters

60in

1,524.00000mm

61in

1,549.40000mm

62in

1,574.80000mm

63in

1,600.20000mm

64in

1,625.60000mm

65in

1,651.00000mm

66in

1,676.40000mm

67in

1,701.80000mm

68in

1,727.20000mm

69in

1,752.60000mm

70in

1,778.00000mm

71in

1,803.40000mm

72in

1,828.80000mm

73in

1,854.20000mm

74in

1,879.60000mm

75in

1,905.00000mm

76in

1,930.40000mm

77in

1,955.80000mm

78in

1,981.20000mm

79in

2,006.60000mm

Inch to mm conversion: inches to millimeters calculator (2024)

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