mm to inches conversion: Millimeters to Inches calculator (2024)

mm to inches (Millimeters to Inches) conversion calculator

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25.4mm = 1in

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.

Millimeters to Inches formula

Inches = Millimeters / 25.4

25.4 Millimeters to Inches calculation

Inches = Millimeters / 25.4

Inches = 25.4 / 25.4

Inches = 1

How to convert millimeters to inches

To convert mm to inches you need to divide 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 millimeters and you want to convert it to inches: divide 100 by 25.4 which gives approximately 3.937 inches.

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

Why convert inches to millimeters?

Converting inches to millimeters 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 Millimeters to Inches conversions

1mm to inches = 0.03937in

What are inches?

Inches are commonly used in the United States and the United Kingdom. An inch is defined as one twelth (1/12th) of a foot and used to measure small distances like the length of a pencil or the width of a book.

Inches are often used in construction, carpentry and engineering. They are also often found in the fashion industry for determining clothing sizes and are used to specify screen sizes for TVs and computer monitors.

To convert inches to other units you need to know the appropriate conversion factor. For example, to convert inches to centimeters you need to multiply the inch value by 2.54. To convert inches to millimeters the inch measurement is multiplied by 25.4.

Inches are used mainly in the United States but it is common to find people using inches in the United Kingdom especially for body measurements, trades and fashion. Inches are a standard worldwide in electronics and semiconductors.

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.

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.

Millimeters to Inches table

Starting value

Increment

Accuracy

Millimeters

Inches

0mm

0.00000in

1mm

0.03937in

2mm

0.07874in

3mm

0.11811in

4mm

0.15748in

5mm

0.19685in

6mm

0.23622in

7mm

0.27559in

9mm

0.35433in

10mm

0.39370in

11mm

0.43307in

12mm

0.47244in

13mm

0.51181in

14mm

0.55118in

15mm

0.59055in

16mm

0.62992in

17mm

0.66929in

18mm

0.70866in

19mm

0.74803in

Millimeters

Inches

20mm

0.78740in

21mm

0.82677in

22mm

0.86614in

23mm

0.90551in

24mm

0.94488in

25mm

0.98425in

26mm

1.02362in

27mm

1.06299in

28mm

1.10236in

29mm

1.14173in

30mm

1.18110in

31mm

1.22047in

32mm

1.25984in

33mm

1.29921in

34mm

1.33858in

35mm

1.37795in

36mm

1.41732in

37mm

1.45669in

38mm

1.49606in

39mm

1.53543in

Millimeters

Inches

40mm

1.57480in

41mm

1.61417in

42mm

1.65354in

43mm

1.69291in

44mm

1.73228in

45mm

1.77165in

46mm

1.81102in

47mm

1.85039in

48mm

1.88976in

49mm

1.92913in

50mm

1.96850in

51mm

2.00787in

52mm

2.04724in

53mm

2.08661in

54mm

2.12598in

55mm

2.16535in

56mm

2.20472in

57mm

2.24409in

58mm

2.28346in

59mm

2.32283in

Millimeters

Inches

60mm

2.36220in

61mm

2.40157in

62mm

2.44094in

63mm

2.48031in

64mm

2.51969in

65mm

2.55906in

66mm

2.59843in

67mm

2.63780in

68mm

2.67717in

69mm

2.71654in

70mm

2.75591in

71mm

2.79528in

72mm

2.83465in

73mm

2.87402in

74mm

2.91339in

75mm

2.95276in

76mm

2.99213in

77mm

3.03150in

78mm

3.07087in

79mm

3.11024in

mm to inches conversion: Millimeters to Inches calculator (2024)

FAQs

Is 25 mm the same as 1 inch? ›

1 inch = 25.4 millimeters. 1 inch = 2.54 centimeters. 1 centimeter = 10 millimeters. 100 centimeters = 1 meter.

What is the exact conversion from mm to Inches? ›

One millimeter is approximately equal to 0.0394 inches. There are 25.4 millimeters in an inch.

Is 12 mm the same as 1 inch? ›

12mm = almost 15/32 inch (= almost 1/2 inch) 13mm = just over 1/2 inch.

What is 20 mm in Inches to Inches? ›

20 mm= 0.787 inches. To convert millimeters (mm) to inches, you can use the conversion factor that 1 inch is equal to 25.4 millimeters. Therefore, 20 mm is approximately 0.7874 inches.

What is 1 inch in mm exactly? ›

1 Inches = 25.4 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

How many mm is 1 ⁄ 8 inch? ›

3.18 mm

What is the formula for converting mm to inches? ›

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.

What does 10 mm look like? ›

To give you an idea of what 10 millimeters look like, it's roughly the width of a standard paperclip or about the diameter of a large staple. It's a very small measurement, and often objects of this size are challenging to perceive with the naked eye.

Is 1 inch the same as 20 mm? ›

To convert millimeters to inches, the conversion factor used is 1 inch equals 25.4 millimeters.

What is 10 mm compared to 1 inch? ›

Millimeters to inches conversion table
Millimeters (mm)Inches (") (decimal)Inches (") (fraction)
10 mm0.3937 ″25/64 ″
20 mm0.7874 ″25/32 ″
30 mm1.1811 ″1 3/16 ″
40 mm1.5748 ″1 37/64 ″
17 more rows

What does 5 mm look like? ›

Tumor sizes are often measured in millimeters (mm) or centimeters. Common items that can be used to show tumor size in mm include: a sharp pencil point (1 mm), a new crayon point (2 mm), a pencil-top eraser (5 mm), a pea (10 mm), a peanut (20 mm), and a lime (50 mm).

What size is 7 mm in inches? ›

Millimeters to Inches Conversion Chart
MillimetersInches
7 mm0.2756"
8 mm0.3150"
9 mm0.3543"
10 mm0.3937"
30 more rows

Is 40 mm one inch? ›

If you want to convert its value into inches, here is the calculation. 40 mm to inches = 40 X 0.039 = 1.56 inches. Objects that need exact measurements are usually measured in millimeters.

What is the standard equivalent to 25 mm? ›

Metric / Standard Wrench Conversion Chart
Bolt DiameterMetricStandard
5/8"24mm15/16"
25mm1"
3/4"29mm1-1/8"
32mm1-1/4"
39 more rows
Mar 4, 2020

How many inches is 25mm? ›

25 Millimeters to Inches equals 0.9843 in.

Convert 25 Millimeters to Inches (mm to in) with our conversion calculator.

Is 25 mm the size of a quarter? ›

Mint legal tender coins. Quarter: 0.955 inches diameter, 1.75 inches thickness. What is a quarter size? A United States 25-cent piece, a quarter dollar, is 24.26 mm in diameter.

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