Knowing how to measure quantities, values, time, distance, percentage, and accuracy is crucial to making decisions based on measurement results. It is not wrong to say modern society could not exist without measurement. From shopping to buying a small quantity, measurement is used everywhere.

Various measurement units, methods, and conversions help calculate the commodities or units within no time. Unfortunately, some students and even adults neglect the importance of measurement when they get used to its fundamentals. Every quantity in the world can be measured with the help of seven International Systems of Units, which are also the fundamental units of measurement. These are:

Quantity |
Unit |
Symbol |

Length | meter | m |

Time | second | sec |

Amount of substance | mole | mol |

Electric current | ampere | amp |

Temperature | kelvin | K |

Luminous intensity | candela | cd |

Mass | Kilogram | kg |

However, other than the International System of Units, the Imperial system is also used in many countries, such as the United States of America, Myanmar, Liberia, and many more. The units in the Imperial system, also known as the British Imperial System, are as follows:

Weight |
Capacity |
Length |
Area |
Volume |

Short ton | Gallon | Nautical mile | Square mile | Cubic yard |

Long ton | Quart | Mile | Acre | Cubic foot |

Hundredweight | Pint | Furlong | Square rod | Cubic inch |

Short hundredweight | Gill | Rod | Square yard | Acre-foot |

Long hundredweight | Fluid ounce | Fathom | Square foot | Board foot |

Pound | Fluid dram | Yard | Square inch | Cord |

Ounce | Minim | Foot | ||

Dram | Bushel | Inch | ||

Grain | Peck | |||

Stone |

**Length: The most used measuring unit in daily life **

How do you measure how long you have run on a treadmill? Or how long have you jogged around a park in the early morning? How do you measure the distance between your home from your friends’ homes? This is when length comes to the rescue. Length is commonly assumed as the largest dimension of any object among breadth, length, and height. However, it might not always be true when measuring an object in real life.

There are several units to measure length. A few of them are meter, kilometer, inch, millimeter, centimeter, yard, mile, nautical mile, foot, rod, furlong, and fathom. To compare one or more objects having different length units, there is a need to convert them into one unit for ease of calculation. So, how do we do it?

**Learning to convert one unit to another **

For basic conversions in the meter scale, remember the diagram shown below. To convert from millimeter to meter, we need to divide the given value in multiples of ten. And to convert the meter to the millimeter, we need to multiply the given value by multiples of ten.

Here are a few conversions equivalents that will help anyone to convert units between Imperial and SI:

Imperial |
SI |

1 mile | 1.6 km |

3.3 feet | 1 meter |

1 inch | 2.54 centimeter |

1 gallon | 3.79 liters |

1 fluid ounce | 30 ml |

1.102 net, or short tons (2000 pounds) | 1 metric ton (1000 kg) |

2.2 pounds | 1 kilogram |

1 ounce | 28.35 grams |

**How to convert millimeters(mm) to inches? **

Before learning to convert mm to inches, let us know what millimeters and inches are.

In 1983, the meter was defined by the 17th Conference of Weights and Measures as ‘the length of the path traveled by light in vacuum during a time interval of 1/299792458 of a second.’ Since the meter is the base unit of length, let us define millimeters in terms of meters.

A millimeter is a unit of length in the SI unit system, equivalent to 1/1000 of a meter.

A corresponding unit area is one square millimeter, and the corresponding unit volume will be a cubic millimeter. For area, it is represented as mm2, and for volume, it will be represented as mm3.

On the other hand, an inch is a unit of length mainly used in the Imperial system and the US customary measurement system. It is represented by “ symbol. For example, 4” is pronounced as 4 inches. One must make sure not to use single quotes. A single quote represents another unit, known as afoot. Moreover, an inch is represented as 1/12 of a foot and 1/36 of a yard.

So, how do we convert mm to inches? Students should remember the given conversion:

1 mm = 0.039370 inch |

Remembering this conversion rate will assist in speeding up the calculation. But for fundamental clarity, let’s see how this conversion has been done.

We know, 1 centimeter = 10 millimeter (1)

Also, 1 inch = 2.54 cm

This gives, 1 cm = 1/2.54 inch (2)

Equating both the equations, we get,

10 mm = 1/2.54 inch

Therefore, 1 mm = 1/ (2.54 x 10) inch

1 mm = 0.039370 inch

**Let us understand another method to convert this rate. **

Using unitary method in fractional form, 1 mm can be written as:

1 cm/10 mm x 1 inch/2.54 cm = 1

Canceling these units, we get 1mm = 0.039370 inches. We can use this conversion method to convert any unit.

So, if anyone asks – how many inches are there in a millimeter. The answer will be – 1 millimeter has 0.039370 inches.

And for – how many millimeters are there in an inch. The answer will be – 1 inch has 25.4 millimeters. As, 1 inch = 1/0.039370 mm = 25.4 mm

**Applications of measuring units **

- The same units of measurement help to understand architectural drawings, no matter who has made them. Moreover, if the units are standardized, a layperson can read them.
- Standardized units help in global trading. For instance, if one country has to buy goods from another, standardized conversion of units will help in the ease of trade.
- Measuring units are very helpful while doing science experiments. Imagine if the units were not the same in your textbooks. For example, a student would pour diluted sulphuric acid more than the other, leading to an accident. Therefore, having standard units is necessary.

**Learning mm to inch by examples**

Example 1: Convert 6 mm to inches.
Therefore, 6 mm will be, 6 x 0.039370 inch 6 mm = 0.23622 in
Using unitary method by fraction, we get, 1 cm/10 mm x 1 inch/2.54 cm = 10 Therefore, 10 mm = 0.39370 in
Therefore, 40 mm will be, 40 x 0.039370 inch 40 mm = 1.5748 in
1 cm/10 mm x 1 inch/2.54 cm = 50 Therefore, 50 mm = 1.9685 in |

**Given below is the conversion table that can be memorized for speedy calculations:**

Millimeters (mm) |
Inches (“) |
Inches (“) (fraction) |

0.01 mm | 0.0004 ″ | 0 ″ |

0.1 mm | 0.0039 ″ | 0 ″ |

1 mm | 0.0394 ″ | 3/64 ″ |

2 mm | 0.0787 ″ | 5/64 ″ |

3 mm | 0.1181 ″ | 1/8 ″ |

4 mm | 0.1575 ″ | 5/32 ″ |

5 mm | 0.1969 ″ | 13/64 ″ |

6 mm | 0.2362 ″ | 15/64 ″ |

7 mm | 0.2756 ″ | 9/32 ″ |

8 mm | 0.3150 ″ | 5/16 ″ |

9 mm | 0.3543 ″ | 23/64 ″ |

10 mm | 0.3937 ″ | 25/64 ″ |

20 mm | 0.7874 ″ | 25/32 ″ |

30 mm | 1.1811 ″ | 1 3/16 ″ |

40 mm | 1.5784 ″ | 1 37/64 ″ |

50 mm | 1.9685 ″ | 1 31/32 ″ |

60 mm | 2.3622 ″ | 2 23/64 ″ |

70 mm | 2.7559 ″ | 2 3/4 ″ |

80 mm | 3.1496 ″ | 3 5/32 ″ |

90 mm | 3.5433 ″ | 3 35/64 ″ |

100 mm | 3.9370 ″ | 3 15/16 ″ |

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