Have you ever found yourself trying to convert millimeters (mm) to inches, unsure of the correct formula for doing so? If so, you’re in the right place!

In this blog post, **Math Prof** will explain how to quickly and accurately convert from **mm to inch** measurement units. We’ll also provide some additional background on why it is important to understand both metric and imperial systems of measurements and when each is best used.

Whether you’re a professional engineer or an everyday consumer looking to understand the difference between millimetres and inches better, this blog post should help answer all your questions. So read on and get ready for a crash course in conversion!

## Convert mm to inch

mm to inch formula: 1 mm / 25.4 = 0.0393701 inches

### mm to inch Conversion table / chart

mm | inch |

0.1 | 0.0039370078740157 |

0.2 | 0.0078740157480315 |

0.3 | 0.011811023622047 |

0.4 | 0.015748031496063 |

0.5 | 0.019685039370079 |

0.6 | 0.023622047244094 |

0.7 | 0.02755905511811 |

0.8 | 0.031496062992126 |

0.9 | 0.035433070866142 |

1 | 0.039370078740157 |

1.1 | 0.043307086614173 |

1.2 | 0.047244094488189 |

1.3 | 0.051181102362205 |

1.4 | 0.05511811023622 |

1.5 | 0.059055118110236 |

1.6 | 0.062992125984252 |

1.7 | 0.066929133858268 |

1.8 | 0.070866141732283 |

1.9 | 0.074803149606299 |

## What is mm?

### Definition

A millimeter (mm) is a metric unit of length that is equal to one thousandth of a meter. It is equivalent to 0.03937 inches, or 25.4 millimeters in an inch.

### Usage

Millimeters are used for measuring small objects, such as the thickness of paper or the diameter of a wire. Millimeters are also commonly used in construction and engineering for precise measurements and calculations.

In countries that use the metric system, millimeters are often seen on rulers and tape measures. They may also be found in scientific equipment such as microscopes and calipers.

So, **what is an inch**?

## What is an inch?

### Definition

The inch (in) is a unit of length in the imperial and US customary systems of measurement. One inch is equal to 25.4 millimeters, or 2.54 centimeters, 0.083 feet, or 0.027 meters.

### Usage

Inches are commonly used for measuring small objects such as paper thickness, diameters, lengths of screws and bolts, etc. It is also used in construction and engineering.

In countries that use the imperial system of units, inches may be seen on rulers or tape measures. They may also be found in medical equipment such as thermometers or stethoscopes.

## The distinction between mm and in

The main difference between millimeters and inches is that millimeters are part of the **metric system**, whereas inches are part of the imperial and US customary systems. One millimeter is equivalent to 0.03937 inches, or 25.4 millimeters in an inch.

Millimeters are typically used for measuring small objects, while inches are often used for larger objects. Additionally, centimeters may be more common in countries that use the metric system, while inches may be more common in countries that use the imperial and US customary systems.

## F.A.Q. mm to inch

### How many millimeters equal one inch?

One inch is equal to 25.4 millimeters.

### Is 5 mm the same as 1 1/4 inches?

No, 5 millimeters is equal to 0.197 inches, which is slightly less than 1/4 inch.

### What size is 20 inches in mm?

20 inches are equal to 508 millimeters.

### How much is 2 to 3 mm in inches?

2 to 3 millimeters is equal to 0.0787 to 0.1181 inches.

## Conclusion

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