This chart converts metric measurements to fractional and decimal inch measurements. The metric to standard measurement conversion formula is 25.4 mm = 1 inch.

MM to inch fraction conversion calculations are approximate. For exact conversion from mm to inches a decimal inch measurement is more accurate. Fractional values are approximate while decimal values are exact.

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# MM to Inches Conversion Chart

Millimeters (mm) | Inches (fraction) | Inches (decimal) |
---|---|---|

1 mm | 3/64 " | 0.0394 " |

2 mm | 5/64 " | 0.0787 " |

3 mm | 1/8 " | 0.1181 " |

4 mm | 5/32 " | 0.1575 " |

5 mm | 13/64 " | 0.1969 " |

6 mm | 15/64 " | 0.2362 " |

7 mm | 9/32 " | 0.2756 " |

8 mm | 5/16 " | 0.3150 " |

9 mm | 23/64 " | 0.3543 " |

10 mm | 25/64 " | 0.3937 " |

20 mm | 25/32 " | 0.7874 " |

30 mm | 1 3/16 " | 1.1811 " |

40 mm | 1 37/64 " | 1.5784 " |

50 mm | 1 31/32 " | 1.9685 " |

60 mm | 2 23/64 " | 2.3633 " |

70 mm | 2 3/4 " | 2.7559 " |

80 mm | 3 5/32 " | 3.1496 " |

90 mm | 3 35/64 " | 3.5433 " |

100 mm | 3 15/16 " | 3.9370 " |

* Fractional inches are rounded to the nearest 1/64 |

## MM to Inch Conversion F.A.Q.

### What size is 10 mm in inches?

10 mm is 25/64 fractional inches and 0.3937 decimal inches.

### What is the formula to convert mm to inches?

The formula to convert mm to inches is 1 inch = 25.4 mm

### How thick is 1mm in inches?

1 mm is equal to 3/64" (0.0394 in decimal inches)

### Are mm to fraction conversions exact or approximate?

When converting from Metric(mm) to Standard(inches) a fraction represents an approximate size. Fractions are rounded to the nearest usable value which is typically 1/64.

### What size is 40mm in inches?

40 mm = 1 37/64" = 1.5784 decimal inches.

### How do you convert mm to inches?

There are 25.4 millimeters per inch. To convert metric measurements to inches divide your mm measurement by 25.4.

### How do you convert inches to millimeters?

To convert inches to millimeters multiply inches by 25.4. The formula to convert inches to millimeters is length multiplied by 25.4.