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Millimeters and Inches (mm & in) Converter

tape measure for mm and inches - icon

Use this tool to convert quickly between millimeters/millimetres and inches (mm and in), or vice-versa, with results given as both decimal and fraction. If you're converting mm to inches, you can choose to have a fraction result in 1/16, 1/32 and 1/64 inch if you wish.

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Disclaimer

Whilst every effort has been made in building this millimeters and inches conversion tool, we are not to be held liable for any special, incidental, indirect or consequential damages or monetary losses of any kind arising out of or in connection with the use of the converter tools and information derived from the web site. This millimeters and inches conversion tool is here purely as a service to you, please use it at your own risk. Do not use calculations for anything where loss of life, money, property, etc could result from inaccurate conversions.

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How many inches in a mm?

1mm = 0.03937008 inches. To convert mm to inches you need to divide your figure by 25.4.

mm to inches as fraction

The converter on this page allows you to show results as fractions in 1/16, 1/32 and 1/64 inch for millimeter to inch conversions. It is important to note that when you choose this option, the converter will round (up or down) and give you a remainder figure (the difference between the fraction and the full result). For this reason, the fraction result will be slightly smaller or slightly larger.

How many mm in an inch?

1 inch = 25.4mm. To convert inches to millimeters multiply your figure by 25.4. The chart below shows some example conversions, rounded to a maximum of 4 decimal places. Should you wish to convert between centimeters and inches, give the cm to inches converter a try.

How many mm in an inch and a half?

1 1/2 inches = 38.1 mm. To get this answer, we simply multiply: 25.4 × 1.5.

Millimeters and inches conversion charts

The chart below shows the conversion between millimeters and inches, rounded to a maximum of 4 decimal places (first table) and 3 decimal places (second table).

Conversion of mm to inches
Millimeters Inches (decimal) Inches (fraction approx)
1mm 0.0394 in 1/32 inch
10mm 0.3937 in 25/64
20mm 0.7874 in 25/32
30mm 1.1811 in 1 3/16
40mm 1.5748 in 1 37/64
50mm 1.9685 in 1 31/32
60mm 2.3622 in 2 23/64
70mm 2.7559 in 2 3/4
80mm 3.1496 in 3 5/32
90mm 3.5433 in 3 35/64
100mm 3.937 in 3 15/16

Note: fraction figures for inches are approximate.

Conversion of inches to mm
Inches Millimeters Inches Millimeters
1/64 inch 0.397 mm 1/32 inch 0.794 mm
1/16 inch 1.588 mm 0.1 inch 2.54 mm
1/8 inch 3.175 mm 1/4 inch 6.35 mm
1/2 inch 12.7 mm 3/4 inch 19.05 mm
1 inch 25.4 mm 5 inches 127 mm
10 inches 254 mm 20 inches 508 mm
30 inches 762 mm 40 inches 1016 mm
50 inches 1270 mm 60 inches 1524 mm
70 inches 1778 mm 80 inches 2032 mm
90 inches 2286 mm 100 inches 2540 mm

Note: conversions are rounded to maximum 3 decimal places.

My conversion tool can help you convert between millimeters and inches. Should you wish to convert between inches and centimeters, see the inches and cm converter. For other units of height, you may wish to use the height calculator here.


If you have any suggestions or queries about this conversion tool, please contact me.