Convert Millimeter to Inch (mm to in)

In next fields, kindly type your value in the text box under title [ From: ] to convert from millimeter to inch (mm to in). As you type your value, the answer will be automatically calculated and displayed in the text box under title [ To: ].


Millimeter (abbreviation: mm): is a unit of length in the SI metric system, equal to one thousandth of a metre. Therefore, there are thousand millimetres in a metre and ten millimetres in a centimetre.

Inch (abbreviation: in): is a unit of length in the (British) imperial and United States customary systems of measurement now formally equal to 1/36 yard but usually taken as 1/12 of a foot.

How to Convert Millimeters to Inches

Example: How many inches are equivalent to 1.1 millimeters?


1 millimeters = 0.03937 inches

1.1 millimeters = Y inches

Assuming Y is the answer, and by criss-cross principle;

Y equals 1.1 times 0.03937 over 1

(i.e.) Y = 1.1 * 0.03937 / 1 = 0.043307 inches

Answer is: 0.043307 inches are equivalent to 1.1 millimeters.

Practice Question: Convert the following units into in:

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 82.9 mm

( ii ) 65.45 mm

( iii ) 51.96 mm

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  • USMA
  • NIST

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