Millimeters to Inches Converter mm → in

1 millimeter (mm) = 0.03937007874 inches (in). Type a value below — the conversion happens instantly, entirely on your device.

From

1 mm = 0.03937007874 in

Precision

1 millimeters = 0.039370079 inches

1 × 0.0393701 = 0.039370079

1 mm equals 0.0393701 in, so multiplying by 0.0393701 converts the value. The result describes the exact same quantity — only the measuring stick changes.

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How to convert millimeters to inches

inches = millimeters × 0.03937007874 — multiply the millimeter value by 0.0393701.

Example: 10 mm = 0.393701 in.

To convert the other way: millimeters = inches ÷ 0.03937007874 — or use the dedicated in to mm converter .

Millimeters to Inches conversion table

Millimeters (mm)	Inches (in)
0.1	0.0039370079
0.25	0.0098425197
0.5	0.019685039
1	0.039370079
2	0.078740157
3	0.11811024
4	0.15748031
5	0.19685039
6	0.23622047
7	0.27559055
8	0.31496063
9	0.35433071
10	0.39370079
15	0.59055118
20	0.78740157
25	0.98425197
30	1.1811024
40	1.5748031
50	1.9685039
75	2.9527559
100	3.9370079
250	9.8425197
500	19.685039
1000	39.370079

About the units

What is a millimeter?

A millimeter (mm) is one thousandth of a meter, the SI base unit of length. It is commonly used for small measurements such as paper thickness, screw sizes and rainfall.

What is a inch?

An inch (in) is an imperial and US customary unit defined as exactly 25.4 millimeters since 1959. Twelve inches make one foot; screens, wheels and paper sizes are commonly measured in inches.

Frequently asked questions

How many inches are in 1 millimeter?

1 millimeter (mm) = 0.03937007874 inches (in).

What is the formula to convert millimeters to inches?

inches = millimeters × 0.03937007874 — multiply the millimeter value by 0.0393701.

How do I convert mm to in without a calculator?

Multiply by 0.0394 for a close estimate. Exact factor: 1 mm = 0.03937007874 in.

Is this mm-to-in converter accurate and private?

Yes. It uses the exact internationally defined conversion factors and computes results locally in your browser — your input is never sent to a server, and the page keeps working offline.