Millimeter to Inch Converter

Type a value — the answer appears instantly. 1 mm = 0.0393701 in.

Reviewed by the OmniCalc teamMethod verified 2026-07-01

From (millimeters)

To (inches)

Result

0.0393701 inches

= 0.001 m= 0.00328084 ft

Formula: in = mm × 0.039370079

Millimeter to Inch formula

in = mm × 0.039370079

Convert 5 millimeters to inches

Start with 5 millimeters.
Multiply by the conversion factor: 5 × 0.0393701 = 0.19685.
So 5 mm = 0.19685 in.

Millimeter to Inch conversion table

Millimeter to Inch conversion table
Millimeters (mm)	Inches (in)
0.01 mm	0.000393701 in
0.1 mm	0.00393701 in
0.25 mm	0.00984252 in
0.5 mm	0.019685 in
1 mm	0.0393701 in
2 mm	0.0787402 in
3 mm	0.11811 in
4 mm	0.15748 in
5 mm	0.19685 in
6 mm	0.23622 in
7 mm	0.275591 in
8 mm	0.314961 in
9 mm	0.354331 in
10 mm	0.393701 in
15 mm	0.590551 in
20 mm	0.787402 in
25 mm	0.984252 in
30 mm	1.1811 in
40 mm	1.5748 in
50 mm	1.9685 in
75 mm	2.95276 in
100 mm	3.93701 in
250 mm	9.84252 in
500 mm	19.685 in
1,000 mm	39.3701 in
5,000 mm	196.85 in
10,000 mm	393.701 in

Unit definitions

What is a millimeter?

The millimetre is one thousandth of a metre, an SI unit of length. It is the finest gradation on most metric rulers and is standard for engineering drawings, machining tolerances, and rainfall measurement. Ten millimetres make one centimetre.

What is a inch?

The inch is an imperial and US customary length unit defined as exactly 0.0254 metres since 1959. It is widely used in the United States and for screen sizes, pipe diameters, and lumber. Twelve inches make one foot.

Frequently asked questions

How many inches are in one millimeter?

One millimeter equals 0.0393701 inches (1 mm = 0.0393701 in).

How do I convert millimeters to inches?

Multiply the value in millimeters by 0.0393701. For example, 10 mm × 0.0393701 = 0.393701 in.

Which is bigger — a millimeter or a inch?

A inch is bigger: one inch contains 25.4 millimeters.

Is this millimeter to inch converter free?

Yes — the converter is free, works offline once loaded, and computes instantly in your browser without sending your numbers to a server.

Conversion factors follow international definitions (SI / NIST). Last verified 2026-07-01.