Millimeters to inches

inches = millimeters × 0.03937008

Ad · pair-top

How to convert millimeters to inches

One millimeter is 0.03937008 inches, so multiply the number of millimeters by 0.03937008. For example, 20 millimeters is 20 × 0.03937008 = 0.78740157 inches. To go back, divide by the same number, or multiply by 25.4.

Quick estimate

Multiplying by about 0.04 gets within 1.6% of the exact answer, which is enough to check that a result makes sense.

Where it comes up

Length conversions come up in DIY and building plans, running and cycling distances, maps, clothing sizes and travel between countries that use metric and imperial units.

millimeters	inches
1 mm	0.03937008 in
2 mm	0.07874016 in
3 mm	0.11811024 in
4 mm	0.15748031 in
5 mm	0.19685039 in
6 mm	0.23622047 in
7 mm	0.27559055 in
8 mm	0.31496063 in
9 mm	0.35433071 in
10 mm	0.39370079 in
11 mm	0.43307087 in
12 mm	0.47244094 in
13 mm	0.51181102 in
14 mm	0.5511811 in
15 mm	0.59055118 in
16 mm	0.62992126 in
17 mm	0.66929134 in
18 mm	0.70866142 in
19 mm	0.7480315 in
20 mm	0.78740157 in
25 mm	0.98425197 in
30 mm	1.181102 in
40 mm	1.574803 in
50 mm	1.968504 in
60 mm	2.362205 in
70 mm	2.755906 in
75 mm	2.952756 in
80 mm	3.149606 in
90 mm	3.543307 in
100 mm	3.937008 in
120 mm	4.724409 in
150 mm	5.905512 in
200 mm	7.874016 in
250 mm	9.84252 in
300 mm	11.811024 in
400 mm	15.748031 in
500 mm	19.685039 in
750 mm	29.527559 in
1,000 mm	39.370079 in
1,500 mm	59.055118 in
2,000 mm	78.740157 in
5,000 mm	196.850394 in
10,000 mm	393.700787 in

Questions

How many inches are in a millimeter?

0.03937008 inches.

How do I convert millimeters to inches in a spreadsheet?

Put the value in A1 and type =A1*0.03937008, then fill the formula down the column.

Are the values in the table exact?

They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.