Inches to Decimeters (in to dm) Converter

How to convert inches to decimeters

Formuladm = in × 0.254

Multiply the value in inches by 0.254. To go the other way, multiply by 3.937007874 (or divide by 0.254).

An inch is smaller than a decimeter: it takes 3.937007874 inches to make one decimeter.

Worked examples

1 inch1 in × 0.254 = 0.254 dm
5 inches5 in × 0.254 = 1.27 dm
10 inches10 in × 0.254 = 2.54 dm
20 inches20 in × 0.254 = 5.08 dm
100 inches100 in × 0.254 = 25.4 dm

Inches to decimeters conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Inches to decimeters: 0.1–10 in
Inches (in)	Decimeters (dm)
0.1 in	0.0254 dm
0.25 in	0.0635 dm
0.5 in	0.127 dm
1 in	0.254 dm
2 in	0.508 dm
3 in	0.762 dm
4 in	1.016 dm
5 in	1.27 dm
6 in	1.524 dm
7 in	1.778 dm
8 in	2.032 dm
9 in	2.286 dm
10 in	2.54 dm

Inches to decimeters: 12–1,000 in
Inches (in)	Decimeters (dm)
12 in	3.048 dm
15 in	3.81 dm
20 in	5.08 dm
25 in	6.35 dm
30 in	7.62 dm
40 in	10.16 dm
50 in	12.7 dm
75 in	19.05 dm
100 in	25.4 dm
250 in	63.5 dm
500 in	127 dm
1,000 in	254 dm

About the units

Inch (in)

A US customary and imperial unit defined as exactly 25.4 mm since 1959. Twelve inches make a foot. Screen sizes, tire diameters and lumber dimensions are usually given in inches. One inch equals 0.0254 meters (m).

Decimeter (dm)

The decimeter (dm) is a unit of length in the International System of Units (SI). One decimeter equals 0.1 meters (m).

Frequently asked questions

How many decimeters are in one inch?

There are 0.254 decimeters in one inch, and this value is exact by definition.

How do I convert inches to decimeters?

Multiply the number of inches by 0.254. For example, 10 in × 0.254 = 2.54 dm.

How many inches are in one decimeter?

One decimeter equals 3.937007874 inches. That is the reverse factor, 1 ÷ 0.254.

What is 10 inches in decimeters?

10 in = 2.54 dm.

Is this in to dm converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.

Inches to Decimeters Converter