inches (in)

inches as a conversion hub: 8 direct pairs, all with the exact factor on the page.

Definition1 in = 0.0254 m exactly

CategoryLength Converter

Pairs from here8

Length Converter

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inches converted to every other unit

in	mm	cm	m	km	ft	yd	mi	nmi
1 in	25.4	2.54	0.0254	0.0000254	0.08333333	0.02777778	0.0000157828	0.0000137149
2 in	50.8	5.08	0.0508	0.0000508	0.16666667	0.05555556	0.0000315657	0.0000274298
5 in	127	12.7	0.127	0.000127	0.41666667	0.13888889	0.0000789141	0.0000685745
10 in	254	25.4	0.254	0.000254	0.83333333	0.27777778	0.0001578283	0.000137149
20 in	508	50.8	0.508	0.000508	1.666667	0.55555556	0.0003156566	0.0002742981
50 in	1,270	127	1.27	0.00127	4.166667	1.388889	0.0007891414	0.0006857451
100 in	2,540	254	2.54	0.00254	8.333333	2.777778	0.0015782828	0.0013714903

All conversions starting from in

in to mm in to cm in to m in to km in to ft in to yd in to mi in to nmi

Questions

How do I convert from inches?

Pick the target unit from the table on this page, or open the dedicated pair page — each one carries a converter, a table of common values and the exact factor.

Is inch exact or approximate?

The factor shown (1 in = 0.0254 m) is fixed by definition, so conversions are exact rather than measured.

What is inch used for?

US and UK length — screens, tools, clothing