Inch (in) Converter Hub

Length · all in conversions · Updated 2026-10-04

The inch (in) is one of the units in the length family. Rather than jump between 7 separate converter pages, this hub gathers every in conversion in one place: the table below gives the factor for each partner unit in both directions, so you can see at a glance whether a value will come out larger or smaller.

The numbers are exact to seven significant figures, which is more precision than most day-to-day work needs but matters when a factor is applied repeatedly in a spreadsheet or a batch calculation. As a quick sense of scale: 1000 in = 25400 mm, and 1000 in = 2540 cm.

Every row links to a dedicated converter with a worked example, a full value table and the reverse page, so you can go straight from this overview to the specific conversion you need.

All in conversions

Convert from in	Factor	Convert to in
in to mm	25.4 mm	mm to in
in to cm	2.54 cm	cm to in
in to m	0.0254 m	m to in
in to km	2.5400e-5 km	km to in
in to ft	0.08333333 ft	ft to in
in to yd	0.02777778 yd	yd to in
in to mi	1.5783e-5 mi	mi to in

Popular in conversions

Cm → In

Frequently asked questions

How many units can the in be converted to?
7 partner units in the Length family: mm, cm, m, km, ft, yd, mi.

What is the in conversion factor?
Inch: 1 in = 25.4 mm; 1 in = 2.54 cm; 1 in = 0.0254 m, and so on for every other partner unit.

Back to the Length conversions hub, the ConvBolt Unit Converter, or browse our conversion guides.