Length

in to m conversion

Convert inch (in) to metre (m). Length units span pipe diameters (mm, inch), plant dimensions (m, ft), and roughness (µm) — mixing metric and imperial is routine.

1 in = 0.0254 m

Formula

To convert inch to metre, multiply the in value by 0.0254. To go the other way, divide by 0.0254 (or multiply by 39.37008).

in to m conversion table

in	m
1	0.0254
2	0.0508
5	0.127
10	0.254
25	0.635
50	1.27
100	2.54
250	6.35
500	12.7
1000	25.4

Used in practice

Pipe sizes are labelled in inches (NPS) but calculated in mm; equipment layouts mix metres and feet.

Velocity scales with the inverse square of diameter, so a small length error compounds quickly in flow calculations.

Worked example. A length of 3.937008 in is 0.1 m.

Frequently asked questions

How do you convert inch to metre?

Multiply the value in in by 0.0254 to get m. For example, 10 in = 0.254 m.

What is 1 in in m?

1 in equals 0.0254 m.

Where is this conversion used?