Length

in to cm conversion

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

1 in = 2.54 cm

Formula

To convert inch to centimetre, multiply the in value by 2.54. To go the other way, divide by 2.54 (or multiply by 0.3937008).

in to cm conversion table

in	cm
1	2.54
2	5.08
5	12.7
10	25.4
25	63.5
50	127
100	254
250	635
500	1270
1000	2540

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 10 cm.

Frequently asked questions

How do you convert inch to centimetre?

Multiply the value in in by 2.54 to get cm. For example, 10 in = 25.4 cm.

What is 1 in in cm?

1 in equals 2.54 cm.

Where is this conversion used?