Units made clear

Inch vs centimetre

What are they, and what does the difference actually look like?

Two things. One honest scale.

Meet the pair

What these two things are

1 inch

The quantity is exact as entered.

2.54 cmLength

1 centimetre

The quantity is exact as entered.

1 cmLength

1 inch has about 2.54 times the length of 1 centimetre.

True scale
01
1 inch2.54 cmLength
02
1 centimetre1 cmLength
Both marked spans share one linear scale. Artwork keeps its proportions; poses and surface detail are illustrative.
Measurements, assumptions & sources +

1 inch

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

NIST — SI conversion factors

1 centimetre

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

NIST — SI conversion factors

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Measurement details

Why these numbers?

The visual compares length with length. The records below preserve each value’s basis and caveats.

1 inch

2.54 cm

Length · definition

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

1 centimetre

1 cm

Length · definition

The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.

Comparing
Length ↔ Length
Relative size
1 inch is larger on this measurement by a factor of about 2.54. 1 inch's selected measurement is approximately 154% greater than 1 centimetre's.

How to read the visual

The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.

One international inch is exactly 2.54 centimetres.

There’s always another scale

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