How Long Is 18 centimetres? Distance Comparisons

How long is 18 centimetres?

Rather than leaving 18 centimetres as an abstract number, these examples translate it into familiar scale.

18-Centimetre Distance Comparisons

For scale, 18 centimetres is about 1.2 times the short side of an A5 sheet.
Its published measurement is 14.8 centimetres; the ratio is calculated from that figure.
Source: International Organization for Standardization
18 centimetres is about 2.6 times the maximum diameter of a tennis ball.
The comparison uses the published dimension, converted into the same unit before the proportion is calculated.
Source: International Tennis Federation
18 centimetres is about 2.1 times the long edge of an ISO ID-1 payment card.
The comparison uses the published dimension, converted into the same unit before the proportion is calculated.
Source: International Organization for Standardization
For scale, 18 centimetres is about 2.9 times the short side of a €5 note.
Its published measurement is 6.2 centimetres; the ratio is calculated from that figure.
Source: European Central Bank
18 centimetres is about 1.4 times the long side of a €20 note.
The comparison uses the published dimension, converted into the same unit before the proportion is calculated.
Source: European Central Bank
Measured against the long side of a €10 note, 18 centimetres spans about 1.4 times that reference.
Using the source measurement of 12.7 centimetres, this comparison puts the target at 1.4 of it.
Source: European Central Bank
For scale, 18 centimetres is about 1.5 times the diameter of a standard compact disc.
Its published measurement is 12 centimetres; the ratio is calculated from that figure.
Source: Ecma International
18 centimetres is approximately 7.1 inches.
Using the exact conversion that 1 centimetre equals exactly 0.3937007874 inches, the unrounded result is 7.087 inches.

Reference measurements are rounded where appropriate, and naturally variable objects are described as approximate, typical, or maximum sizes.