What does 30 centimetres look like?

30-Centimetre Distance Comparisons

• For scale, 30 centimetres is about 2.5 times the diameter of a standard compact disc.

  Its published measurement is 12 centimetres; the ratio is calculated from that figure.

  Source: Ecma International

• Measured against the height of a regulation table-tennis table, 30 centimetres spans about 39% of that reference.

  Its published measurement is 76 centimetres; the ratio is calculated from that figure.

  Source: International Table Tennis Federation

• 30 centimetres is about 1.4 times the long side of an A5 sheet.

  Its published measurement is 21 centimetres; the ratio is calculated from that figure.

  Source: International Organization for Standardization

• 30 centimetres is about 2 times the long side of a €200 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 edge of an ISO ID-1 payment card, 30 centimetres spans about 3.5 times that reference.

  Using the source measurement of 8.56 centimetres, this comparison puts the target at 3.5 of it.

  Source: International Organization for Standardization

• For scale, 30 centimetres is about 28% of the height of a tennis net at the posts.

  Using the source measurement of 107 centimetres, this comparison puts the target at 28% of it.

  Source: International Tennis Federation

• For scale, 30 centimetres is about 3.9 times the short side of a €50 note.

  Its published measurement is 7.7 centimetres; the ratio is calculated from that figure.

  Source: European Central Bank

• 30 centimetres is approximately 11.8 inches.

  Using the exact conversion that 1 centimetre equals exactly 0.3937007874 inches, the unrounded result is 11.811 inches.