Convert 18 CM to Inches | Visual Length Comparison

Exact conversion

cm

18

mm

180

m

0.18

″

7.0866

Fractional inches

7 1/8″

Feet and inches

0′ 7 1/8″

Measured comparisons

• The short side of A4 paper: 18 cm is 14.3% shorter; the ratio is 0.857:1. ^[1]
• A standard CD-ROM's nominal diameter: 18 cm is 50% longer; the ratio is 1.5:1. ^[2]
• Width of a 2020 MacBook Air: 18 cm is 40.8% shorter; the ratio is 0.592:1. ^[3]

Interesting Trivia About 18 Centimeters

• 💡The total length including the horn of Male Hercules beetles is about 19 cm; 18 cm is only about 1 cm shorter.
• 💡The body length of Titan beetles is about 16.7 cm; 18 cm is only about 1.3 cm longer.

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Questions about this value

Method and sources

All values are calculated from the published dimensions linked below. 1 inch equals 25.4 mm exactly.

Sources

1. [1]ISO 216:2007 — Writing paper and certain classes of printed matter
2. [2]ECMA-130 — Data interchange on read-only 120 mm optical data disks
3. [3]MacBook Air (M1, 2020) — Technical Specifications