--- title: "18 in to cm = 45.72 cm" description: "18 inches is 45.72 centimeters. The arithmetic, a table of nearby values, and a converter for any other number." url: https://atoneplace.net/convert/18-inches-to-cm/ site: "At One Place" --- # 18 in to cm **18 inches in centimeters: 18 in = 45.72 cm** cm = in × 2.54 18 inches is 45.72 centimeters. To get there, multiply by 2.54. ## Values either side *Inches near 18, converted to centimeters.* | Inches | Centimeters | | --- | --- | | 14 in | 35.56 | | 15 in | 38.1 | | 16 in | 40.64 | | 17 in | 43.18 | | 18 in ← | 45.72 | | 19 in | 48.26 | | 20 in | 50.8 | | 21 in | 53.34 | | 22 in | 55.88 | ## How the conversion works The relationship is cm = in × 2.54. Both units measure length, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two. ## Common questions ### What is 18 in in centimeters? 18 in is 45.72 cm. ### How do you convert inches to centimeters? Multiply by 2.54. ## Related pages - [Inches to centimeters](https://atoneplace.net/convert/inches-to-cm/) - [18 cm to in](https://atoneplace.net/convert/18-cm-to-inches/) - [14 in to cm](https://atoneplace.net/convert/14-inches-to-cm/) - [15 in to cm](https://atoneplace.net/convert/15-inches-to-cm/) - [16 in to cm](https://atoneplace.net/convert/16-inches-to-cm/) - [17 in to cm](https://atoneplace.net/convert/17-inches-to-cm/) - [19 in to cm](https://atoneplace.net/convert/19-inches-to-cm/) - [20 in to cm](https://atoneplace.net/convert/20-inches-to-cm/) - [21 in to cm](https://atoneplace.net/convert/21-inches-to-cm/) - [22 in to cm](https://atoneplace.net/convert/22-inches-to-cm/) ## Sources - Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)] - The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure) - Calculated on this page — At One Place (/about/)