---
title: "1 in to cm = 2.54 cm"
description: "1 inch is 2.54 centimeters. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/1-inches-to-cm/
site: "At One Place"
---

# 1 in to cm

**1 inch in centimeters: 1 in = 2.54 cm**

cm = in × 2.54

1 inch is 2.54 centimeters. To get there, multiply by 2.54.

## Values either side

*Inches near 1, converted to centimeters.*

| Inches | Centimeters |
| --- | --- |
| 0.5 in | 1.27 |
| 1 in ← | 2.54 |
| 1.5 in | 3.81 |
| 2 in | 5.08 |
| 2.5 in | 6.35 |
| 3 in | 7.62 |

## 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 1 in in centimeters?

1 in is 2.54 cm.

### How do you convert inches to centimeters?

Multiply by 2.54.

## Related pages

- [Inches to centimeters](https://atoneplace.net/convert/inches-to-cm/)
- [1 cm to in](https://atoneplace.net/convert/1-cm-to-inches/)
- [0.5 in to cm](https://atoneplace.net/convert/0-5-inches-to-cm/)
- [1.5 in to cm](https://atoneplace.net/convert/1-5-inches-to-cm/)
- [2 in to cm](https://atoneplace.net/convert/2-inches-to-cm/)
- [2.5 in to cm](https://atoneplace.net/convert/2-5-inches-to-cm/)
- [3 in to cm](https://atoneplace.net/convert/3-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/)