---
title: "Millimeters to Centimeters — mm to cm converter"
description: "1 millimeter = 0.1 centimeters. Convert millimeters to centimeters with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/mm-to-cm/
site: "At One Place"
---

# Millimeters to centimeters

**1 millimeter in centimeters: 1 mm = 0.1 cm**

cm = mm × 1/10

To convert millimeters to centimeters, multiply by 0.1. The table below gives the values people look up most often, and the converter works for any number.

## Millimeters to centimeters table

*Common millimeter values converted to centimeters.*

| Millimeters | Centimeters |
| --- | --- |
| 1 mm | 0.1 |
| 2 mm | 0.2 |
| 3 mm | 0.3 |
| 4 mm | 0.4 |
| 5 mm | 0.5 |
| 10 mm | 1 |
| 15 mm | 1.5 |
| 20 mm | 2 |
| 25 mm | 2.5 |
| 30 mm | 3 |
| 40 mm | 4 |
| 50 mm | 5 |
| 75 mm | 7.5 |
| 100 mm | 10 |
| 250 mm | 25 |
| 500 mm | 50 |
| 1,000 mm | 100 |

## How the conversion works

The relationship is cm = mm × 1/10. Both units measure length, so the conversion is a fixed factor that never changes.

## Common questions

### How many centimeters are in one millimeter?

One millimeter equals 0.1 centimeters. cm = mm × 1/10.

### How do you convert millimeters to centimeters?

Use cm = mm × 1/10. So 10 mm is 1 cm.

### How many millimeters are in one centimeter?

One centimeter equals 10 millimeters, which is the reverse of the conversion above.

## Related pages

- [Centimeters to Millimeters](https://atoneplace.net/convert/cm-to-mm/)
- [Millimeters to Meters](https://atoneplace.net/convert/mm-to-meters/)
- [Millimeters to Kilometers](https://atoneplace.net/convert/mm-to-km/)
- [Millimeters to Miles](https://atoneplace.net/convert/mm-to-miles/)
- [Millimeters to Yards](https://atoneplace.net/convert/mm-to-yards/)
- [Millimeters to Feet](https://atoneplace.net/convert/mm-to-feet/)
- [Millimeters to Inches](https://atoneplace.net/convert/mm-to-inches/)

## 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/)