---
title: "3 cm to mm = 30 mm"
description: "3 centimeters is 30 millimeters. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/3-cm-to-mm/
site: "At One Place"
---

# 3 cm to mm

**3 centimeters in millimeters: 3 cm = 30 mm**

mm = cm × 10

3 centimeters is 30 millimeters. To get there, multiply by 10.

## Values either side

*Centimeters near 3, converted to millimeters.*

| Centimeters | Millimeters |
| --- | --- |
| 1 cm | 10 |
| 1.5 cm | 15 |
| 2 cm | 20 |
| 2.5 cm | 25 |
| 3 cm ← | 30 |
| 4 cm | 40 |
| 5 cm | 50 |
| 6 cm | 60 |
| 7 cm | 70 |

## How the conversion works

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

## Common questions

### What is 3 cm in millimeters?

3 cm is 30 mm.

### How do you convert centimeters to millimeters?

Multiply by 10.

## Related pages

- [Centimeters to millimeters](https://atoneplace.net/convert/cm-to-mm/)
- [3 mm to cm](https://atoneplace.net/convert/3-mm-to-cm/)
- [1 cm to mm](https://atoneplace.net/convert/1-cm-to-mm/)
- [1.5 cm to mm](https://atoneplace.net/convert/1-5-cm-to-mm/)
- [2 cm to mm](https://atoneplace.net/convert/2-cm-to-mm/)
- [2.5 cm to mm](https://atoneplace.net/convert/2-5-cm-to-mm/)
- [4 cm to mm](https://atoneplace.net/convert/4-cm-to-mm/)
- [5 cm to mm](https://atoneplace.net/convert/5-cm-to-mm/)
- [6 cm to mm](https://atoneplace.net/convert/6-cm-to-mm/)
- [7 cm to mm](https://atoneplace.net/convert/7-cm-to-mm/)

## 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/)