---
title: "1 mm to km = 0.000001 km"
description: "1 millimeter is 0.000001 kilometers. The arithmetic, a table of nearby values, and a converter for any other number."
url: https://atoneplace.net/convert/1-mm-to-km/
site: "At One Place"
---

# 1 mm to km

**1 millimeter in kilometers: 1 mm = 0.000001 km**

km = mm × 0.000001

1 millimeter is 0.000001 kilometers. To get there, multiply by 0.000001.

## Values either side

*Millimeters near 1, converted to kilometers.*

| Millimeters | Kilometers |
| --- | --- |
| 0.5 mm | 5 × 10^-7 |
| 1 mm ← | 0.000001 |
| 1.5 mm | 0.0000015 |
| 2 mm | 0.000002 |
| 2.5 mm | 0.0000025 |
| 3 mm | 0.000003 |

## How the conversion works

The relationship is km = mm × 0.000001. Both units measure length, so the conversion is a fixed factor that never changes.

## Common questions

### What is 1 mm in kilometers?

1 mm is 0.000001 km.

### How do you convert millimeters to kilometers?

Multiply by 0.000001.

## Related pages

- [Millimeters to kilometers](https://atoneplace.net/convert/mm-to-km/)
- [1 km to mm](https://atoneplace.net/convert/1-km-to-mm/)
- [0.5 mm to km](https://atoneplace.net/convert/0-5-mm-to-km/)
- [1.5 mm to km](https://atoneplace.net/convert/1-5-mm-to-km/)
- [2 mm to km](https://atoneplace.net/convert/2-mm-to-km/)
- [2.5 mm to km](https://atoneplace.net/convert/2-5-mm-to-km/)
- [3 mm to km](https://atoneplace.net/convert/3-mm-to-km/)

## 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/)