---
title: "Millimeters to Micrometers — mm to µm converter"
description: "1 millimeter = 1,000 micrometers. Convert millimeters to micrometers with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/mm-to-microns/
site: "At One Place"
---

# Millimeters to micrometers

**1 millimeter in micrometers: 1 mm = 1,000 µm**

µm = mm × 1,000

To convert millimeters to micrometers, multiply by 1,000. The table below gives the values people look up most often, and the converter works for any number.

## Millimeters to micrometers table

*Common millimeter values converted to micrometers.*

| Millimeters | Micrometers |
| --- | --- |
| 1 mm | 1,000 |
| 2 mm | 2,000 |
| 3 mm | 3,000 |
| 4 mm | 4,000 |
| 5 mm | 5,000 |
| 10 mm | 10,000 |
| 15 mm | 15,000 |
| 20 mm | 20,000 |
| 25 mm | 25,000 |
| 30 mm | 30,000 |
| 40 mm | 40,000 |
| 50 mm | 50,000 |
| 75 mm | 75,000 |
| 100 mm | 100,000 |
| 250 mm | 250,000 |
| 500 mm | 500,000 |
| 1,000 mm | 1,000,000 |

## How the conversion works

The relationship is µm = mm × 1,000. Both units measure length, so the conversion is a fixed factor that never changes.

## Common questions

### How many micrometers are in one millimeter?

One millimeter equals 1,000 micrometers. µm = mm × 1,000.

### How do you convert millimeters to micrometers?

Use µm = mm × 1,000. So 10 mm is 10,000 µm.

### How many millimeters are in one micrometer?

One micrometer equals 0.001 millimeters, which is the reverse of the conversion above.

## Related pages

- [Micrometers to Millimeters](https://atoneplace.net/convert/microns-to-mm/)
- [Millimeters to Meters](https://atoneplace.net/convert/mm-to-meters/)
- [Millimeters to Kilometers](https://atoneplace.net/convert/mm-to-km/)
- [Millimeters to Centimeters](https://atoneplace.net/convert/mm-to-cm/)
- [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/)