---
title: "Inches to Micrometers — in to µm converter"
description: "1 inch = 25,400 micrometers. Convert inches to micrometers with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/inches-to-microns/
site: "At One Place"
---

# Inches to micrometers

**1 inch in micrometers: 1 in = 25,400 µm**

µm = in × 25,400

To convert inches to micrometers, multiply by 25,400. The table below gives the values people look up most often, and the converter works for any number.

## Inches to micrometers table

*Common inch values converted to micrometers.*

| Inches | Micrometers |
| --- | --- |
| 1 in | 25,400 |
| 2 in | 50,800 |
| 3 in | 76,200 |
| 4 in | 101,600 |
| 5 in | 127,000 |
| 10 in | 254,000 |
| 15 in | 381,000 |
| 20 in | 508,000 |
| 25 in | 635,000 |
| 30 in | 762,000 |
| 40 in | 1,016,000 |
| 50 in | 1,270,000 |
| 75 in | 1,905,000 |
| 100 in | 2,540,000 |
| 250 in | 6,350,000 |
| 500 in | 12,700,000 |
| 1,000 in | 25,400,000 |

## How the conversion works

The relationship is µm = in × 25,400. 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

### How many micrometers are in one inch?

One inch equals 25,400 micrometers. µm = in × 25,400.

### How do you convert inches to micrometers?

Use µm = in × 25,400. So 10 in is 254,000 µm.

### How many inches are in one micrometer?

One micrometer equals 0.00003937 inches, which is the reverse of the conversion above.

## Related pages

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

## 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/)