What is an inches to micrometers converter?
An inches to micrometers converter is an online tool that translates a length given in inches (in) into its equivalent in micrometers (μm), and back again. The inch belongs to the imperial system still common in the United States, while the micrometer (also called a micron) is a metric unit equal to one millionth of a meter. Because a single inch contains tens of thousands of micrometers, this converter is especially handy whenever a coarse, everyday measurement needs to be expressed at a microscopic scale, such as in machining tolerances, coating thicknesses, or material specifications.
How it works
The conversion rests on two fixed definitions. One inch equals exactly 25.4 millimeters, and one millimeter equals 1,000 micrometers. Multiplying those two facts together shows that one inch equals exactly 25,400 micrometers. To go the other direction, you divide the number of micrometers by 25,400.
The tool is bidirectional: type a value in the inches field and the micrometers field updates, or type micrometers and the inches field responds. Both fields also let you switch the active unit, so you can enter feet or yards on the inches side and still read the result in micrometers.
Formula
To convert inches to micrometers, multiply by 25,400:
To convert micrometers back to inches, divide by 25,400:
Inches to micrometers conversion table
The table below lists common inch values and their exact micrometer equivalents.
| Inches (in) | Micrometers (μm) |
|---|---|
| 0.5 | 12,700 |
| 1 | 25,400 |
| 2 | 50,800 |
| 3 | 76,200 |
| 5 | 127,000 |
| 10 | 254,000 |
| 12 (1 ft) | 304,800 |
| 36 (1 yd) | 914,400 |
| 100 | 2,540,000 |
Examples
Example 1: One inch to micrometers
Convert a single inch to micrometers using the factor of 25,400:
So 1 inch equals 25,400 micrometers.
Example 2: Two inches to micrometers
A part measured at 2 inches converts as follows:
That gives 50,800 micrometers.
Example 3: One foot to micrometers
Because 1 foot equals 12 inches, you can switch the inches field to feet and convert 1 ft directly:
One foot therefore equals 304,800 micrometers.
Example 4: Micrometers back to inches
Going the other way, 25,400 micrometers returns to its starting point:
which confirms that 25,400 micrometers is exactly 1 inch.
Notes
- The relationship between inches and micrometers is exact, because the inch is defined as precisely 25.4 millimeters. No rounding is introduced by the conversion factor itself.
- A micrometer is sometimes written as a micron and shares the same symbol, μm. Do not confuse the unit micrometer with the measuring instrument also called a micrometer.
- Micrometers are typical for very small dimensions such as the diameter of a human hair (around 70 μm) or a thin film coating, so inch values usually produce large micrometer numbers.
Frequently asked questions
How many micrometers are in one inch?
There are exactly 25,400 micrometers in one inch, since one inch equals 25.4 millimeters and each millimeter contains 1,000 micrometers.
How do I convert micrometers to inches?
Divide the number of micrometers by 25,400. For example, 25,400 μm divided by 25,400 equals 1 inch.
Is a micrometer the same as a micron?
Yes. The micron is an older name for the micrometer, and both refer to one millionth of a meter, written with the symbol μm.
How many micrometers are in a foot?
One foot equals 12 inches, so it equals 304,800 micrometers (12 × 25,400).
Can I convert feet or yards with this tool?
Yes. The inches field lets you switch the active unit to feet, yards, or miles before entering a value, and the result is still shown in micrometers. To work with centimeters instead, use our inches to centimeters converter.
Why are the micrometer results so large?
The micrometer is a tiny unit, one millionth of a meter, so even a modest length in inches translates into tens of thousands of micrometers or more.