Micrometers to Inches Converter
Enter the length in micrometers below to convert it to inches.
Convert Micrometers to Inches
Enter a value in micrometers (µm) to convert to inches (in).
Micrometers to Inches Conversion Chart (1–40 Continuous)
Continuous 1 to 40 micrometers lookup table with exact decimals and reduced nearest 1/64 fractions. Highlighted rows mark common shop and ruler values.
| Micrometers (µm) | Decimal (in) | Fraction — Nearest 1/64 (Reduced) | Nearest 1/16 (Tape) |
|---|---|---|---|
1 µm★ Common | 0.000039 in | 0 in | 0 in |
2 µm★ Common | 0.000079 in | 0 in | 0 in |
3 µm★ Common | 0.000118 in | 0 in | 0 in |
4 µm | 0.000157 in | 0 in | 0 in |
5 µm★ Common | 0.000197 in | 0 in | 0 in |
6 µm★ Common | 0.000236 in | 0 in | 0 in |
7 µm | 0.000276 in | 0 in | 0 in |
8 µm★ Common | 0.000315 in | 0 in | 0 in |
9 µm | 0.000354 in | 0 in | 0 in |
10 µm★ Common | 0.000394 in | 0 in | 0 in |
11 µm | 0.000433 in | 0 in | 0 in |
12 µm★ Common | 0.000472 in | 0 in | 0 in |
How to Convert Micrometers to Inches
To convert micrometers to inches, multiply the length by the following conversion ratio: 0.00003937 inches/micrometer.
Since one micrometer is equal to 0.00003937 inches, you can use this simple formula to convert:
The length in inches is equal to the length in micrometers multiplied by 0.00003937.
For example, here's how to convert 254 micrometers to inches using the formula above.
How Many Inches Are in a Micrometer?
There are 0.00003937 inches in a micrometer, which is why we use this value in the formula above.
Our micrometer fraction and decimal calculator can convert micrometers and inches, and it automatically converts the results to US customary, imperial, and SI metric values.
Micrometers and inches are both units used to measure length. Keep reading to learn more about each unit.
How to Convert Micrometers to Fractional Inches (1/16″, 1/32″ & 1/64″)
Plain-language method for turning decimal inches into a standard tape-measure or machinist ruler fraction
Calculators give you a decimal number (such as 0.01 in), but tape measures and woodworking rulers are marked in binary fractions of an inch—most commonly 1/16″ on carpenter tapes, 1/32″ on fine woodworking rules, and 1/64″ on machinist scales.
Here is the step-by-step worked example for converting 254 micrometers (µm) into fractional inches:
- Find the decimal inches result: Convert 254 µm to inches to get 0.01 in.
- Separate the whole inches from the decimal part: Keep the whole number 0 aside, leaving the decimal remainder 0.01.
- Multiply the decimal part by your desired fraction denominator (16, 32, or 64) and round half up: Multiply 0.01 by 16, 32, or 64, then round to the nearest whole number (values ending in .5 round up).
- Reduce the fraction to lowest terms: If the rounded top number (numerator) is even, divide both top and bottom by 2 (or their Greatest Common Divisor) until the top number is odd, then combine with your whole inches.
What Is a Micrometer?
A micrometer is a unit of length equal to 1/1,000,000 of a meter (0.000001 m). One millionth of a meter (10⁻⁶ m), also known as a micron. [1]
The micrometer is classified as a metric and SI-compatible unit of length. Micrometers can be abbreviated as µm; for example, 1 micrometer can be written as 1 µm.
In the metric system, "micro" is the standard SI prefix for millionths, or 10⁻⁶. This makes the micrometer (µm) a convenient decimal multiple of the meter (m).
In practice, micrometers (µm) are widely used across fine-tolerance laboratory, analytical, and micro-scale length measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is an Inch?
An inch is a unit of length equal to 1/12 of a foot or 1/36 of a yard. Because the international yard is legally defined as exactly 0.9144 meters under the 1959 International Yard and Pound Agreement, one inch equals exactly 2.54 centimeters (25.4 millimeters or 25,400,000 nanometers). [2]
The inch is a US customary and imperial unit of length. Inches can be abbreviated as in; for example, 1 inch can be written as 1 in.
Inches can also be denoted using the ″ symbol, otherwise known as a double prime. Often a double quote (") is used instead of a double prime for convenience. A double prime is commonly used to express 1 in as 1″.
The standard ruler is 12 inches long and is a common tool for measuring a length in inches. Another frequently used tool to perform measurements in inches is a tape measure, which commonly comes in lengths from 6' to 35'. Other devices used to measure in inches include scales, calipers, measuring wheels, micrometers, yardsticks, and even lasers.
When converting length between micrometers (µm) and inches (in), keep full floating-point precision (1 µm = 0.00003937 in; 1 in = 25,400 µm) during intermediate calculations and round only the final inch figure to match your instrument tolerance.
More Micrometer & Inch Conversions
Need to calculate in the opposite direction? Use our inches to micrometers converter (in to µm) to switch your starting unit immediately. You can also explore related tools such as converting centimeters to inches, converting millimeters to inches, or converting micrometers to millimeters.
Convert from Micrometers
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Length Metrology Standard — Micrometers (µm) to Inches (in)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Micrometer (Micron) (µm) & Inch (in)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (µm to in)