Mils to Nanometers Converter
Enter the length in mils below to convert it to nanometers.
Convert Mils to Nanometers
Enter a value in mils (mil) to convert to nanometers (nm).
Mils to Nanometers Conversion Chart (1–40 Continuous)
Continuous 1 to 40 mils lookup table with exact decimals and reduced nearest 1/64 fractions. Highlighted rows mark common shop and ruler values.
| Mils (mil) | Decimal (nm) | Fraction — Nearest 1/64 (Reduced) | Nearest 1/16 (Tape) |
|---|---|---|---|
1 mil★ Common | 25,400 nm | 25400 nm | 25400 nm |
2 mil★ Common | 50,800 nm | 50800 nm | 50800 nm |
3 mil★ Common | 76,200 nm | 76200 nm | 76200 nm |
4 mil | 101,600 nm | 101600 nm | 101600 nm |
5 mil★ Common | 127,000 nm | 127000 nm | 127000 nm |
6 mil★ Common | 152,400 nm | 152400 nm | 152400 nm |
7 mil | 177,800 nm | 177800 nm | 177800 nm |
8 mil★ Common | 203,200 nm | 203200 nm | 203200 nm |
9 mil | 228,600 nm | 228600 nm | 228600 nm |
10 mil★ Common | 254,000 nm | 254000 nm | 254000 nm |
11 mil | 279,400 nm | 279400 nm | 279400 nm |
12 mil★ Common | 304,800 nm | 304800 nm | 304800 nm |
How to Convert Mils to Nanometers
To convert mils to nanometers, multiply the length by the following conversion ratio: 25,400 nanometers/mil.
Since one mil is equal to 25,400 nanometers, you can use this simple formula to convert:
The length in nanometers is equal to the length in mils multiplied by 25,400.
For example, here's how to convert 5 mils to nanometers using the formula above.
How Many Nanometers Are in a Mil?
There are 25,400 nanometers in a mil, which is why we use this value in the formula above.
Our mil fraction and decimal calculator can convert mils and nanometers, and it automatically converts the results to US customary, imperial, and SI metric values.
Mils and nanometers are both units used to measure length. Keep reading to learn more about each unit.
How to Convert Mils 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 0.005 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 5 mils (mil) into fractional inches:
- Find the decimal inches result: Convert 5 mil to inches to get 0.005 in.
- Separate the whole inches from the decimal part: Keep the whole number 0 aside, leaving the decimal remainder 0.005.
- Multiply the decimal part by your desired fraction denominator (16, 32, or 64) and round half up: Multiply 0.005 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 Mil?
A mil is a unit of length equal to 0.0000254 meters (m), the base unit for length. One thousandth of an inch (0.001 in = 0.0254 mm), used in manufacturing tolerances and film thickness. [1]
The mil is classified as a US customary and imperial unit of length. Mils can be abbreviated as mil; for example, 1 mil can be written as 1 mil.
When working with mils (mil) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, mils (mil) are widely used across fine-tolerance laboratory, analytical, and micro-scale length measurements within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Nanometer?
One nanometer is equal to one-billionth (1/1,000,000,000) of a meter, which is defined as the distance light travels in a vacuum in a 1/299,792,458 second time interval. [2]
The nanometer, or nanometre, is a multiple of the meter, the SI base unit for length. In the metric system, "nano" is the prefix for billionths, or 10⁻⁹. Nanometers can be abbreviated as nm; for example, 1 nanometer can be written as 1 nm.
Because 1 inch equals 25.4 millimeters and 1 millimeter equals 1,000,000 nanometers, there are exactly 25,400,000 nanometers in 1 inch (and 10 Angstroms in 1 nanometer).
The nanometer is an extremely small unit of length measurement, often used to measure things that are very small, such as the wavelengths of visible light (400 nm to 700 nm), the transistors and electrical pathways in computer processors, and thin-film nanotechnology.
When converting length between mils (mil) and nanometers (nm), keep full floating-point precision (1 mil = 25,400 nm; 1 nm = 0.00003937 mil) during intermediate calculations and round only the final nanometer figure to match your instrument tolerance.
More Mil & Nanometer Conversions
Need to calculate in the opposite direction? Use our nanometers to mils calculator to switch your starting unit immediately. You can also explore related tools such as converting nanometers to mils, converting inches to nanometers, or converting meters to nanometers.
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Length Metrology Standard — Mils (mil) to Nanometers (nm)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Mil (Thou) (mil) & Nanometer (nm)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (mil to nm)