This converter turns mils into nanometers instantly, using the exact factor 1 mil = 25400 nanometers. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
One thousandth of an inch, the standard thickness unit for plastic film and PCB traces. One billionth of a metre — the scale of light wavelengths and chip lithography.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
mils- The amount you are converting, measured in mils
25400- The exact number of nanometers in one mil
nanometers- The converted result
How it works, step by step
- Enter the number of mils you want to convert.
- The value is multiplied by 25400, the exact conversion factor.
- The result is displayed in nanometers, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 mils
Multiply 5 by 25400. That gives 127,000 nanometers. A quick sanity check: one mil is larger than one nanometer, so the number should get bigger — and it does.
Converting 72 mils
72 × 25400 = 1,828,800 nanometers. Working backwards, 1,828,800 ÷ 25400 returns 72 mils, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many nanometers are in one mil?
Exactly 25400. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert mils to nanometers?
Nanometers = mils × 25400. To reverse it, divide instead: mils = nanometers ÷ 25400, which is the same as multiplying by 3.937007874e-05.
Is the mil bigger than the nanometer?
Yes. One mil equals 25400 nanometers, so it is the larger unit.
Why does my answer differ slightly from other mils to nanometers converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a mil?
One thousandth of an inch, the standard thickness unit for plastic film and PCB traces.
What is a nanometer?
One billionth of a metre — the scale of light wavelengths and chip lithography.
Mils to nanometers reference table
| Mils | Nanometers |
|---|---|
| 0.5 mil | 12,700 nm |
| 1 mil | 25,400 nm |
| 2 mil | 50,800 nm |
| 3 mil | 76,200 nm |
| 5 mil | 127,000 nm |
| 10 mil | 254,000 nm |
| 15 mil | 381,000 nm |
| 20 mil | 508,000 nm |
| 25 mil | 635,000 nm |
| 50 mil | 1,270,000 nm |
| 75 mil | 1,905,000 nm |
| 100 mil | 2,540,000 nm |
| 250 mil | 6,350,000 nm |
| 500 mil | 12,700,000 nm |
| 1000 mil | 25,400,000 nm |
Exact factor: 1 mil = 25400 nanometers. Values rounded for display.