Convert Nanometers to Thou
1 nanometer is 0.00003937 thou. One nanometer is exactly 0.0000393700787402 thou.
One nanometer is 3.9370 × 10^-5 thou. To convert nanometers to thou, multiply by 3.9370 × 10^-5; to go the other way, divide by 3.9370 × 10^-5 or multiply by 25400. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST. A billionth of a meter.
Factor checked against the defining standard · How we check
- Nanometers × 3.9370 × 10^-5
1 * 0.00003940 thou
1 nanometer in every length unit
| Unit | Value | Exact factor |
|---|---|---|
| inches | 0.00000003937007874 in | × 0.0000000393700787402 |
| feet | 0.000000003280839895 ft | × 0.00000000328083989501 |
| yards | 0.000000001093613298 yd | × 0.00000000109361329834 |
| miles | 0 mi | × 0.000000000000621371192237 |
| millimeters | 0.000001 mm | × 0.000001 |
| decimetres | 0.00000001 dm | × 0.00000001 |
| centimeters | 0.0000001 cm | × 0.0000001 |
| meters | 0.000000001 m | × 0.000000001 |
| kilometers | 0.000000000001 km | × 0.000000000001 |
| nautical miles | 0 nmi | × 0.000000000000539956803456 |
| micrometers | 0.001 µm | × 0.001 |
| nanometers (as entered) | 1 nm | — |
| thou | 0.00003937007874 thou | × 0.0000393700787402 |
Factors are entered by hand from NIST rather than derived from a units library, so the ones that terminate are exact rather than rounded.
The same converter answers this pair however it is written: nanometres to thou is the British spelling of the same units — the metre and the litre are spelled that way outside the United States and the quantity does not change.
How do you convert nanometers to thou? The converter and the working
- 1.Take the measurement in nanometers.
- 2.Multiply by 3.9370 × 10^-5 — that is how many thou fit in one nanometer.
- 3.To go back the other way, divide by 3.9370 × 10^-5, or multiply by 25400.
Worked example: 25 nanometers to thou
- Formula
- nm × 3.9370 × 10^-5 = thou
- Arithmetic
- 25 × 3.9370 × 10^-5 = 0.0009843 thou
- Answer
- 25 nm = 0.0009843 thou
The factor is rounded for display; the figure above is computed from the full value.
Nanometers to thou conversion table
| Nanometers | Thou |
|---|---|
| 1 nm | 0.00003937 thou |
| 2 nm | 0.00007874 thou |
| 3 nm | 0.0001181 thou |
| 4 nm | 0.0001575 thou |
| 5 nm | 0.0001969 thou |
| 6 nm | 0.0002362 thou |
| 7 nm | 0.0002756 thou |
| 8 nm | 0.000315 thou |
| 9 nm | 0.0003543 thou |
| 10 nm | 0.0003937 thou |
| 12 nm | 0.0004724 thou |
| 15 nm | 0.0005906 thou |
| 20 nm | 0.0007874 thou |
| 25 nm | 0.0009843 thou |
| 50 nm | 0.001969 thou |
| 100 nm | 0.003937 thou |
| 200 nm | 0.01 thou |
| 300 nm | 0.01 thou |
| 500 nm | 0.02 thou |
| 1000 nm | 0.04 thou |
| 2000 nm | 0.08 thou |
| 5000 nm | 0.2 thou |
| 10000 nm | 0.39 thou |
What is a nanometer?
A billionth of a meter. Visible light runs from about 380 to 750 nm, and a semiconductor process node is named after one even though it stopped describing a physical dimension years ago.
What is a thou?
A thousandth of an inch, exactly 25.4 micrometers, and called a mil in American workshops — the same word the metric world uses for a millimeter, which is why a drawing marked "5 mil" is worth checking twice.
How many thou are in a nanometer?
One nanometer is 3.9370 × 10^-5 thou. Going the other way, one thou is 25400 nanometers. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every length unit here
The whole group — 13 units with their symbols and the size of each one in meters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a nanometer.
Source: NIST — international yard and pound agreement (inch = 25.4 mm exactly)
Cite this page
- APA
- Rule Calculator. (2026). Convert Nanometers to thou. Rule Calculator. https://rulecalculators.com/convert/nanometer-to-thou
- MLA
- "Convert Nanometers to thou." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/nanometer-to-thou.
- Chicago
- Rule Calculator. "Convert Nanometers to thou." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/nanometer-to-thou.
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Questions people actually ask
- How many thou are in a nanometer?
- 3.9370 × 10^-5. A thousandth of an inch, exactly 25.4 micrometers, and called a mil in American workshops — the same word the metric world uses for a millimeter, which is why a drawing marked "5 mil" is worth checking twice.
- How do I convert thou back to nanometers?
- Divide by 3.9370 × 10^-5, or multiply by 25400 — they are the same operation.
Other length conversions
Thou to nanometers — the same conversion the other way.