What is nanometre?
A nanometre is a unit of length equal to one billionth of a metre. It is used to measure wavelengths of visible light, atomic radii, and dimensions of nanostructures in materials science.
Real-world uses
Nanometres are the standard unit in semiconductor fabrication (e.g., 5 nm chip processes), wavelength of visible light (380–700 nm), and molecular biology for measuring DNA strand widths and protein structures.
History
The nanometre gained prominence in the late 20th century with advances in electron microscopy and semiconductor technology. The prefix "nano-" comes from the Greek "nanos" meaning dwarf. It was officially adopted as an SI prefix in 1960.
Common mistakes
Confusing nanometres with angstroms—1 nm equals 10 angstroms. People also mistakenly equate "nano" products in marketing with actual nanometre-scale technology, which is not always the case.
What is inch?
An inch is a unit of length in imperial and US customary systems equal to 1/12 of a foot. It is widely used for screen sizes, display resolutions, pipe diameters, and small-scale measurements in everyday contexts.
Real-world uses
Inches are used throughout the United States, Canada (partially), and the UK for screen sizes, pipe diameters, lumber dimensions, and screw/bolt specifications. Display sizes for monitors, TVs, and phones are universally quoted in diagonal inches.
History
The inch has ancient origins, traditionally defined as the width of a man's thumb or three barleycorns laid end to end. It was standardized internationally in 1959 as exactly 25.4 mm, reconciling slight differences between British and American definitions.
Common mistakes
Assuming inch fractions are decimal—1/8 inch is 0.125 inches, not 0.18. Also, confusing nominal lumber sizes (a "2x4" is actually 1.5 × 3.5 inches) with actual inch measurements.
When is this conversion used?
Converting between nanometre and inch is common when working across metric and imperial systems, such as international trade, travel between countries with different measurement standards, or following instructions from a different region. Screen sizes, paper dimensions, and clothing measurements often require converting between centimetres and inches, especially when shopping internationally.
Worked examples
1 nanometre = 3.937008e-08 inch
1 inch = 0.0254 metre
How to convert nanometre to inch
To convert nanometre to inch, multiply the value by 3.937008e-08.
To convert inch back to nanometre, multiply by 25,400,000.
Measurement standards
The metre is one of seven SI base units, maintained by the International Bureau of Weights and Measures (BIPM). Since 2019, it is defined by fixing the numerical value of the speed of light in vacuum to exactly 299,792,458 metres per second.
Did you know?
A human hair is roughly 70 micrometres wide, while a single gold atom measures about 0.144 nanometres in diameter — meaning you could line up nearly half a million atoms across the width of one hair.
Quick reference: nanometre to inch
| nanometre | inch |
|---|---|
| 0.1 | 3.937008e-09 |
| 0.5 | 1.968504e-08 |
| 1 | 3.937008e-08 |
| 2 | 7.874016e-08 |
| 5 | 1.968504e-07 |
| 10 | 3.937008e-07 |
| 25 | 9.842520e-07 |
| 50 | 0.00000197 |
| 100 | 0.00000394 |
| 250 | 0.00000984 |
| 500 | 0.00001969 |
| 1,000 | 0.00003937 |
Common values
| nanometre | inch | |
|---|---|---|
| Height of a door | 2.100000e+09 nanometre | 82.67716535 inch |
| Basketball court length | 2.800000e+10 nanometre | 1,102.36220472 inch |
| Football field (soccer) | 1.050000e+11 nanometre | 4,133.85826772 inch |
| Marathon distance | 4.219500e+13 nanometre | 1,661,220.47244094 inch |
| Altitude of a cruising airplane | 1.066800e+13 nanometre | 420,000 inch |