The nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the International System of Units (SI), equal to one billionth (short scale) of a metre (0.000000001 m) and to 1000 picometres. One nanometre can be expressed in scientific notation as 1×10−9 m, and as 1/1000000000 metres.

one nanometric carbon nanotube, photographed with scanning tunneling microscope
Unit systemSI
Unit oflength
1 nm in ...... is equal to ...
   SI units   1×10−9 m
1×103 pm
   Natural units   6.1877×1025 P
18.897 a0
   imperial/US units   3.2808×10−9 ft
3.9370×10−8 in
Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales. The nanometre is often used to express dimensions on an atomic scale and mostly in the molecular scale.

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This article uses material from the Wikipedia article Nanometre, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.