Unit system metric
Unit of length
Symbol nm 
Unit conversions
1 nm in ... ... is equal to ...
    SI units    1×10−9  m
    Natural units    6.1877×1025  P
18.897  a0
    imperial/ US units    3.2808×10−9  ft
 3.9370×10−8  in

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 metric system, equal to one billionth ( short scale) of a metre (0.000000001 m). The name combines the SI prefix nano- (from the Ancient Greek νάνος, nanos, "dwarf") with the parent unit name metre (from Greek μέτρον, metrοn, "unit of measurement"). It can be written in scientific notation as 1×10−9 m, in engineering notation as 1 E−9 m, and is simply 1/1000000000 metres. One nanometre equals ten ångströms. When used as a prefix for something other than a unit of measure (as in "nanoscience"), nano refers to nanotechnology, or phenomena typically occurring on a scale of nanometres (see nanoscopic scale). [1]

The nanometre is often used to express dimensions on an atomic scale: the diameter of a helium atom, for example, is about 0.1 nm, and that of a ribosome is about 20 nm. The nanometre is also commonly used to specify the wavelength of electromagnetic radiation near the visible part of the spectrum: visible light ranges from around 400 to 700 nm. [2] The ångström, which is equal to 0.1 nm, was formerly used for these purposes, but is still used in other fields. Since the late 1980s, in usages such as 32 nm and 22 nm, it has also been used to describe typical feature sizes in successive generations of the ITRS Roadmap for miniaturization in the semiconductor industry.


The nanometre was formerly known as the millimicrometre – or, more commonly, the millimicron for short – since it is 1/1000 of a micron (micrometre), and was often denoted by the symbol mµ or (more rarely and confusingly, since it logically should refer to a millionth of a micron) as µµ. [1] [3] [4]

Other Languages
Afrikaans: Nanometer
العربية: نانومتر
aragonés: Nanometro
asturianu: Nanómetru
Bân-lâm-gú: Nāi-bí
башҡортса: Нанометр
български: Нанометър
bosanski: Nanometar
català: Nanòmetre
Чӑвашла: Нанометр
čeština: Metr#Nanometr
Cymraeg: Nanomedr
dansk: Nanometer
Deutsch: Nanometer
eesti: Nanomeeter
Ελληνικά: Νανόμετρο
emiliàn e rumagnòl: Nanòmeter
español: Nanómetro
Esperanto: Nanometro
euskara: Nanometro
فارسی: نانومتر
français: Nanomètre
galego: Nanómetro
客家語/Hak-kâ-ngî: Nai-mí
한국어: 나노미터
Հայերեն: Նանոմետր
Bahasa Indonesia: Nanometer
interlingua: Nanometro
íslenska: Nanómetri
italiano: Nanometro
עברית: נאנומטר
қазақша: Нанометр
Kiswahili: Nanomita
Latina: Nanometrum
latviešu: Nanometrs
македонски: Нанометар
മലയാളം: നാനോമീറ്റർ
मराठी: नॅनोमीटर
Bahasa Melayu: Nanometer
монгол: Нанометр
Nederlands: Nanometer
norsk: Nanometer
norsk nynorsk: Nanometer
پنجابی: نینو میٹر
polski: Nanometr
português: Nanómetro
română: Nanometru
русский: Нанометр
саха тыла: Нанометр
Scots: Nanometre
shqip: Nanometri
Simple English: Nanometre
slovenčina: Nanometer
slovenščina: Nanometer
српски / srpski: Нанометар
srpskohrvatski / српскохрватски: Nanometar
svenska: Nanometer
Tagalog: Nanometro
Türkçe: Nanometre
українська: Нанометр
Vahcuengh: Nazmij
Tiếng Việt: Nanômét
Winaray: Nanometro
粵語: 納米
中文: 纳米