How many cm is 1 nanometer?

One ten-millionth of a centimetre, 0.0000001 cm, which the converter prints as 1e-7 cm because a magnitude below 0.000001 is shown in exponential notation. The pattern holds at every size: 10 nm is 0.000001 cm, 100 nm is 0.00001 cm, 500 nm is 0.00005 cm, 1,000 nm is 0.0001 cm, 10,000 nm is 0.001 cm and 1,000,000 nm is 0.1 cm. Ten million nanometres make exactly one centimetre.

What is the formula for nm to cm?

Centimetres = nanometres / 10,000,000, and nanometres = centimetres times 10,000,000 in the other direction, so 0.5 cm is 5,000,000 nm. Nano means 10 to the minus 9 metres and centi means 10 to the minus 2, which leaves exactly seven orders of magnitude between the two units. Because the factor is a power of ten the conversion only shifts the decimal point, seven places to the left going down to centimetres, and there is no repeating tail of the kind you get converting to inches, where 10,000,000 nm is 0.393700787402 in.

Why does the answer read 1e-7 instead of 0.0000001?

Because a magnitude below 0.000001 is printed in exponential notation, which beats counting zeroes: 1 nm is 1e-7 cm, 5 nm is 5e-7 cm and 0.1 nm, one angstrom, is 1e-8 cm. Above that threshold the display stays decimal, so 10 nm reads 0.000001 cm and 380 nm reads 0.000038 cm. The From box reads exponents as well as digits, so typing 2.5e7 is taken as 25,000,000 nm, and Copy result copies the headline exactly as printed, without the thousands separators.

What is a 500 nm wavelength in centimetres?

For an explicitly supplied 500 nm wavelength, the length is exactly 0.00005 cm. Separately supplied 380 nm and 700 nm lengths are exactly 0.000038 cm and 0.00007 cm. Conversion alone does not establish a visible-light band, medium, source wavelength or the convention of a scientific formula. The common readout also lists millimeters, meters and inches.

Is nm to cm the same as nm to cm-1, the wavenumber?

No. For a supplied positive wavelength, ordinary spectroscopic wavenumber in cm⁻¹ is the reciprocal of its centimeter length: 500 nm = 0.00005 cm gives exactly 20,000 cm⁻¹. Calculate separately as 10,000,000 / original nm, so 1,000 nm gives exactly 10,000 cm⁻¹. This converter only scales length and does not take a reciprocal; zero has no finite reciprocal. Angular wavenumber uses a different 2π factor, so the source must state which quantity it means.

How many nanometres are in an inch?

25,400,000, because an inch is exactly 2.54 cm and every centimetre is 10,000,000 nm. Put 25,400,000 in the From box and the headline reads 2.54 cm, with 25.4 mm, 0.0254 m and 1 in in the list below it. The Swap units button between the two boxes reverses the pair, so this page becomes a centimetres to nanometres converter without a reload: 1 cm gives 10,000,000 nm and 2.54 cm gives 25,400,000 nm.

Why does the page open on nm and cm when I last converted something else?

This focused page opens on Nanometer and Centimeter, while preserving the main converter’s saved unit pair. When storage is usable, a saved value and uncommon-unit preference can travel between pages. Its suffix must still match From. Valid deliberate scalar edits can save those fields after a short delay; invalid or incomplete drafts preserve the saved record. Unusable or conflicting records remain until you use Forget saved settings, which keeps the current conversion on screen. Your input and converted values are calculated in the browser and are not uploaded by the converter. The definitions arrive with the page, so conversion needs no external data lookup and keeps working offline after the page has loaded. The core conversion needs no account. Copy result copies the displayed headline without digit-grouping commas; each visible conversion row has its own Copy button. Displayed and copied values round to twelve significant digits. If native copying fails, a complete selectable summary identifies the input, selected pair and conventions and includes every unit in the category, including uncommon units.

Nm to CM Converter

A centimetre is exactly 10,000,000 nanometres, so nanometres to centimetres is one division: cm = nm / 10000000, which moves the decimal point seven places to the left. That is why 100 nm is 0.00001 cm, 1,000 nm is 0.0001 cm, 10,000 nm is 0.001 cm, 5,000,000 nm is 0.5 cm and 10,000,000 nm is exactly 1 cm. Nano is the SI prefix for a billionth of a metre and centi for a hundredth, so the seven orders of magnitude between them are a definition rather than a measurement, and decimal-rational arithmetic preserves the written scalar and exact factor before display rounding. That gap is wide enough that small nanometre figures fall off the bottom of decimal display: answers print to twelve significant digits and a magnitude below 0.000001 switches to exponential notation, so 1 nm reads 1e-7 cm while 10 nm is the first whole number of nanometres that prints as a decimal, 0.000001 cm. This page opens the converter with Nanometer (nm) in the From box and Centimeter (cm) in the To box, whatever pair you converted last, and the list under the answer carries the same length in millimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles.

From

To1e-7

Category: Length

Base unit: meter

Uncommon units: Show 7 more

Feet, yards and miles use international definitions. A light year uses a 365.25-day Julian year; the parsec coefficient is approximate.

Results round to 12 significant digits using the listed unit definitions. Input must have a finite numeric magnitude and at most 512 significant digits. Type a single decimal or scientific number; a matching From unit suffix is accepted. Commas and grouped spaces separate thousands; decimal commas, fractions and compound measurements are refused.

1 nm in every length unit

Millimetermm
0.000001
Centimetercm
1e-7
Meterm
1e-9
Kilometerkm
1e-12
Inchin
3.93700787402e-8
Footft
3.28083989501e-9
Yardyd
1.09361329834e-9
Milemi
6.21371192237e-13
Nautical milenmi
5.39956803456e-13

Selectable complete conversion

Unit Converter — Length
Input: 1 (Nanometer, nm)
Result: 1e-7 cm (Centimeter)
Displayed values round to 12 significant digits.
Feet, yards and miles use international definitions. A light year uses a 365.25-day Julian year; the parsec coefficient is approximate.
All other units:
Micrometer (µm): 0.001
Millimeter (mm): 0.000001
Centimeter (cm): 1e-7
Meter (m): 1e-9
Kilometer (km): 1e-12
Inch (in): 3.93700787402e-8
Foot (ft): 3.28083989501e-9
Yard (yd): 1.09361329834e-9
Mile (mi): 6.21371192237e-13
Nautical mile (nmi): 5.39956803456e-13
Thou (mil): 0.0000393700787402
Furlong (fur): 4.9709695379e-12
Astronomical unit (AU): 6.68458712227e-21
Light year (ly): 1.05700083402e-25
Parsec (pc): 3.24077928944e-26

Common questions

How many cm is 1 nanometer?: One ten-millionth of a centimetre, 0.0000001 cm, which the converter prints as 1e-7 cm because a magnitude below 0.000001 is shown in exponential notation. The pattern holds at every size: 10 nm is 0.000001 cm, 100 nm is 0.00001 cm, 500 nm is 0.00005 cm, 1,000 nm is 0.0001 cm, 10,000 nm is 0.001 cm and 1,000,000 nm is 0.1 cm. Ten million nanometres make exactly one centimetre.
What is the formula for nm to cm?: Centimetres = nanometres / 10,000,000, and nanometres = centimetres times 10,000,000 in the other direction, so 0.5 cm is 5,000,000 nm. Nano means 10 to the minus 9 metres and centi means 10 to the minus 2, which leaves exactly seven orders of magnitude between the two units. Because the factor is a power of ten the conversion only shifts the decimal point, seven places to the left going down to centimetres, and there is no repeating tail of the kind you get converting to inches, where 10,000,000 nm is 0.393700787402 in.
Why does the answer read 1e-7 instead of 0.0000001?: Because a magnitude below 0.000001 is printed in exponential notation, which beats counting zeroes: 1 nm is 1e-7 cm, 5 nm is 5e-7 cm and 0.1 nm, one angstrom, is 1e-8 cm. Above that threshold the display stays decimal, so 10 nm reads 0.000001 cm and 380 nm reads 0.000038 cm. The From box reads exponents as well as digits, so typing 2.5e7 is taken as 25,000,000 nm, and Copy result copies the headline exactly as printed, without the thousands separators.
What is a 500 nm wavelength in centimetres?: For an explicitly supplied 500 nm wavelength, the length is exactly 0.00005 cm. Separately supplied 380 nm and 700 nm lengths are exactly 0.000038 cm and 0.00007 cm. Conversion alone does not establish a visible-light band, medium, source wavelength or the convention of a scientific formula. The common readout also lists millimeters, meters and inches.
Is nm to cm the same as nm to cm-1, the wavenumber?: No. For a supplied positive wavelength, ordinary spectroscopic wavenumber in cm⁻¹ is the reciprocal of its centimeter length: 500 nm = 0.00005 cm gives exactly 20,000 cm⁻¹. Calculate separately as 10,000,000 / original nm, so 1,000 nm gives exactly 10,000 cm⁻¹. This converter only scales length and does not take a reciprocal; zero has no finite reciprocal. Angular wavenumber uses a different 2π factor, so the source must state which quantity it means.
How many nanometres are in an inch?: 25,400,000, because an inch is exactly 2.54 cm and every centimetre is 10,000,000 nm. Put 25,400,000 in the From box and the headline reads 2.54 cm, with 25.4 mm, 0.0254 m and 1 in in the list below it. The Swap units button between the two boxes reverses the pair, so this page becomes a centimetres to nanometres converter without a reload: 1 cm gives 10,000,000 nm and 2.54 cm gives 25,400,000 nm.
Where do nanometre and centimetre sit in the list under the answer?: Centimetre is a common length unit, so it appears in the list as well as in the headline. Nanometre never appears there, because the list leaves out the unit you are converting from. By default the list shows millimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles; flip the switch in the readout, labelled Show 7 more, and it adds micrometre, thou, furlong, astronomical unit, light year and parsec. Both dropdowns list every length unit at all times, uncommon ones included, so nanometre is always selectable.
Why does the page open on nm and cm when I last converted something else?: This focused page opens on Nanometer and Centimeter, while preserving the main converter’s saved unit pair. When storage is usable, a saved value and uncommon-unit preference can travel between pages. Its suffix must still match From. Valid deliberate scalar edits can save those fields after a short delay; invalid or incomplete drafts preserve the saved record. Unusable or conflicting records remain until you use Forget saved settings, which keeps the current conversion on screen. Your input and converted values are calculated in the browser and are not uploaded by the converter. The definitions arrive with the page, so conversion needs no external data lookup and keeps working offline after the page has loaded. The core conversion needs no account. Copy result copies the displayed headline without digit-grouping commas; each visible conversion row has its own Copy button. Displayed and copied values round to twelve significant digits. If native copying fails, a complete selectable summary identifies the input, selected pair and conventions and includes every unit in the category, including uncommon units.

Results round to 12 significant digits using the listed unit conventions. Many factors are exact definitions; psi and parsec use rounded coefficients. Temperature includes scale offsets. Days and weeks are fixed-duration units, and unit conversion does not determine calendar dates, ambient pressure or a software label’s convention.