Length Converters
Convert between length units relevant to chemistry: nanometers, angstroms, picometers, micrometers, millimeters, centimeters, and meters. Used for bond lengths, wavelengths, and crystal structures.
Length at the molecular scale uses units that most people never encounter. Bond lengths are measured in angstroms (Å) or picometers (pm), light wavelengths in nanometers (nm), and cell structures in micrometers (µm). Converting between these small-scale units — and connecting them to everyday metric units — is essential for crystallography, spectroscopy, and molecular modeling.
64 Length Conversions
Angstroms to Centimeters Converter
cm = Å × 1 × 10⁻⁸
Convert angstroms to centimeters by multiplying by 10⁻⁸. The eight-decade gap separating crystallographic bond lengths and macroscopic CGS measurements.
Angstroms to Meters Converter
m = Å × 10⁻¹⁰
Convert ångströms to meters by multiplying by 10⁻¹⁰. Useful any time crystallographic bond-length values in Å and the SI base unit physical-chemistry equations expect have to agree.
Angstroms to Micrometers Converter
µm = Å × 0.0001
Convert angstroms to micrometers by multiplying by 10⁻⁴. Four prefix decades sit between atomic-scale crystallography and the µm scale of optical microscopy.
Angstroms to Nanometers Converter
nm = Å / 10
Divide ångströms by 10 to get nanometers. A factor-of-10 shift between the crystallographer's preferred unit and the SI nanoscale unit — both of which show up constantly in modern materials work.
Angstroms to Picometers Converter
pm = Å × 100
Convert ångströms to picometers by multiplying by 100. A clean factor of 100 that bridges the crystallography-standard unit with the strictly SI-recommended one.
Centimeters to Angstroms Converter
Å = cm × 10⁸
Convert centimeters to ångströms by multiplying by 10⁸. The bridge across eight orders of magnitude between bench-scale lengths and atomic-scale bond and crystallographic distances.
Centimeters to Feet Converter
ft = cm × 0.032808
Convert centimeters to feet by multiplying by 0.032808. Used at the handoff between metric lab-equipment dimensions and the feet that show up on US architectural drawings.
Centimeters to Inches Converter
in = cm ÷ 2.54
Convert centimeters to inches by dividing by 2.54. The reverse-direction bridge between metric equipment specs and US imperial drawings.
Centimeters to Meters Converter
m = cm / 100
Convert centimeters to meters by dividing by 100. The clean SI step that takes a bench-scale dimension into the base length unit physical-chemistry equations work with.
Centimeters to Micrometers Converter
µm = cm × 10000
Convert centimeters to micrometers by multiplying by 10000. Useful any time bench-scale dimensions and the µm scale of microscopy, filter pores, and chromatography particles have to agree.
Centimeters to Millimeters Converter
mm = cm × 10
Convert centimeters to millimeters by multiplying by 10. The everyday step between cuvette path lengths quoted in cm and column or tubing dimensions quoted in mm.
Centimeters to Nanometers Converter
nm = cm × 10⁷
Convert centimeters to nanometers by multiplying by 10⁷. The bridge across seven orders of magnitude between bench-scale lengths and the nanometer scale of light wavelengths and nanoparticle dimensions.
Centimeters to Picometers Converter
pm = cm × 10¹⁰
Convert centimeters to picometers by multiplying by 10¹⁰. The ten-decade gap separating macroscopic ruler measurements and atomic-scale bond lengths.
Chains to Meters Length Converter
m = chain × 20.1168
Convert chains to meters by multiplying by 20.1168. Used at the handoff between old US land-survey records into the metric distances modern environmental work runs in.
Fathoms to Meters Depth Converter
m = fathom × 1.8288
Convert fathoms to meters by multiplying by 1.8288. A unit step between US/UK nautical-chart depths into the metric depths a modern oceanographic record uses.
Feet to Centimeters Converter
cm = ft × 30.48
Convert feet to centimeters by multiplying by 30.48. The exact bridge between US-spec architectural lab dimensions and the cm units European-built equipment uses.
Feet to Inches Converter
inches = feet × 12
Convert feet to inches by multiplying by 12. The basic step within US customary units, useful for translating architectural lab dimensions to component-level specs.
Feet to Meters Converter
m = ft × 0.3048
Convert feet to meters by multiplying by 0.3048. The reverse of the architectural length conversion, useful any time US imperial drawings meet metric process specs.
Frequency to Wavelength Converter
nm = 2.998 × 10¹⁷ ÷ Hz
Convert frequency to wavelength via λ = c/ν. The exact relationship that links a laser-spec frequency to the wavelength spectroscopy plots run in.
Frequency to Wavenumber Converter
cm⁻¹ = ν (Hz) ÷ c where c = 2.998 × 10¹⁰ cm/s; equivalently, cm⁻¹ ≈ Hz × 3.336 × 10⁻¹¹
Convert frequency in hertz to wavenumber in cm⁻¹ by dividing by the speed of light in cm/s. The step that turns a raw THz output into the unit IR spectroscopy actually reads.
Inches to Centimeters Converter
cm = in × 2.54
Convert inches to centimeters by multiplying by 2.54. An exact conversion (by definition) that shows up on everything from tubing fittings to column dimensions.
Inches to Feet Converter
feet = inches / 12
Convert inches to feet by dividing by 12. The basic step within US customary units, useful when aggregating instrument-scale dimensions into facility-scale measurements.
Inches to Millimeters Converter
mm = inches × 25.4
Convert inches to millimeters by multiplying by 25.4. The exact bridge between US-spec hardware dimensions and the metric units lab glassware uses.
Kilometers to Miles Length Converter
mi = km × 0.621371
Convert kilometers to miles by multiplying by 0.621371. The reverse-direction bridge between metric field measurements and US regulatory distances.
Kilometers to Nautical Miles Converter
nmi = km × 0.539957
Convert kilometers to nautical miles by multiplying by 0.539957. Comes up at the boundary of SI land-distance reporting and the maritime nautical-mile convention IMO and ICAO use.
Light-Years to Meters Converter
m = ly × 9.461 × 10¹⁵
Multiply by 9.461 × 10¹⁵ to push light-years into meters. Astrochemistry is essentially the only context where you'd ever need to — but if you're calculating optical depth along a sightline through a molecular cloud, your path length has to be in SI before anything works.
Meters to Angstroms Converter
Å = m × 10¹⁰
Convert meters to ångströms by multiplying by 10¹⁰. Comes up at the boundary of SI base lengths and the Å values used at the bond and crystallographic scale.
Meters to Centimeters Converter
cm = m × 100
Convert meters to centimeters by multiplying by 100. Useful any time SI lengths in physical-chemistry equations and the CGS-flavored cm units chemists use at the bench have to agree.
Meters to Chains Length Converter
chain = m × 0.049710
Convert meters to chains by multiplying by 0.04971. Used at the handoff between modern metric site-survey distances into the chain-based historical US land-survey records.
Meters to Fathoms Depth Converter
fathom = m × 0.546807
Convert meters to fathoms by multiplying by 0.546807. Comes up at the boundary of modern metric oceanographic depths into the fathom-based legacy nautical-chart records.
Meters to Feet Converter
ft = m × 3.28084
1 m = 3.28084 ft, exact since the 1959 definition of the foot as 0.3048 m. Useful whenever a metric facility spec has to land on a US-customary document — fume hood heights, piping runs, fire-code paperwork.
Meters to Light-Years Converter
ly = m ÷ (9.461 × 10¹⁵)
Convert meters to light-years by dividing by 9.461 × 10¹⁵. Useful any time SI laboratory distances into the astronomical scales radio-spectroscopic observations report in have to agree.
Meters to Micrometers Converter
µm = m × 10⁶
Six prefix decades separate meters from micrometers (×10⁶). It's the same gap between a bioreactor vessel and the cells suspended inside it — both ends of the calculation matter at once in process scale-up.
Meters to Millimeters Converter
mm = m × 1000
Convert meters to millimeters by multiplying by 1000. The decimal step bridging vessel-scale process dimensions and bench-scale lab specifications.
Meters to Nanometers Converter
nm = m × 1000000000
Convert meters to nanometers by multiplying by 10⁹. Nine prefix decades sit between optical-bench dimensions and the nm scale of UV-Vis wavelengths.
Meters to Yards Converter
yd = m × 1.09361
Convert meters to yards by multiplying by 1.09361. A close conversion (meters and yards are within 10% of each other) used mostly for facility specs and imperial bulk-supply catalogs.
Micrometers to Angstroms Converter
Å = µm × 10000
Convert micrometers to angstroms by multiplying by 10⁴. The four-decade gap separating optical-microscopy dimensions and atomic-resolution crystallography.
Micrometers to Centimeters Converter
cm = µm ÷ 10000
Convert micrometers to centimeters by dividing by 10,000. Four prefix decades sit between microscopy-scale features and bench-scale dimensions.
Micrometers to Meters Converter
m = µm × 10⁻⁶
Convert micrometers to meters by multiplying by 10⁻⁶. A six-decade SI prefix jump between cellular-scale measurements and SI-base laboratory dimensions.
Micrometers to Millimeters Converter
mm = µm / 1000
Convert micrometers (microns) to millimeters by dividing by 1000. Comes up at the boundary of particle-scale numbers off an instrument and the bench-scale dimensions on glassware.
Micrometers to Nanometers Converter
nm = µm × 1000
Convert micrometers to nanometers by multiplying by 1000. The decimal step bridging conventional optical microscopy and the nm scale of super-resolution and nanoparticle work.
Micrometers to Picometers Converter
pm = µm × 10⁶
Convert micrometers to picometers by multiplying by 10⁶. A jump of six prefix decades, the gap between optical-microscopy dimensions and atomic-resolution bond lengths.
Miles to Kilometers Length Converter
km = mi × 1.60934
1 mile = 1.60934 km, exact since 1959. Not a bench unit, but it shows up wherever a US regulatory distance — emission buffer, monitoring radius, evacuation zone — has to land in an international atmospheric model written in km.
Millimeters to Centimeters Converter
cm = mm / 10
Convert millimeters to centimeters by dividing by 10. The cleanest unit step in chemistry — useful when an instrument reads mm but a downstream calculation expects cm.
Millimeters to Inches Converter
inches = mm × 0.03937
Convert millimeters to inches by dividing by 25.4. The fine-scale bridge between metric lab equipment and imperial machine-shop sizing.
Millimeters to Meters Converter
m = mm × 0.001
Convert millimeters to meters by dividing by 1000. The milli prefix step bridging benchtop equipment dimensions and SI base length units.
Millimeters to Micrometers Converter
µm = mm × 1000
Convert mm to µm by multiplying by 1000. The decimal step bridging benchtop column dimensions and the µm-scale particle specs that determine column performance.
Millimeters to Nanometers Converter
nm = mm × 10⁶
Convert mm to nm by multiplying by 10⁶. Six prefix decades sit between benchtop dimensions and the nanoscale used in spectroscopy and nanoparticle work.
Nanometers to Angstroms Converter
Å = nm × 10
Convert nanometers to ångströms by multiplying by 10. The reverse direction of the most common molecular-scale unit conversion.
Nanometers to Centimeters Converter
cm = nm × 10⁻⁷
Convert nanometers to centimeters by multiplying by 10⁻⁷. A seven-decade SI prefix jump between spectroscopy wavelengths and benchtop dimensions.
Nanometers to Meters Converter
m = nm ÷ 1000000000
Convert nanometers to meters by dividing by 10⁹. Nine prefix decades sit between spectroscopy wavelengths and SI base length units.
Nanometers to Micrometers Converter
µm = nm / 1000
Convert nanometers to micrometers by dividing by 1000. The decimal step bridging nanoparticle and spectroscopy nm scales with the µm scale of optical microscopy.
Nanometers to Millimeters Converter
mm = nm ÷ 1000000
Divide nanometers by 10⁶ to get millimeters — six prefix decades. That's the gap between particle-scale chemistry and anything you can actually see without a microscope.
Nanometers to Picometers Converter
pm = nm × 1000
Convert nanometers to picometers by multiplying by 1000. The step that takes you from nanoscale particle and wavelength dimensions down to the bond-length scale of individual atoms.
Nautical Miles to Kilometers Converter
km = nmi × 1.852
One nautical mile is 1.852 km, exactly. The factor was pinned in 1929; before that, the nmi was defined as one minute of arc along Earth's meridian, which is also why 1° of latitude is 60 nmi or about 111 km.
Picometers to Angstroms Converter
Å = pm / 100
Convert picometers to ångströms by dividing by 100. Used at the handoff between SI-recommended pm in modern bond-length tables and the Å that crystallographers still report.
Picometers to Centimeters Converter
cm = pm × 10⁻¹⁰
Convert picometers to centimeters by multiplying by 10⁻¹⁰. A jump of ten prefix decades, the gap between atomic-scale bond lengths and macroscopic ruler measurements.
Picometers to Micrometers Converter
µm = pm × 10⁻⁶
Convert picometers to micrometers by multiplying by 10⁻⁶. A six-decade SI prefix jump between atomic-resolution bond lengths and microscopy field of view sizes.
Picometers to Nanometers Converter
nm = pm / 1000
Convert picometers to nanometers by dividing by 1000. The step that pulls bond-length numbers up into the nanoscale where particles, ligand shells, and DNA spacings are described.
Wavelength to Frequency Converter
Hz = c ÷ λ = 2.998 × 10¹⁷ ÷ nm
Convert wavelength in nm to frequency in Hz via ν = c/λ. Shows up when spectral wavelengths must feed into the frequency form Planck-relation energy calculations report.
Wavelength to Wavenumber Converter
cm⁻¹ = 10⁷ ÷ nm
Convert wavelength in nm to wavenumber in cm⁻¹ using ν̃ = 10⁷/λ. The conversion between instrument output and the spectroscopy convention that shows up in almost every IR paper.
Wavenumber to Frequency Converter
Hz = cm⁻¹ × c = cm⁻¹ × 2.998 × 10¹⁰
Convert wavenumber in cm⁻¹ to frequency in hertz by multiplying by the speed of light in cm/s. The step for connecting an IR peak position to a genuine frequency for photon-energy or quantum-mechanical calculations.
Wavenumber to Wavelength Converter
nm = 10⁷ ÷ cm⁻¹
Convert wavenumber in cm⁻¹ to wavelength in nm by dividing 10⁷ by the wavenumber. The reverse direction of the most common spectroscopy unit conversion.
Yards to Meters Converter
m = yd × 0.9144
Convert yards to meters by multiplying by 0.9144. The factor follows directly from the international yard definition.