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Rad
Deg
Grad
Constants
Select a constant:
Atomic mass unit
Avogadro constant
Bohr magneton
Bohr radius
Boltzmann constant
e
Elementary charge
Faraday constant
Fine structure constant
Gas constant
Hartree energy
Mass of the electron
Mass of the neutron
Mass of the proton
Nuclear magneton
pi
Planck constant
Rydberg constant
Speed of light
Standard acceleration
Stefan-Boltzmann constant
Vacuum permeability
Vacuum permittivity
Converter
(i) energy units:
Convert from:
joules (J)
calories (Cal)
electron volts (eV)
cubic centrimetre atmospheres
erg
atomic units (hartree)
Convert to:
joules (J)
calories (Cal)
electron volts (eV)
cubic centrimetre atmospheres
erg
atomic units (hartree)
(ii) energy per mole and molecule and spectroscopic units:
Convert from:
wavelength (nm)
wavenumber (1/cm)
frequency (Hz)
electron volts (eV per molecule)
atomic units (hartree per molecule)
kilojoules per mole (kJ/mol)
Convert to:
wavelength (nm)
wavenumber (1/cm)
frequency (Hz)
electron volts (eV per molecule)
atomic units (hartree per molecule)
kilojoules per mole (kJ/mol)
(iii) pressure:
Convert from:
Pascal (Pa or N/m^2)
Bar (bar)
Atmospheres (atm)
torr or mm of mercury (Torr or mmHg)
dyne per cm^2 (dyne/cm^2)
pound per square inch (psi)
Convert to:
Pascal (Pa or N/m^2)
Bar (bar)
Atmospheres (atm)
torr or mm of mercury (Torr or mmHg)
dyne per cm^2 (dyne/cm^2)
pound per square inch (psi)
(iv) temperature:
Convert from:
Kelvins (K)
Celsius (' C)
Fahrenheit (' F)
Réaumur (' Réaumur)
Rankine (' Rankine)
Convert to:
Kelvins (K)
Celsius (' C)
Fahrenheit (' F)
Réaumur (' Réaumur)
Rankine (' Rankine)
(v) length:
Convert from:
metres (m)
picometres (pm)
nanometres (nm)
angstroms (A)
Bohrs (au)
inches
feet
yards
miles
Convert to:
metres (m)
picometres (pm)
nanometres (nm)
angstroms (A)
Bohrs (au)
inches
feet
yards
miles
(vi) area:
Convert from:
square metre (m^2)
square decimetre (dm^2)
square centimetre (cm^2)
square angstroms (A^2)
square inches
square feet
square yards
Convert to:
square metre (m^2)
square decimetre (dm^2)
square centimetre (cm^2)
square angstroms (A^2)
square inches
square feet
square yards
(vii) volume:
Convert from:
cubic metre (m^3)
cubic decimetre (dm^3)
cubic centimetre (cm^3)
litre (l)
centilitre (cl)
millimetre (ml)
cubic angstroms (A^3)
cubic inches
cubic feet
cubic yards
Convert from:
Convert to:
cubic metre (m^3)
cubic decimetre (dm^3)
cubic centimetre (cm^3)
litre (l)
centilitre (cl)
millimetre (ml)
cubic angstroms (A^3)
cubic inches
cubic feet
cubic yards
(viii) mass:
Convert from:
kilograms (kg)
grams (g)
metric tonnes (t)
atomic mass units (amu)
ounces
pounds
stones
tons
Convert to:
kilograms (kg)
grams (g)
metric tonnes (t)
atomic mass units (amu)
ounces
pounds
stones
tons
How do I use the calculator?
The mathematical functions of the calculator are very much like those on a standard scientific calculator. Enter a number using either the keyboard or by pressing the calculator buttons and perform mathematical functions by pressing the buttons. Select the number of decimal places to display by using the menu on the left hand side. The calculator also offers useful chemical features:
enter a chemical formula using standard notation including square and round brackets and press return to calculate its relative molecular mass
enter a chemical, physical or mathematical constant into a calculation by using the drop down menu on the right hand side.
convert between common units used in chemistry and science by entering the number to convert, selecting its units using one of the drop down menus on the right hand side and then select the units you wish to convert to.
