Unit Converter

Chemistry-focused conversions across pressure, energy (and energy per mol), amount, volume and mass.

How to use this tool

Convert a chemistry quantity from one unit to another, pressures, energies (including per-mole), amounts, volumes and masses, each routed cleanly through its SI base unit.

What to enter

Quantity type: the kind of quantity (pressure, energy, energy/mol, amount, volume, mass). This sets which units are offered.
Value: the number you want to convert.
From / To: the starting unit and the unit you want the answer in.

Reading the result

You get the converted value, with a note of the SI base unit (Pa, J, mol, L, g) it passed through on the way.

Worked example

Pick Pressure, enter 1, and convert atm → mmHg to get 760 mmHg (1 atm = 101.325 kPa).

Convert

Quantity type

Choose the kind of quantity, this sets which units appear below. Value

The number to convert, expressed in the "From" unit.

From

→

Result

Every conversion routes through the SI base unit shown (Pa, J, mol, L, g), so any From → To pair within the same quantity type is exact.

Methodology

All units are converted through a base SI unit (Pa for pressure, J for energy, mol for amount, L for volume, g for mass). Factors are conventional SI definitions.