Let the equation do the work.
Calculate absorbance or concentration with Beer–Lambert. Keep the units visible and follow every step.
Enter your values or load the teaching example.
No coefficient is assumed for your sample. The example uses an illustrative value.
Keep the units together
Calculations use mol/L and cm internally. 1 mM = 0.001 mol/L, 1 µM = 0.000001 mol/L and 10 mm = 1 cm. Changing a unit preserves the physical quantity.
The first release supports molar concentration. Mass units such as mg/L require a molecular mass and are not supported.
A guide to the units ↗An equation with conditions
The coefficient depends on the substance, wavelength and conditions. The idealised Beer–Lambert model does not establish experimental suitability. Scattering, chemical changes and instrument effects can cause departures from it.
Absorbance alone is not enough to determine concentration: supply a suitable coefficient and path length, or use a suitable calibration. Source: IUPAC Beer–Lambert law.