What is the UV-Vis Calculator?

The UV-Vis Calculator helps determine either the absorbance (A) or the concentration (c) of a solution using Beer–Lambert Law (A = ε × b × c). By entering the known values for molar absorptivity (ε), path length (b), and leaving exactly one unknown field blank, the calculator computes the missing parameter instantly. This tool is ideal for chemistry students, researchers, and lab technicians working with spectrophotometric measurements, enabling quick analysis of solution properties and verification of experimental data.

How to Use:

1. Enter Absorbance (A): Provide the measured absorbance, or leave blank if you want to calculate it.
2. Enter Molar Absorptivity (ε): Fill in the known ε value in L·mol⁻¹·cm⁻¹.
3. Enter Path Length (b): Type the cuvette path length in centimeters.
4. Enter Concentration (c): Provide the solution concentration in mol/L, or leave blank if unknown.
5. Leave Exactly One Field Blank: The calculator requires two known values to compute the missing one.
6. Click “Calculate”: The tool applies Beer–Lambert Law to find the unknown parameter.
7. Review the Result: Use the calculated absorbance or concentration for spectrophotometric experiments, analysis, or lab reporting.