Beer-Lambert Law Calculator
Absorbance, concentration and path length.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Concentration
- 7.3810e-5 M
- In micromolar
- 73.81
- Transmittance
- 23.99%
- Absorbance
- 0.62
Quick answer
Absorbance is proportional to concentration and path length via molar absorptivity.
A = ε × l × c
How to use the Beer-Lambert Law Calculator
- 1Enter the measured absorbance.
- 2Enter molar absorptivity for the analyte and wavelength.
- 3Enter the cuvette path length.
Frequently asked questions
What absorbance range is reliable?
0.1–1.0 — outside that, detectors lose linearity.
Why is transmittance shown?
Some instruments report %T rather than absorbance.