Beer-Lambert Law Calculator
Absorbance, concentration and path length.
Enter your values
ⓘ Live results
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.
Worked example
Using the values the calculator loads with:
Inputs
- Absorbance0.62
- Molar absorptivity8400 M⁻¹cm⁻¹
- Path length1 cm
Results
- Concentration7.3810e-5 M
- In micromolar73.81
- Transmittance23.99%
- Absorbance0.62
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.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.