Beer Lambert Law Calculator
Calculate absorbance from molar absorptivity, concentration, and path length.
Beer Lambert Law measurements
Enter your values, then calculate.
Result
How to calculate beer lambert law
The Beer-Lambert law relates the absorbance of light passing through a solution to the solution's concentration, the path length of light through it, and the substance's molar absorptivity — a foundational relationship in analytical chemistry and spectroscopy.
How the calculation works
Absorbance = Molar absorptivity (ε) × Concentration × Path length.
Example
A molar absorptivity of 15,000 L/(mol·cm), concentration of 0.0002 mol/L, path length of 1 cm: Absorbance = 15,000 × 0.0002 × 1 = 3.0.
Frequently asked questions
How is Result calculated?
Result = [Molar absorptivity] × [Concentration] × [Path length].
Is the Beer Lambert Law Calculator free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Beer Lambert Law Calculator
Absorbance = Molar absorptivity (ε) × Concentration × Path length.
Let's understand your beer lambert law result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Beer Lambert Law
- Molar absorptivity is specific to a substance at a particular wavelength — use the correct ε value for your specific compound and the wavelength you're measuring at.
- The Beer-Lambert law assumes dilute solutions and monochromatic light; it can break down at very high concentrations due to molecular interactions.
Common Beer Lambert Law Mistakes to Avoid
- Applying a molar absorptivity value measured at one wavelength to absorbance measurements taken at a different wavelength, since ε is wavelength-specific.
When to Use This Calculator
The Beer-Lambert law relates the absorbance of light passing through a solution to the solution's concentration, the path length of light through it, and the substance's molar absorptivity — a foundational relationship in analytical chemistry and spectroscopy.