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Beer-Lambert Law Absorbance & Transmittance Calculator

A = εcl — absorbance from molar absorptivity, concentration, path.

Calculates absorbance, transmittance, and concentration in a Beer-Lambert spectrophotometry experiment from molar absorptivity, concentration, and path length.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

A = ε × c × l; T = 10^(−A); A = −log₁₀(T)

In depth

Calculates absorbance, transmittance, and concentration in a Beer-Lambert spectrophotometry experiment from molar absorptivity, concentration, and path length.