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THE FEUTEX TOOLKIT

Beer–Lambert Absorbance

Calculate absorbance and transmission from concentration, optical path and molar absorptivity.

Chemistry workspace● Runs in your browser
01 Your input
02 Your result
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FormulaAbsorbance = epsilon*concentration*path; Transmission = 100*10**(-epsilon*concentration*path)

Worked example

Inputs

Molar absorptivity
100 L/(mol·cm)
Concentration
0.01 mol/L
Optical path length
1 cm

Expected results

Absorbance
1
Transmission
10 %

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Calculate absorbance and transmission from concentration, optical path and molar absorptivity.
  2. Set molar absorptivity, concentration, optical path length in the indicated units.
  3. Calculate and compare absorbance, transmission.

Try this example

{
  "epsilon": 100,
  "concentration": 0.01,
  "path": 1
}

Accuracy and scope

Assumes a homogeneous dilute sample, monochromatic light and negligible scattering. No calibration or instrument correction.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.