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Beer-Lambert Law (Absorbance)

Calculate absorbance, transmittance or concentration using the Beer-Lambert law.

Dr. Lena FischerVerified

PhD Chemistry (Analytical), MRSC

Analytical chemist with 12 years in pharmaceutical QA, spectroscopy, and solution chemistry. Passionate about making chemistry accessible.

Solve for

Molar absorptivity ε (L/mol·cm)

Path length l (cm)

Concentration c (mol/L)

Absorbance A (if solving for c or l)

Enter values above to see your result

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About the Beer-Lambert Law (Absorbance)

The Beer-Lambert law relates absorbance of light to the properties of the material: A = εlc, where ε is molar absorptivity, l is path length in cm, and c is concentration in mol/L.

How it works

A = \varepsilon \, l \, c

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