Calculator
Beer Lambert Law Calculator
This is a calculator to find a missing Beer Lambert Law equation value. The formula sets absorbance equal to extinction coefficient (molar absorptivity) in M-1 cm-1 multiplied by path length and concentration. This calculator can be used to find the amount light absorbed by the medium it is passing through.
| Extinction Coefficient | M-1 cm-1 | ||
| x | Path Length | ||
| x | Concentration | ||
| = | Absorbance |
Enter in three values and press "Calculate" and the fourth value will be calculated. For a database of common extinction coefficient values, click here
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This online tool may be cited as follows
MLA | "Quest Calculate™ Beer Lambert Law Calculator." AAT Bioquest, Inc., 30 Aug. 2025, https://www.aatbio.com/tools/quick-calculator/beer-lambert-formula-calculator. | |
APA | AAT Bioquest, Inc. (2025, August 30). Quest Calculate™ Beer Lambert Law Calculator. AAT Bioquest. https://www.aatbio.com/tools/quick-calculator/beer-lambert-formula-calculator. | |
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