Beer-Lambert Law Calculator

How to use the Beer-Lambert law calculator

1. Choose what to calculate: absorbance, concentration, path length or molar extinction coefficient.
2. Type the other three values. The path length is usually 1 cm.
3. The answer appears with the transmittance.

Frequently asked questions

When does the law stop working?

At high absorbance, usually above about 1 to 2, where too little light reaches the detector. Dilute the sample and multiply back.