Chemistry
Beer-Lambert Law Calculator
Beer-Lambert Law Calculator calculate absorbance, transmittance, and absorbed-light percentage from molar absorptivity, path length, and concentration.
Chemistry
Beer-Lambert Law Calculator
Calculate absorbance, transmittance, and absorbed-light percentage from molar absorptivity, path length, and concentration.
Formula
Absorbance A = molar absorptivity x path length x concentration; transmittance = 10^-A.
About the Beer-Lambert Law Calculator
Calculate absorbance, transmittance, and absorbed-light percentage from molar absorptivity, path length, and concentration.
How the Beer-Lambert Law Calculator Works
The three Beer-Lambert factors are multiplied in coherent units and the logarithmic absorbance is converted to a linear transmittance fraction.
Formula
Absorbance A = molar absorptivity x path length x concentration; transmittance = 10^-A.
The calculation runs in your browser. Values are validated for required ranges, compatible units, and method-specific restrictions before results are displayed.
Required Inputs
- Molar absorptivity (required) - enter in L/(mol cm).
- Optical path length (required) - enter in cm.
- Concentration (required) - enter in mol/L.
Results Reported
The result panel reports the final answer and the intermediate quantities needed to check the calculation:
- Absorbance
- Transmittance (%)
- Light not transmitted (%)
- Optical density
Beer-Lambert Law Calculator Example
Select Example Data in the calculator to load this reproducible input set:
| Input | Example value |
|---|---|
| Molar absorptivity | 15000 L/(mol cm) |
| Optical path length | 1 cm |
| Concentration | 0.0001 mol/L |
How to Use the Calculator
- Confirm that the calculator title and formula match the quantity you need.
- Enter every required value using the unit shown with its field.
- Select Example Data to inspect a valid input set, or enter your own values and select Calculate.
- Review all reported values and the displayed formula before using the answer.
- Use Copy Result or Download CSV when you need a reusable record.
Accuracy and Limitations
The relation assumes monochromatic light, a homogeneous sample, suitable concentration, and negligible scattering or chemical interaction. Blank correction may be required.
Keep units consistent, use measurements that represent the actual situation, retain full precision during the calculation, and round only the final answer. Professional decisions may require current official rules, field measurements, laboratory methods, or specialist review.
Frequently Asked Questions
What does the Beer-Lambert Law Calculator calculate?
Calculate absorbance, transmittance, and absorbed-light percentage from molar absorptivity, path length, and concentration.
Which formula does the Beer-Lambert Law Calculator use?
Absorbance A = molar absorptivity x path length x concentration; transmittance = 10^-A. The three Beer-Lambert factors are multiplied in coherent units and the logarithmic absorbance is converted to a linear transmittance fraction.
What should I check before using the Beer-Lambert Law Calculator result?
The relation assumes monochromatic light, a homogeneous sample, suitable concentration, and negligible scattering or chemical interaction. Blank correction may be required.