Beer–Lambert Law Calculator
Calculate beer–lambert law with explicit inputs and a worked example.
Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Educational calculation using the stated ideal model. Inputs must describe the same system; not a dosing or laboratory procedure. Assumes linear absorbance response.
Example Calculation
- Molar absorptivity: 100 L/(mol·cm)
- Path length: 1 cm
- Concentration: 0.01 mol/L
ε=100, path 1 cm and concentration 0.01 M gives absorbance 1 and transmittance 10%.
Frequently asked questions
How do I use this calculator?
Enter molar absorptivity, path length, concentration. The result updates automatically. Use Reset to restore the example values.
What method does it use?
A = εlc; transmittance = 10^(−A). Educational calculation using the stated ideal model. Inputs must describe the same system; not a dosing or laboratory procedure. Assumes linear absorbance response.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.