Enter the absorbance and molar concentration into the calculator to determine the molar extinction coefficient.

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## Extinction Coefficient Formula

The following equation can be used to calculate a molar extinction coefficient.

E = A / mc

- Where E is the extinction coefficient
- A is the absorbance
- mc is the molar concentration

## Extinction Coefficient Definition

The extinction coefficient is defined as the ratio of absorbance to the molar concentration of a solution.

## Extinction Coefficient Example

How to calculate an extinction coefficient?

**First, determine the absorbance.**Calculate the absorbance of the solution.

**Next, determine the molar concentration.**Calculate the molar concentration of the substance.

**Finally, calculate the extinction coefficient.**Calculate the coefficient of extinction using the equation above.

## FAQ

**What is an extinction coefficient?**

An extinction coefficient is a measure of a chemical’s ability to absorb light at a given wavelength.

**What is absorbance?**

Similarly, absorbance is also another measure of the substance’s ability to absorb light.