# Absorbance Calculator

Absorbance is a dimensionless unit, which is also called as Decadic Absorbance. It is defined and expressed as the common logarithm of the ratio of incident to transmitted radiant power into a material. It is the measure of the capacity of a substance to observe the radiation. It is referred as optical density, as it is an induction of how much a material can stop the light. You can convert transmittance to absorbance using this online calculator.

## Convert Transmittance to Absorbance

Absorbance is a dimensionless unit, which is also called as Decadic Absorbance. It is defined and expressed as the common logarithm of the ratio of incident to transmitted radiant power into a material. It is the measure of the capacity of a substance to observe the radiation. It is referred as optical density, as it is an induction of how much a material can stop the light. You can convert transmittance to absorbance using this online calculator.

Code to add this calci to your website  #### Formula:

Absorbance = -Log10(T) Where, T = Transmittance of the Material

### Example:

If the transmittance of a material is 23, calculate absorbance?

#### Solution:

Absorbance = -Log10(T)
= - log10 (23)
= -1.3617