# 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

Code to add this calci to your website

#### Formula:

Absorbance = -Log_{10}(T)
**Where,**
T = Transmittance of the Material
### Example:

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

#### Solution:

Absorbance = -Log_{10}(T)

= - log_{10} (23)

= -1.3617