# Irradiance of a Surface Calculator

Posted by Dinesh onOnline **irradiance** radiometry calculator to calculate the radiant flux (power) received by a surface per unit area.

## Calculate Radiant Flux (power) Received by a Surface Per Unit Area

### Formula:

*E*_{e} = [(? • ?_{e}) / A]

? = the partial derivative symbol,

?

_{e}= radiant flux,

A = area,

*E*

_{e}= Irradiance of a surface