Calculation formula from L1C to L2A

I want to know the calculations that are done when converting L1C data to L2A data.

So I looked at the help of Sen2Cor, but the formula was not listed.

Please tell me where to see the formula.

It is not just a simple formula.
Here you find several documents which explain sen2cor:

Hello @bakeho

A breakdown of the L2A algorithm is given at



S2 MPC Operations Manager


Thank you for giving me an easy-to-understand explanation!