PKa shows how strong the acid in a certain compound is. You will be able to tell if the acid is strong based on how high or how low the pKa is. More acidic compounds usually have a low pKa. Some people become confused with pKa and pH because they both deal with acids but there are some differences that are available.
The pKa will measure the strength of the acid in a solution or a compound while pH will determine if a compound is acidic, basic or neutral. It will not be possible to convert pKa to pH and vice versa because they measure two different aspects of acid.
