The quality of a conference can be obtained from different metrics/sources:

For instance you can check the CORE ranking http://portal.core.edu.au/conf-ranks/, which ranks conferences in A,B,C. (A is better).

The acceptance rate of a conference (i.e. the ratio of papers accepted divided by papers submitted) can also give you an idea.

For journals, people usually use the Impact Factor (IF), the higher the better.

Hope it helps :)

Hello Marc. ACM group is not providing any metrics for journal. How can we find quality metrics for it?

Hi Jay,

  Actually the Impact Factor (IF) is provided by Thomson Reuters by means of the Journal Citations Report (JCR).  Most of ACM journals are indexed there, and they have an impact factor computed. The impact factor varies from field to field. Hence it is important to compare Impact Factors from journals of the same field. You can google impact factor of a specific journal and you will probably find it :). (e.g. the Impact factor of ACM TOSEM is 1.17 for year 2015 https://www.researchgate.net/journal/1049-331X_ACM_Transactions_on_Software_Engineering_and_Methodology)

Thank you Marc