Large Calculations

I have a mySQL database holding baseball stats and I want to calculate rankings on these players. Now I'd obviously want this to be as fast as possible since I go through about 600 players but where is it best to make them? In the SQL command itself or in PHP? players need to have at least 100 at bats for this formula to work for them. There are 6 steps. 1. batting average x .05 2. doubles + triples + HR divided by at bats 3. runs scored divided by at bats 4. rbi's divided by at bats 5. stolen bases divided by at bats next add up the 5 totals then multiply that total by 200. It's a bse 100 system. a rating over 100 is very good. Jeff