Pre boil gravity 1.040 10 brix Post boil gravity 1.055 14 brix Final gravity 1.012 5.7% ABV
Based on boiling 7.50 gallonsliters at 1.040 for 60 minutes, this will decrease your wort by 1.00 gallonsliters, bringing your after boil OG to 1.045. You wanted an OG of 1.057. It looks like it will be under.