Based on boiling 4.00 gallonsliters at 1.040 for 60 minutes, this will decrease your wort by 1.00 gallonsliters, bringing your after boil OG to 1.050. You wanted an OG of 1.057. It looks like it will be under.
carb is awsome, head is perfect and lasts for the whole glass. sad i only have 3 gallons. will have to make again with a 5 gallon!!
bottled at 40* using 47 grams of dextrose (not sure if that will mess up the carb)
1.014 on 5.4.15