3rd all grain/partial batch, trying to do a partial mash IIPA. Went for a low mash temp (149), hit it pretty right on, but lost more degrees than expected over the 90 minute mash. It finished between 142-146 depending on what part of the pot I measured, so I was already worried about low conversion (I don't have any iodine to test with).
But then I went and spilled probably about 1/2-3/4 gal of the mash water (sparge water wouldn't have been as bad). Great...
So I went and combined and I'm bringing it to a boil anyway. I've got some extra LDME on hand that I can throw in to bring up the gravity, but I'd like to calculate how much to add. My recipe already called for 3 lbs LDME and 1 lb dextrose to be added. Can someone help me calculate how much extra LDME I need to bring the boil up to around 1.075 - 1.080 at 6.5 gallons (OG after evaporation around 1.090 @ 5.25 gal)?
Measured gravity at 145*, 6.5gal (without the 3lbs LDME and 1 lb dextrose already planned) is 1.020, I have no idea how many points to add for the 145*, nor how much this will go up when I add the planned LDME and dextrose... help?