OUCH!! I’m sorry to hear… On to efficiency. I do mine as a simple how much grist, and how much finished product you’ll have. The sweet fermentable has a points per pound value. Just a simple follow along here, and thats how I like to keep it… SIMPLE!.. I want 5 gallons of brew… I will use 12 pounds of barley, pale malt. The pale malt has a potential (points per pound) of 1.037… So, multiply 37,( you don’t need to clutter up your equation with 1.0… ) times 12 (your total pounds of barley)… You get 444. … Now lets divide that by your desired finished product of 5 gallons… you get… 88.8… That is what the gravity would be at 100% extraction… I know my system is 70% efficiency… I will take the number 88.8 and multiply by .7 (which is 70%)… I end up with 62.16… ( scrap the .16) Now you can put the 1.0 infront of the number 62… 1.062!!!.. not hard to figure, and once you get the hang of it, you will be able to adjust your grain bill to match the ABV you want!.. Let us know if this works for you! Sneezles61