There are several variables to consider, but in general, for a 10-14 pound turkey, most people seem to use about 3 gallons of oil.
When melted, the 21.85 pound bucket of Bacon Up is roughly equivalent to 3 gallons of oil.
Note that the 9-pound pail of Bacon Up (which is available on Amazon and Walmart.com) is the equivalent of about 1.24 gallons.
(Federal regulations require us to sell bacon grease by WEIGHT, versus VOLUME.)
If your turkey and/or pot is larger, use this method to figure out how much Bacon Up to buy:
Put your turkey in your empty frying pot (still in its packaging is fine)
Cover it with water using a measuring cup to add the water — and count the number of cups it takes
Divide the # of cups by 16 to get the number of gallons
Multiply the # of gallons by 7.3 to convert to POUNDS (we are required to sell bacon grease by weight rather than volume) – THIS WILL TELL YOU HOW MANY POUNDS OF BACON GREASE YOU NEED
Before adding oil, be sure to completely dry the water out of the pot and also be certain the turkey is completely dry before adding it to hot oil