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768 teaspoons in a gallon. 3 teaspoons in a tablespoon. 16 tablespoons in a cup. 16 cups in a gallon. 3 * 16 * 16 = 768. Edit. Share to: Charlie N. 120,333 Contributions. I have spent many years renovating buildings and leading a commercial handyman crew.
Best Answer: 1 gallon is 128 oz, and you usually can get a good cup of tea of about 10 oz with one teabag, so approximately 12-13 teabags should do up a gallon nicely, one or two more if you like it really strong, and 3-4 more if you are adding ice to cool it.