There are 256 US tablespoons in a US fluid gallon and 256 imperial tablespoons in an imperial gallon.
1 Gallon = 256 Tablespoons [Fluid US or UK]
1 Gallon [Dry] = 297.893681 Tablespoons [Dry]
Gallon is an imperial and US Customary volume unit. There is one type of gallon in imperial system and 2 types (liquid and dry) in US Customary system. The abbreviation is "gal".
Tablespoon is a frequently used volume unit in cooking recipes. The abbreviations are "tbsp", "tbs".