Question: how many square feet does a gallon of thinset cover?
Answer: Average coverage: tile up to 6-by-6-Inch (3/16-by-5/32-Inch V-notch trowel) 40-5-Square-Feet per gallon; tile up to 12-by-12-Inch (1/4-by-1/4-by-1/4-Inch square notch trowel) 23-35-Square-Feet per gallon; for tile larger than 12-by-12-Inch (1/4-by-3/8-by-1/4-Inch square notch) 20-25-Square-Feet per gallon.