It is difficult to estimate. The label still wants you to estimate the rate you spray on 1000 sqft as if broadcast in pints per acre. Pages 2-3 have instructions for spot treatment. Example: for 2pt/acre treatment .... 2pt/acre is equal to 3/4oz per 1000sqft. If you will spray 1 gal per 1000/sq ft, add 3/4oz per gal. Problem is, there is no way to know how much of any mix each person is going to hand spray down on any area. % in the tank does not indicate how much herbicide is used per sqft or per acre.