The Formulae for calculating application rates for

Spray boom/planter mounted sprayer  -imperial

nozzle output (gal/min) x 5940            
nozzle spacing (inches) x speed (mph)      = application rate (galls/acre)

Knapsack Sprayer - imperial

nozzle output (gal/min) x 5940       
swath width (inches) x speed (mph)         = application rate (galls/acre)

The information contained in this web site is intended as a guide only to the performance that might be expected when operating stated products in the conditions stated.