On Target Spray Calibration Calculator Provides an easy way to calibrate the spray volume of your On Target sprayer. If you need help with this form feel free to contact us at 503-996-1101 or email us at info@ontargetspray.com. 1. Enter some basic information about your On Target sprayerYou'll need something to measure water.Output Of Each Nozzle (ml/min)(Turn on Liquid Only and Measure at 1 Nozzle for 1 Minute)Total Number of NozzlesBoom Width (inches)Ground Speed (mph)2. Calculate your spray volume.By Acres or By Total Tank MixCalculate By Acres or By Total Tank MixBy AcresTotal Tank MixTotal Tank Mix Load (gallons)Total Acres SprayedAcres of Total Coverage Per Load (calculated)Gallons Per Acre Applied (calculated)Gallons of Mix Necessary for Target Acreage (calculated)