SprayMaster is a fast pesticide calculator for licensed applicators working in agriculture, turf, ornamentals, pest control and right-of-way. It does the arithmetic and nothing else, whether you need a herbicide calculator or a general tank mix calculator: you type the rate from the product label in front of you, and the app works out the rest. It ships no product rates and makes no recommendations, and it never will.

Tank Mix turns any label rate, whether per acre, per 1,000 square feet or per gallon, into exactly how much product goes in the tank. It also shows acres per tank and totals for the whole job. Mix Ratio gives a quick dilution for handheld and backpack sprayers, together with the equivalent percent solution.

The sprayer calibration calculator finds your true gallons per acre in two ways: the nozzle and speed formula, or the 1/128-acre catch method that turns up on the certification exam. The Rate Converter changes pounds per acre into ounces per 1,000 square feet, percent solution into ounces per gallon, and back again, which is where many tank mistakes start. Area and Acreage sizes a field from ground measurements, and calculation history keeps your earlier results.

Every calculation runs on the phone, so it works in the field without a signal.

The core app includes Tank Mix and Mix Ratio. The optional Pro upgrade adds sprayer calibration, the rate converter, area and acreage, and calculation history.

The label is the law. Follow the product label, its restrictions and your state's regulations.