SprayMaster: Spray Calculator
SprayMaster is the fast, no-nonsense calculator for licensed pesticide applicators — ag, turf, ornamental, pest control, and right-of-way.
Version 1.1.0 Updated 2026-09-07 Requires iOS 17.0 Size 3 MB Price Free
What it does
Free
- Tank Mix — turn any label rate (per acre, per 1,000 ft², or per gallon) into exactly how much product goes in the tank, plus acres per tank and whole-job totals.
- Mix Ratio — quick dilution for handheld and backpack sprayers, with the equivalent percent solution.
Pro
- Sprayer Calibration — find your true gallons-per-acre by the nozzle & speed formula or the 1/128-acre catch method (the one on the cert exam).
- Rate Converter — lb/acre ↔ oz/1,000 ft², % ↔ oz/gal, and more.
- Area / Acreage — size a field from ground measurements.
- Calculation history, and no ads.
Questions people ask about SprayMaster
Does it come with product rates?
No, and it never will. The label is the law: you type the rate off the label in front of you and the app does the arithmetic. It ships no rates and makes no recommendations.
What can I do without paying?
Tank Mix and Mix Ratio. Turn any label rate — per acre, per 1,000 square feet or per gallon — into how much product goes in the tank, with acres per tank and the whole-job total, plus quick dilution for handheld and backpack sprayers.
Does it calibrate a sprayer?
Pro does, two ways: the nozzle-and-speed formula, or the 1/128-acre catch method — the one that turns up on the certification exam.
Can it convert between label units?
Pro converts lb per acre to oz per 1,000 square feet, percent solution to oz per gallon, and back, which is where most tank mistakes start.
Does it work in the field with no signal?
Yes. Every calculation runs on the phone, and Pro keeps a history so you can show what you mixed.
Who is it for?
Licensed applicators: ag, turf, ornamental, structural pest control and right-of-way. It does the maths; the label, its restrictions and your state's rules are still yours to follow.
What's new in 1.1.0
• Unit handling and rounding in the mix and calibration calculators, with tests behind them • A free trial is only offered to people who can still get one • Manage or cancel your subscription without leaving the app
Privacy and support
SprayMaster works offline and does not require an account. Read the privacy policy and the terms for this app, or write to us if something is wrong.