Drone Spray Application Rate Calculator

Catch test: run the pump at working pressure for a timed minute with nozzles discharging into containers, measure total volume, and compare against the flow you entered here. Then fly a measured strip at working speed and confirm tank drawdown matches the predicted L/ha. Drone ULV rates leave little error margin, so the calculate-then-verify loop is the professional standard before every product change.

The deposition-tested width, not the visual spray width: downwash patterns vary with height, speed and payload weight, and effective swath is where deposition stays even between passes — typically determined with water-sensitive paper across a test pass. Common working figures run 4-7 m for mid-size spray drones at 2.5-3.5 m height, but YOUR configuration's tested number is the one that belongs in this calculator.

Because flow is per-minute while coverage is per-hectare: at fixed flow, doubling speed halves the liquid landing on each hectare. The formula makes the relationship explicit — rate is inversely proportional to speed — which is also the field fix: if the rate reads high against the label, speed up or throttle flow; if low, slow down. Flow-control systems automate this; the arithmetic stays the same.

No account and no connection are needed once the page has loaded — records live in local storage on your device and every calculation runs in your browser. Data doesn't sync between devices, so export the CSV when you want to move or archive your records.

Yes — one click exports your complete calibration record as a CSV file that opens in Excel, Google Sheets or Numbers. The export preserves every column exactly as entered, so you can print it, attach it to paperwork, or hand it to an inspector, buyer or insurance underwriter as a supporting summary alongside your official records.