Chemical Application Rate (GPA)

GPA = (5940 * GPM) / (speed * spacing) and inverse for target GPA.

Run the calculator

Formula and source

GPA = (5940 × GPM) / (speed_mph × spacing_in). The constant 5940 = 60 min/hr × 43 560 ft²/acre / (12 in/ft × ?)... derives from unit reconciliation.

ASABE EP367 (Guide for Preparing Field Sprayer Calibration Procedures) by name; manufacturer sprayer-calibration guides (John Deere, AGCO, Case IH) by name.

Audience

This tile is built for agriculture and the adjacent professions in the Agriculture and Forestry group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

Related tools

Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.