How many acres 25 gallons will spray depends on application rate, which is gallons per acre or GPA, and nozzle type, pressure, and speed, but you can calculate it. Typical broadcast application rates for herbicides like glyphosate or 2,4-D for pasture weed control are 15 to 20 gallons per acre for good coverage, while some low-volume applications can be 10 GPA. At 15 GPA, 25 gallons will cover 25 divided by 15 equals about 1.66 acres. At 20 GPA, 25 gallons covers 25 divided by 20 equals 1.25 acres. At 10 GPA, 25 gallons covers 2.5 acres. If you are spot spraying with a wand targeting individual weeds rather than broadcast covering entire area, 25 gallons can cover much more, perhaps 5 to 10 acres of spot treatment because you are not wetting all ground. Calibration is important: to know exact coverage, measure how many gallons you use to spray a known area like 1000 square feet, then extrapolate. For example, if you use 1 gallon to cover 2000 square feet, 25 gallons covers 50,000 square feet, which is about 1.15 acres. So 25 gallons typically covers 1 to 2 acres broadcast and up to 5 to 10 acres spot spraying.
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