1,000 Sq Ft Spot Spray Mix Calculator
Mix the right amount of herbicide for a 1,000 square foot spot treatment from a per-acre label rate, with the exact product and carrier volumes.
How This Calculation Works
One thousand square feet is 0.023 acre, since there are 43,560 square feet in an acre. Product for the spot equals the ounces-per-acre rate times 0.023, and carrier is the calibrated GPA times 0.023. Working in acres keeps the label rate unchanged and avoids a separate small-area formula.
Field Calibration & Rate Reference Chart
| Ground speed | Nozzle pressure | Typical GPA | Droplet class |
|---|---|---|---|
| 4 mph | 20 psi | 12 | Coarse |
| 5 mph | 25 psi | 14 | Coarse |
| 6 mph | 30 psi | 15 | Medium |
| 7 mph | 35 psi | 16 | Medium |
| 8 mph | 40 psi | 18 | Medium |
| 9 mph | 45 psi | 19 | Fine |
| 10 mph | 50 psi | 20 | Fine |
| 12 mph | 55 psi | 22 | Fine |
| 14 mph | 60 psi | 24 | Very fine |
| 16 mph | 65 psi | 26 | Very fine |
Common Questions
How many acres is 1,000 square feet?
One thousand square feet is about 0.023 acre, because one acre is 43,560 square feet. Dividing 1,000 by 43,560 gives the exact figure. Keeping the label rate per acre and scaling by 0.023 avoids conversion mistakes.
How much herbicide do I mix for a small spot spray?
Multiply the ounces-per-acre rate by 0.023 to get the product for 1,000 square feet. A 32 ounce-per-acre rate needs about 0.74 ounce for that area. Add the matching carrier volume from your calibrated GPA.
Should I use a percentage solution for spot spraying?
Many spot treatments are mixed as a percentage solution, such as 2 percent glyphosate, rather than a per-acre rate. Convert the label rate to a concentration when the job is small and scattered. For larger blocks, the per-acre method is more accurate.
How do I avoid over-spraying small areas?
Calibrate the sprayer to a known GPA, then treat only the measured area and stop when the calculated volume is used. Mark the treated patch and check it later. Over-application on small areas is easy to miss and can injure desirable plants.