Agriculture, Soil, Fertilizer & Farm Operations worked example

Sprayer Calibration with nozzle output at operating pressure of 0.63 gal / min: a worked example

What does the result look like when nozzle output at operating pressure reaches 0.63 gal / min? The full calculation is worked below with real intermediate numbers. Use it to check boom sprayer calibration before applying crop protection products or foliar nutrients.

The inputs for this scenario

  • Nozzle output at operating pressure: 0.63 gal / min (raised for this scenario; the documented default is 0.25)
  • Ground speed times nozzle spacing: 120 mph x inches (unchanged)
  • Boom sprayer 5940 constant: 5,940 x (unchanged)

Working through the calculation

  • Applying the documented formula (Spray volume = nozzle GPM / (ground speed MPH x nozzle spacing inches) x 5940) to the inputs above produces each figure below.
  • At this operating point the engine returns 31.19 gal / acre for spray volume per acre, the number this scenario is built around.
  • At this operating point the engine returns 0.01 value for uncalibrated flow ratio.
  • At this operating point the engine returns 5,940 x for 5940 calibration factor.
  • At this operating point the engine returns 120 value for speed and spacing product.

How this compares with the baseline

  • Against the tool's baseline example, where nozzle output at operating pressure sits at 0.25 gal / min and the headline result is 12.38 gal / acre, this scenario comes in 152% above the baseline at 31.19 gal / acre.
  • A figure at this level is achievable when nozzle output at operating pressure is genuinely sustained, not just peaked for a shift. It assumes uniform nozzle output across the boom; a single plugged or worn tip means the boom average differs from this single-nozzle calculation.

Results at a glance

  • Spray volume per acre: 31.19 gal / acre (headline result)
  • Uncalibrated flow ratio: 0.01 value
  • 5940 calibration factor: 5,940 x
  • Speed and spacing product: 120 value

Run it with your numbers

  • Every input above is editable in the live Sprayer Calibration calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.