Spray Application Rate Agriculture Tools
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Spray Application Rate Calculator (Simple Sprayer Calibration)

Calculate the current spray rate in L/ha and gal/acre from travel speed, spray width, and flow.

Compare it with your target rate and see the adjustment needed through speed or flow.

Get spray rate from just three required inputs
See whether speed or flow should be changed
Unit switching, shareable links, and saved last values

Important safety notes

Always follow the product label, SDS, and sprayer manufacturer instructions.
This tool supports simple application-rate calibration. Measure speed, width, and flow in the field.
Pressure-based adjustment is reference-only. Re-measure actual flow after any change.

How to use

  1. Choose the unit system and enter travel speed, spray width, and flow.
  2. Use the helper fields to estimate speed from distance and time or width from nozzle spacing and count.
  3. Check the current spray rate, then enter a target rate to see the deviation and adjustment guidance.
  4. Copy the result or a shareable link for field use.

Sample

Example with over-application

Input Speed 6.0km/h, nozzle spacing 50cm × 24 = width 12.0m, total flow 14.8L/min, target 100L/ha

Output Current 123L/ha, deviation +23%, recommended 7.4km/h or 12.0L/min (0.50L/min per nozzle)

Field measurement steps

  1. Drive a fixed distance at a steady throttle and calculate speed from the elapsed time.
  2. Use the actual spray width rather than only the full boom width.
  3. Measure one-minute output under normal working conditions, then enter total flow or the average per nozzle.

Formulas and units

  • L/ha = (600 × flow[L/min]) ÷ (speed[km/h] × width[m])
  • gal/acre = (495 × flow[gal/min]) ÷ (speed[mph] × width[ft])
  • Required speed = current speed × (current rate ÷ target rate)
  • Required flow = current flow × (target rate ÷ current rate)
  • Required pressure ≈ current pressure × (required flow ÷ current flow)²
  • Measured speed: km/h = distance (m) ÷ time (s) × 3.6

FAQ

My units are mixed.

You can switch between km/h and mph, m and ft, L/min and gal/min, and L/ha and gal/acre at any time. Values are converted automatically.

I have multiple nozzles.

Choose per-nozzle flow × count to calculate total flow automatically. If nozzle output varies, measure several nozzles and enter their average.

Can I calculate flow from pressure?

Use measured flow as the main input. Pressure-based conversion is reference-only because nozzle wear and field conditions can change actual output.

Notes

  • This is a simple calibration tool; it assumes that speed, width, and flow are measured in the field.
  • Spray rate changes with nozzle wear, liquid viscosity, clogged filters, pressure fluctuation, terrain, and wheel slip.
  • Set the target rate from the label and official instructions for the crop, product, and dilution plan.