Spray Application Rate Calculator (Quick Sprayer Calibration) | L/ha & gal/acre
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Spray Application Rate Calculator (Quick Sprayer Calibration)

Instantly calculate spray rate (L/ha / gal/acre) from speed, width, and flow.

Shows the difference from target and whether to adjust speed or flow. Pressure conversion is a reference only.

Input

Sistem unit

You can switch units anytime; values are auto-converted.

km/h

Measured value recommended: average speed at steady throttle

Calculate speed from distance and time

m

dtk

m

Enter effective spray width, not just boom width.

L/min

The easiest method is to measure 1-minute discharge in a graduated container.

L/min

If flow varies, measure a few nozzles and use the average.

Total flow：-

L/ha

Even without a target, current rate is calculated.

Hasil

Current spray rate
-
Ringkasan input
-

Difference from target

-
Target
-
Estimate underwriting change from rate updates
-
-

Adjustment guidance

Adjust by speed
-
-
Adjust by flow
-
-
-
Adjust by pressure (reference)

bar / psi

-

Flow is roughly proportional to the square root of pressure (rule of thumb)

Adjustment concept

To decrease rate: speed ↑ / flow ↓
To increase rate: speed ↓ / flow ↑
How to measure in the field (simple steps)
  1. Measure speed: drive a fixed distance at steady throttle and compute speed from time (or use average meter value).
  2. Check spray width: effective spray width (boom effective width or nozzle spacing × count).
  3. Measure flow (recommended): at normal working pressure, measure 1-minute discharge (total or average of several nozzles).
Formulas and units
  • Area/time = speed × width
  • Spray rate = flow ÷ (speed × width), converted to area units
L/ha = (600 × flow [L/min]) / (speed [km/h] × width [m])
gal/acre = (495 × flow [gal/min]) / (speed [mph] × width [ft])
Back-calc to meet target
Change speed only: speed_required = speed_current × (R / T)
Change flow only: flow_required = flow_current × (T / R)
pressure_required ≈ pressure_current × (flow_required/flow_current)^2

よくある質問

My units are mixed.
You can switch km/h or mph, m or ft, L/min or gal/min, and L/ha or gal/acre. Values are auto-converted.
I have multiple nozzles.
Choose “per nozzle × count” to auto-calculate total flow. If there is variation, measure a few nozzles and use the average.
Can I calculate flow from pressure?
We recommend measured flow because nozzle wear, differences, and conditions can cause significant error. Pressure conversion is shown as a reference only.

Catatan

  • This is a quick calibration tool. Use measured speed, width, and flow from the field.
  • Spray rate varies with nozzle wear, viscosity, filter clogging, pressure fluctuation, terrain, slip, etc.
  • Set target spray rate per label or instructions (crop, product, dilution).

Spray rate calculator (L/ha, gal/acre) / nozzle flow calculator / boom sprayer calibration