Pesticide Rate Calculator – L/ha & gal/acre

Labels state dose three ways — product per area (L/ha), product per water (mL/L) or active ingredient per area — and the calculator moves between them. Worked example: a 480 g/L insecticide labeled 1.2 L/ha on 35 ha: product = 42 L; active ingredient = 42 × 480 g = 20.16 kg. Through a knapsack at 150 L/ha, each 16 L tank covers 0.1067 ha and carries 128 mL of product. In imperial: 1.2 L/ha ÷ 2.471 = 0.485 L/acre ≈ 16.4 fl oz/acre, so 40 acres take 19.4 US gal of product. Always re-check the rate against the label book — wrong units are the classic over-application.

1. 1

   Step 1

   Enter the label rate: L/ha, mL/L water, or fl oz/acre.

2. 2

   Step 2

   Enter the area to treat (or tank volume and sprayer output).

3. 3

   Step 3

   Read total product and per-tank dose.

4. 4

   Step 4

   Check the active-ingredient totals for records.

• 1

  Read the label twice: product rate AND water volume

• 2

  Calibrate annually; nozzle wear raises output 10–20%

• 3

  Record batch numbers with every tank

• 4

  Triple-rinse containers, return where schemes exist

• Reading g/L concentrate strength as the field rate

• Doubling “for bad pests” — illegal and resistance-forming

• Mixing rates per liter with rates per hectare

• Ignoring the label’s water volume window for contact chemicals