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Sprayer tank mix calculator

Getting a tank mix wrong is one of the more expensive mistakes in farming, and the arithmetic is where it usually goes wrong.

L/ha
L/ha
Product per full tank
37.500L
= Exact Spray mix
Total product needed
62.50
Total water
5000
Hectares per tank
15.000
Full tanks
1
Area left for the part tank
10.000
Product in the part tank
25.000
Water in the part tank
2000
Product concentration in the tank
1.2500 %
Show the working
  1. Area to spray = 25
  2. Product dose = 2.5
  3. Water volume = 200
  4. Tank capacity = 3000
  5. Total product needed = 2.5 * 25 = 62.5
  6. Total water = 200 * 25 = 5000
  7. Hectares per tank = 200 > 0 ? 3000 / 200 : 0 = 15
  8. Product per full tank = 15 * 2.5 = 37.5
  9. Full tanks = floor(25 / 15) = 1
  10. Area left for the part tank = 25 - 1 * 15 = 10
  11. Product in the part tank = 10 * 2.5 = 25
  12. Water in the part tank = 10 * 200 = 2000
  13. Product concentration in the tank = 3000 > 0 ? 37.5 / 3000 * 100 : 0 = 1.25

Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.

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    The formula

    • hectares per tank = tank capacity / water rate
    • product per tank = hectares per tank x dose

    Always follow the label rate and the statutory conditions. The label is a legal document, not a suggestion.

    Mixing a part tank at full concentration is the classic overdose. Work out the part-tank quantities separately.

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