PestKeen

Pesticide Mix Calculator

Stop guessing. Convert label rates (like 1.5 oz per gallon) to exact mix amounts for your backpack or handheld sprayer.

Mix Ratio

per gallon

Enter the amount the label says to mix per 1 gallon of water.
(e.g. "1.5 fl oz per gallon")

Add Concentrate Amount

1.50oz
3.0
tbsp
44
ml
9.0
tsp

Fill tank with water to the 1 gal line.

Always wear gloves and eye protection. Add half the water first, then the chemical, then the rest of the water to reduce foaming.

Common Mix Rates Table

Label Rate Per 1 Gallon Per 4 Gallons (Backpack)
1% Solution 1.28 oz 5.12 oz
0.5 oz / gal 1 tbsp 2 oz
1.5 oz / gal 3 tbsp 6 oz

Mixing Safety Tips

  • Read the Label: The label is the law. Deviating from the rates is a federal offense in many regions.
  • Order of Operations: 1/2 Water -> Chemical -> Agitate -> Remaining Water.
  • Triple Rinse: When measuring cups are empty, rinse them 3 times into the tank, not down the drain.