Garden Pesticide Dilution Calculator
Turn a label mix rate (fluid ounces per gallon) and your sprayer size into the exact concentrate to add, plus how many tanks cover your yard.
How it works
Concentrate per tank = rate × tank gallons · Total = rate × (area ÷ coverage) · Tanks = ⌈area ÷ coverage⌉
Pesticide and herbicide labels give a mix rate in product per gallon of water, so a tank needs that rate times its size in gallons. The label rate is a legal maximum for a reason — over-concentrating wastes product, can scorch plants, and increases runoff and residue without improving control. Measure carefully, mix only what you will use, spray in calm, dry conditions, and wear the protective gear the label specifies.
Worked example
At a label rate of 2 fl oz per gallon in a 1-gallon sprayer, add 2 fl oz of product (about 4 tablespoons) to make 1 gallon. Treating 1,000 sq ft at 1,000 sq ft per tank is a single tank, so 2 fl oz total.
Frequently asked questions
Is a stronger mix more effective?
No. The label rate is calibrated for control, and exceeding it can burn plants, leave illegal residue and harm beneficial insects — without killing pests any faster. More is not better with pesticides.
How much finished spray do I actually need?
Match the tank coverage to your area. Spray to the point of light, even wetting rather than runoff; mixing far more than you can apply means disposing of leftover chemical, which the label restricts.
When is the best time to spray?
Spray in calm, dry weather when rain is not expected for the interval on the label, and avoid the heat of midday and times when pollinators are active. Wind causes drift onto plants and areas you did not intend to treat.
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General guidance only — always follow the product label, which is the law, and wear the specified protective equipment.