Spray Mix Calculator Guide
Use this garden spray mix calculator to scale concentrate into any sprayer size. Enter sprayer volume in gallons, the label mixing ratio, and unit (tsp, tbsp, oz, or ml per gallon) to get total concentrate to add before filling with water.
How to use the spray mix calculator
Enter your sprayer tank size in gallons, the concentrate rate from the product label, and select the ratio unit (teaspoons, tablespoons, ounces, or milliliters per gallon).
The result is total concentrate to measure into the tank before adding water to the fill line.
Spray dilution formula
Total concentrate = Sprayer volume (gallons) × Mixing ratio (per gallon). The unit you select (tsp, tbsp, oz, or ml) applies to the concentrate amount.
Always follow the product label rate — this calculator scales the label math to your tank size.
- Concentrate = gallons × rate per gallon
- 1 gallon = 3,785 ml
- 1 tablespoon = 3 teaspoons
- Fill tank half with water, add concentrate, agitate, then top off
Worked example
A 2-gallon pump sprayer with a label rate of 2 teaspoons of concentrate per gallon.
Total concentrate = 2 × 2 = 4 teaspoons. Add 4 tsp concentrate, agitate, then fill to 2 gallons with water.
Safe mixing practices
Wear gloves, eye protection, and long sleeves when handling concentrates. Mix outdoors or in a well-ventilated area. Never apply more than the label rate — higher concentration does not improve results and can burn foliage.
Sprayer calibration tips
Mark your sprayer fill line and verify gallon marks with a measuring cup. Clean the tank between different products to avoid harmful chemical reactions.
- Label rates differ for insects, fungi, and weeds — read carefully.
- See insecticidal soap and neem oil calculators for organic mixes.
- Apply in calm weather below 85°F when possible.
- Triple-rinse empty containers per local disposal rules.