Stop Burning Your Lawn & Wasting Chemicals
Mixing herbicides by guessing or "eyeballing" it is the fastest way to ruin a lawn, contaminate soil, or waste expensive chemicals. If your mix is too weak, the weeds won't die and you will have to spray again. If your mix is too strong, you risk "burning" the top of the weed before the chemical can reach the root system, causing the weed to grow back weeks later.
This calculator is built for DIY homeowners and landscaping professionals using standard 1-gallon, 2-gallon pump sprayers, or 4-gallon backpack sprayers.
How to Use the Sprayer Mix Calculator
- Step 1: Enter the size of your sprayer tank in gallons (e.g., 2 Gallons).
- Step 2: Select the chemical you are using from the dropdown list. We have pre-loaded the most common DIY and commercial weed killers like 41% Glyphosate and 2,4-D Amine.
- Step 3: If your chemical isn't listed, select "Custom Rate" and input the fluid ounces per gallon specified on your product's label.
- Step 4: The dashboard will instantly output the exact fluid ounces you need to measure into your measuring cup. Pour it into your tank, fill the rest with water, and gently agitate.
What About Surfactants and Dye?
Many professional herbicides (like pure 41% Glyphosate or Tenacity) do not stick to waxy weed leaves on their own. You will often need to add a Non-Ionic Surfactant (a soap-like sticker) to the tank.
- Surfactant Mix Rate: The standard rate is usually 0.5 fluid ounces (1 Tablespoon) per gallon of water.
- Marking Dye: If you are adding blue marking dye so you can see where you've sprayed, you typically need 0.5 to 1 fluid ounce per gallon.
Frequently Asked Questions
How many ounces of 41% Glyphosate per gallon of water?
For a standard 2% solution (which kills most general weeds and grasses), you should mix 2.5 fluid ounces of generic 41% Glyphosate (like Ranger Pro) per 1 gallon of water. For tougher, woody brush, a 3% to 5% solution (3.8 to 6.5 oz per gallon) may be required.
How much 2,4-D Amine per gallon of water?
For typical broadleaf weed control in lawns (like dandelions and clover), the standard mix rate is 1.25 to 1.5 fluid ounces of 2,4-D per 1 gallon of water. Always check your specific product label as concentrations can vary based on the manufacturer.
