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Pesticide Dilution & Mixing Chart

Free printable pesticide dilution chart: 1:32/1:64/1:128 ratios to oz per gallon, a percent-solution strip, small-batch fills for 32-oz/2.5-gal/backpack sprayers, and a mixing-order banner.

Chart edition
Pick the card you carry

Pick the chart you carry — the ratio card, the percent field card, or the hose-end/RTU card. Each is a fixed printable sheet; switching just swaps the sheet, nothing is computed or saved.

How to read it
How these conversions work

Two fixed identities, nothing computed live. For a ratio, oz of concentrate per gallon = 128 ÷ N (so 1:32 → 4 oz, 1:64 → 2 oz, 1:128 → 1 oz). For a percent label, oz per gallon = % × 1.28 (so 2% → 2.56 oz, 2.5% → 3.2 oz). The small-batch columns divide the per-gallon figure by 4 for a 32-oz bottle and multiply by 2.5 and 4 for the larger tanks; to scale any mix, multiply the per-gallon amount by the number of gallons.

Numbers are rounded for field use and the strong ratios (1:8 and below) are approximate. The figures come from Fulton Distributing's ratio chart and The Nature Conservancy's percent matrix, with the `% × 1.28` rule confirmed by Pesticide Environmental Stewardship and Online Pest Control Courses.

Switch the edition to preview a different card. The sheet is a static printed lookup — print landscape and laminate it for the truck.

Pesticide Dilution & Mixing Reference Chart

Quick-reference conversions — always read and follow the product label; the label rate governs.

Mixing order

  1. Fill the tank ~⅓–½ with clean water
  2. Add the measured concentrate
  3. Top off with water
  4. Agitate

Add concentrate TO the water — it counts toward final volume; never the reverse.

Ratio → ounces of concentrate per gallon

Approximate — the label rate governs. 1:N means 1 part concentrate to N parts water. US gallon (128 fl oz) basis.

Ratio Oz / 1 gal 32-oz bottle 2.5 gal 4-gal backpack ≈ %
1:8 16 oz 4 oz 40 oz 64 oz ~11%
1:16 8 oz 2 oz 20 oz 32 oz ~6%
1:32 4 oz 1 oz 10 oz 16 oz ~3%
1:64 2 oz 0.5 oz ≈ 1 tbsp 5 oz 8 oz ~1.5%
1:128 1 oz 0.25 oz ≈ 1.5 tsp 2.5 oz 4 oz ~0.8%
1:256 0.5 oz ~0.125 oz ≈ ¾ tsp 1.25 oz 2 oz ~0.4%

1:8 · 16 oz / gal (~11%)

32-oz: 4 oz · 2.5 gal: 40 oz · backpack: 64 oz

1:16 · 8 oz / gal (~6%)

32-oz: 2 oz · 2.5 gal: 20 oz · backpack: 32 oz

1:32 · 4 oz / gal (~3%)

32-oz: 1 oz · 2.5 gal: 10 oz · backpack: 16 oz

1:64 · 2 oz / gal (~1.5%)

32-oz: 0.5 oz ≈ 1 tbsp · 2.5 gal: 5 oz · backpack: 8 oz

1:128 · 1 oz / gal (~0.8%)

32-oz: 0.25 oz ≈ 1.5 tsp · 2.5 gal: 2.5 oz · backpack: 4 oz

1:256 · 0.5 oz / gal (~0.4%)

32-oz: ~0.125 oz ≈ ¾ tsp · 2.5 gal: 1.25 oz · backpack: 2 oz

Percent → ounces of concentrate per gallon

oz per gallon = % × 1.28. Approximate — the label rate governs.

Label % Oz / 1 gal 2.5 gal 25 gal 50 gal
0.5% 0.6 oz 1.5 oz 15 oz 30 oz
1% 1.3 oz 3.25 oz 32.5 oz 65 oz
2% 2.56 (≈2.6) oz 6.4 oz 64 oz 128 oz
2.5% 3.2 oz 8 oz 80 oz 160 oz
3% 3.8 oz 9.5 oz 95 oz 190 oz
5% 6.4 oz 16 oz 160 oz 320 oz
10% 12.8 oz 32 oz 320 oz 640 oz

0.5% · 0.6 oz / gal

2.5 gal: 1.5 oz · 25 gal: 15 oz · 50 gal: 30 oz

1% · 1.3 oz / gal

2.5 gal: 3.25 oz · 25 gal: 32.5 oz · 50 gal: 65 oz

2% · 2.56 (≈2.6) oz / gal

2.5 gal: 6.4 oz · 25 gal: 64 oz · 50 gal: 128 oz

2.5% · 3.2 oz / gal

2.5 gal: 8 oz · 25 gal: 80 oz · 50 gal: 160 oz

3% · 3.8 oz / gal

2.5 gal: 9.5 oz · 25 gal: 95 oz · 50 gal: 190 oz

5% · 6.4 oz / gal

2.5 gal: 16 oz · 25 gal: 160 oz · 50 gal: 320 oz

10% · 12.8 oz / gal

2.5 gal: 32 oz · 25 gal: 320 oz · 50 gal: 640 oz

Volume equivalence & scaling

  • 128 oz = 1 gal = 4 qt = 8 pt = 16 cups
  • 3 tsp = 1 tbsp = 15 mL
  • 1 fl oz = 2 tbsp = 30 mL
  • 1 gal = 3.8 L

Multiply the per-gallon amount by the number of gallons.

Add one product at a time; mix only what you’ll use; wear label-required PPE.

1:N means 1 part concentrate to N parts water. US gallon (128 fl oz) basis. Approximate — the label rate governs.

Shop / operator: ______________________________

Quick-reference conversions only. Always read and follow the product label — the label rate and PPE requirements govern. Not a substitute for the label and not a compliance/regulatory document.

Print or save

Sources

  1. Dilution Ratio Chart (PDF). Fulton Distributing. Retrieved .
  2. Mixing Chart for Liquid Herbicides (PDF). The Nature Conservancy. Retrieved .
  3. Calibration — Doing the Math. Pesticide Environmental Stewardship. Retrieved .
  4. How to Calculate Pesticide Dilution Ratios. Online Pest Control Courses. Retrieved .

How we choose and check our formulas

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