Chart · 2 minute read

Backpack sprayer mix chart

Your label gives ounces per gallon. Your backpack holds 1 to 4 gallons. This chart does the multiplication for the common rates, with small amounts in teaspoons and mL.

The label is the law. This page only does the arithmetic. Rates, target pests, sites, PPE, and reentry intervals always come from the product label and your state's rules.

Backpack sprayer mix chart (fl oz of product)

Find your label rate on the left and your tank size across the top. Fill the tank partway with water, add the product, then top off to the line.

Label rate1 gal2 gal3 gal4 gal
0.25 oz/gal0.25 fl oz0.5 fl oz0.75 fl oz1 fl oz
0.5 oz/gal0.5 fl oz1 fl oz1.5 fl oz2 fl oz
0.75 oz/gal0.75 fl oz1.5 fl oz2.25 fl oz3 fl oz
1 oz/gal1 fl oz2 fl oz3 fl oz4 fl oz
1.5 oz/gal1.5 fl oz3 fl oz4.5 fl oz6 fl oz
2 oz/gal2 fl oz4 fl oz6 fl oz8 fl oz
3 oz/gal3 fl oz6 fl oz9 fl oz12 fl oz
4 oz/gal4 fl oz8 fl oz12 fl oz16 fl oz
6 oz/gal6 fl oz12 fl oz18 fl oz24 fl oz
8 oz/gal8 fl oz16 fl oz24 fl oz32 fl oz

product = label rate × gallons mixed

Any other rate or tank size: open the calculator →

Small amounts in teaspoons, tablespoons and mL (per gallon)

Measuring under an ounce with a cup is guesswork. 1 fl oz = 6 tsp = 2 Tbsp = 29.57 mL.

Label rateTeaspoonsTablespoonsMilliliters
0.25 oz/gal1.5 tsp0.5 Tbsp7.39 mL
0.5 oz/gal3 tsp1 Tbsp14.79 mL
0.75 oz/gal4.5 tsp1.5 Tbsp22.18 mL
1 oz/gal6 tsp2 Tbsp29.57 mL
1.5 oz/gal9 tsp3 Tbsp44.36 mL
2 oz/gal12 tsp4 Tbsp59.14 mL

Common mistakes with backpack sprayers

  1. Using the tank's capacity instead of what you mixed. Two gallons in a 4 gallon backpack gets the 2 gallon amount.
  2. Per-1,000 sq ft labels. Those rates are not per gallon. Convert with your spray volume first: oz per 1,000 sq ft to oz per gallon.
  3. Dry products. Dry ounces are weight. Use a scale, not a measuring cup.

Frequently asked

How much product goes in a 4 gallon backpack sprayer?

Multiply the label rate in ounces per gallon by 4. A 1.5 oz per gallon rate is 6 fl oz in a 4 gallon backpack, a 2 oz per gallon rate is 8 fl oz.

How many ounces per gallon for a 2 gallon sprayer?

Double the per-gallon label rate. A 1 oz per gallon rate is 2 fl oz in 2 gallons.

How many teaspoons is 1 ounce?

One fluid ounce is 6 teaspoons or 2 tablespoons, about 29.6 mL.

More: How to calculate spray mix rates · Backpack sprayer mix chart · Soft wash mix ratio · oz per 1,000 sq ft to oz per gallon

Do the math on your phone, offline

The Spray Mix & Tank Calculator app has all three modes, tank presets, saved products with barcode scan, and a spray log for your records.

Download on the App Store