Spray Mix Calculators Ratio to Ounces Calculator

Ounces Per Gallon Calculator: Ratio to Oz Converter

Find the exact ounces per gallon for any mixing ratio — 1:16 (8 oz/gal), 1:32 (4 oz/gal), 1:64 (2 oz/gal), or any custom ratio. Enter your tank size to get fl oz, mL, tbsp, and tsp. Works for any sprayer volume.

Looking for the general tool? Use the Spray Mix Calculator · Prefer oz/gal inputs? Oz Per Gallon Calculator · Want a printable table? Mixing Chart · Full reference: Oz Per Gallon Guide · Hose-end sprayer? Dial N Spray settings.

Calculator

Convert Ratio → Ounces of Concentrate

Enter your final spray volume and ratio. The calculator returns the exact concentrate amount in fl oz (plus mL, tbsp, and tsp) and the water amount to fill the tank.

For small amounts (under 4 oz), a measuring syringe is more accurate than a kitchen spoon. For larger volumes, use a graduated cylinder.

How to convert a ratio to ounces

  1. Choose container units: Select US (gal / fl oz) or Metric (L / mL).
  2. Enter final spray volume: Type the total amount you want to mix and choose the unit.
  3. Select the ratio format: Choose Concentrate:Water (1:X) or Water:Concentrate (X:1) to match the label.
  4. Enter the ratio value (X): For 1:32 enter 32. For 64:1 (water:concentrate) enter 64 in X:1 mode.
  5. Read the results: Measure the concentrate (fl oz + mL + tbsp/tsp) and add water to reach final volume.

If your label gives oz per gallon instead of a ratio, use Oz Per Gallon Calculator.

Common ratios to ounces per gallon

Quick reference for a 1 gallon sprayer. For any other tank size, use the calculator above.

Mixing ratio Oz per gallon Metric (mL/L) Common use
1:8 14.22 fl oz 111 mL Heavy-duty cleaners, disinfectants
1:16 7.53 fl oz (≈ 8 oz) 59 mL Concentrated cleaners, strong herbicides
1:32 3.88 fl oz (≈ 4 oz) 30 mL Standard pesticide and herbicide rates
1:64 1.97 fl oz (≈ 2 oz) 15 mL Lawn fertilizers, mild pesticides
1:100 1.27 fl oz 10 mL Dilute foliar feeds, light sanitizers
1:128 1.00 fl oz 8 mL Light cleaning solutions

Ratios assume concentrate:water (1:X). Formula: oz/gal = 128 ÷ (1 + X). For exact values at any tank size, use the calculator above.

What is the 2 oz per gallon ratio?

2 oz per gallon equals a 1:63 ratio (concentrate:water), commonly listed as 1:64. For a 1-gallon sprayer: 2 fl oz concentrate + ~126 fl oz water. For a 4-gallon backpack: 8 fl oz concentrate total.

What is the 4 oz per gallon ratio?

4 oz per gallon equals a 1:31 ratio, commonly listed as 1:32. For a 1-gallon sprayer: 4 fl oz (½ cup) concentrate + ~124 fl oz water. For a 4-gallon backpack: 16 fl oz (1 pint) concentrate total — see the Backpack Sprayer Calculator for full tank instructions.

What is the 8 oz per gallon ratio?

8 oz per gallon equals a 1:15 ratio, commonly listed as 1:16. For a 1-gallon sprayer: 8 fl oz concentrate + ~120 fl oz water. For a 4-gallon backpack: 32 fl oz (1 quart) concentrate total.

Hose-end sprayer dilution calculator

Hose-end sprayers work differently from tank sprayers. Instead of mixing concentrate into a tank, you fill the reservoir with undiluted concentrate and let the sprayer siphon and dilute it automatically as water flows through. The dial or setting on the sprayer controls the siphon ratio — how many parts water are mixed with each part concentrate as it passes through the nozzle.

To find the right amount of concentrate for your reservoir, you need two numbers: your sprayer's siphon ratio (from the dial setting) and your product's label rate in oz per gallon. The calculator above handles this — enter your reservoir size as the final volume and the siphon ratio as the ratio value.

Ortho Dial N Spray settings — siphon ratio reference

The Ortho Dial N Spray is the most common hose-end sprayer. Each dial position sets a different siphon ratio. Here is what each setting means in oz of concentrate per gallon of final spray delivered to the target area:

Dial setting Siphon ratio Oz concentrate per gallon delivered Typical use
1 tsp/gal 1:768 0.17 fl oz/gal Very dilute foliar feeds
1 tbsp/gal 1:256 0.50 fl oz/gal Light fertilizers, mild concentrates
2 tbsp/gal 1:128 1.00 fl oz/gal General purpose concentrates
1 oz/gal 1:128 1.00 fl oz/gal General purpose concentrates
1.5 oz/gal 1:85 1.50 fl oz/gal Mid-strength pesticides
2 oz/gal 1:64 1.97 fl oz/gal Standard insecticides, lawn treatments
3 oz/gal 1:43 2.95 fl oz/gal Stronger pesticide rates
4 oz/gal 1:32 3.88 fl oz/gal Standard herbicide rates
6 oz/gal 1:21 5.94 fl oz/gal Higher-rate herbicides
8 oz/gal 1:16 7.53 fl oz/gal Concentrated cleaners, strong herbicides

How to use this table: Find the dial setting that matches your product's label rate in oz per gallon. That setting delivers the correct dilution through the hose-end sprayer. If your label rate falls between two settings, choose the lower setting and apply a second pass rather than over-concentrating.

How to calculate concentrate for a hose-end reservoir

Most Ortho Dial N Spray reservoirs hold 32 fl oz. To find how much of your product's concentrate to fill it with, match your label's oz/gal rate to the dial setting above, then fill the reservoir with undiluted concentrate up to the reservoir capacity — the sprayer handles the dilution automatically as you spray.

If your label gives a ratio instead of oz/gal (e.g., 1:32), use the calculator above: enter your reservoir size as the volume and the ratio value as X. The result tells you how much concentrate to pre-fill the reservoir with before attaching to the hose.

Note: hose-end sprayer output varies with water pressure. For precise applications like pesticides with strict minimum carrier volumes, a backpack sprayer gives more consistent results than a hose-end unit.

Recommended measuring tools

Small ratios like 1:64 require precise measurement — kitchen spoons introduce significant error at low volumes:

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FAQ

How many ounces of concentrate is 1:32 per gallon?

For a 1 gallon final mix, a 1:32 dilution ratio (concentrate:water) is about 3.88 fl oz of concentrate (≈ 115 mL). If your sprayer is 2 gallons, 3 gallons, or a metric tank, use the calculator above for exact values.

How many ounces of concentrate is 1:16 per gallon?

For a 1 gallon final mix, 1:16 is about 7.53 fl oz of concentrate (≈ 223 mL). This is a stronger mix than 1:32 or 1:64 because it uses more concentrate per gallon.

How many ounces of concentrate is 1:64 per gallon?

For a 1 gallon final mix, 1:64 is about 1.97 fl oz of concentrate (≈ 58 mL). This is a weaker dilution than 1:32.

Is 64:1 the same as 1:64?

Not always. Many labels use different ordering. 1:64 commonly means 1 part concentrate to 64 parts water. 64:1 often means 64 parts water to 1 part concentrate. Use the calculator’s ratio format selector to match the label.

Can I convert a mixing ratio to tablespoons, teaspoons, and mL?

Yes. This ratio to ounces calculator also shows approximate conversions to mL, tablespoons (tbsp), and teaspoons (tsp)—handy for small pump sprayers and spray bottles.

Does this replace pesticide label instructions?

No. This page provides mixing math and unit conversions only. Always follow the product label for approved uses, application rates, timing, and safety guidance.

How do I use a hose-end sprayer dilution calculator?

Enter your hose-end sprayer reservoir size as the final volume in the calculator above, and your product's ratio as the ratio value. For Ortho Dial N Spray settings, match the dial position to the oz per gallon rate on your product label using the siphon ratio reference table on this page — it shows what each dial setting delivers in oz of concentrate per gallon of final spray.

How the math works

For a ratio written as 1:X (concentrate:water), the concentrate fraction of the final mix is 1 ÷ (1 + X). Multiply that fraction by your final spray volume to get the concentrate amount. The rest is water.