Spray Mix Calculators Mixing Ratio Calculator

Mixing Ratio Calculator

Convert any mixing ratio to exact concentrate and water amounts for any container size. Works for herbicides, pesticides, cleaners, and fertilizers. Enter a ratio like 1:32 or 1:64 — get instant fl oz, mL, and tablespoon amounts.

💡 Three tools in one:

  • Mix Calculator — ratio + volume → exact concentrate and water amounts
  • Ratio Finder — know your amounts → find the 1:X ratio and solution strength
  • Batch Scaler — scale any recipe up or down to a new tank size

On this page: Calculator · Common ratio reference table · How mixing ratios work · Related tools · FAQ

Label gives oz per gallon instead of a ratio? Oz Per Gallon Calculator · Full oz/gal reference: Oz Per Gallon Guide · Mixing for a backpack sprayer? Backpack Sprayer Calculator

Calculator

Mixing Ratio Calculator

Use the Mix Calculator tab for ratio → amounts. Switch to Ratio Finder to identify a ratio from known quantities, or Batch Scaler to resize any recipe.

Unit System

Mixing Ratio

Volume to Mix

Multiple Batches (optional)

Tip: Use a measuring syringe for precise small-volume concentrate measurements.

Working from a recipe that gives quantities rather than a ratio — or want to verify a mix you've already made? Enter your amounts below to find the exact 1:X ratio and solution strength.

Unit System

Concentrate Used

Total Finished Volume

Example: what ratio is 4 fl oz in 1 gallon?

Enter 4 fl oz concentrate and 1 gallon total volume. Result: ratio = 128 ÷ 4 − 1 = 1:31 (nearest standard: 1:32), solution strength = 3.1%.

Example: what ratio is 1 tbsp in 32 oz?

Enter 1 tbsp (0.5 fl oz) concentrate and 32 fl oz total volume. Result: ratio = 64 − 1 = 1:63 (nearest standard: 1:64), solution strength = 1.6%.

Use this tab to verify a mix from a recipe, confirm you've hit the right ratio, or identify an unknown dilution when only quantities are known.

Have a working mix for one tank size? Scale it up or down to any other size while keeping the same ratio.

Unit System

Mixing Ratio

Original Batch Size

New Batch Size

Example: scale a 1:32 recipe from 1 gallon to 4 gallons

Label says: 3.88 fl oz concentrate per 1 gallon. Your tank is 4 gallons. Enter ratio 1:32, original volume 1 gal, new volume 4 gal. Result: 15.52 fl oz concentrate + fill to 4 gallons with water. The ratio stays constant — only the quantity changes.

Example: scale a 1:64 recipe from 4 gallons down to a 32 oz bottle

Enter ratio 1:64, original volume 4 gal, new volume 32 fl oz. Result: 0.49 fl oz (≈ 1 tbsp) concentrate + fill to 32 oz with water.

Use this tab when your label is written for a volume that doesn't match your tank — scale up for larger jobs or down for small spot-treatment bottles.

🧪 Measuring small concentrate amounts accurately?
A measuring syringe or graduated cylinder gives you exact fl oz and mL readings every time. See all recommended spray equipment.

Common mixing ratios — quick reference

How much concentrate per gallon and per liter at standard dilution ratios. Use the calculator above for any ratio or container size.

Ratio (1:X) fl oz per gallon mL per liter Strength (%) Typical use
1:4 25.6 fl oz 200 mL 20% Heavy-duty degreasers, high-concentrate cleaners
1:10 11.6 fl oz 90.9 mL 9.1% Strong cleaning concentrates, some high-rate herbicides
1:16 7.6 fl oz 58.8 mL 5.9% High-rate pesticide applications, degreaser concentrates
1:20 6.1 fl oz 47.6 mL 4.8% Fertilizer concentrates, some fungicides
1:32 3.88 fl oz 30.3 mL 3.0% Most common herbicide and pesticide application rate
1:40 3.12 fl oz 24.4 mL 2.4% Mid-range insecticide applications
1:50 2.52 fl oz 19.6 mL 2.0% General-purpose dilution, foliar fertilizers
1:64 1.97 fl oz 15.4 mL 1.5% Light-rate herbicides, multi-surface cleaning solutions
1:100 1.28 fl oz 9.9 mL 1.0% Dilute insecticide sprays, foliar feeds
1:128 1.00 fl oz 7.8 mL 0.78% Products labeled "1 oz per gallon", light sanitizing
1:256 0.50 fl oz 3.9 mL 0.39% Ultra-dilute sanitizers, very light-rate applications

Formula: fl oz per gallon = 128 ÷ (X + 1)  ·  mL per liter = 1000 ÷ (X + 1)

When to use each calculator mode

Mix Calculator — ratio to exact amounts

Use this when your product label gives a ratio (1:32, 1:64, etc.) and you need to know the exact concentrate amount for your specific tank. Enter the ratio value and your total tank volume — the calculator handles the arithmetic and outputs fl oz, mL, and tablespoon/teaspoon equivalents so you can measure without converting mentally.

The multiple batches field is useful for planning a full day's work: enter the number of tank fills you expect and get the total concentrate to measure out in one go before heading to the field — reducing trips back to the concentrate container.

Ratio Finder — identify an unknown ratio

Use this when you know the quantities but not the ratio. Common situations:

The result shows the exact calculated ratio (e.g., 1:31.5), the nearest standard ratio (e.g., 1:32), and the solution percentage — useful for comparing against label efficacy data.

Batch Scaler — resize any recipe proportionally

Use this when your label or instructions are written for a specific volume that doesn't match your tank. This is more common than it might seem:

The scaler keeps the ratio constant and proportionally adjusts all quantities. It handles cross-unit scaling (e.g., a recipe in gallons scaled to a volume entered in fl oz) automatically.

Reading ratio formats on product labels

Labels write ratios in two formats. 1:X (concentrate:water) is the most common US format — "1:32" means 1 part product per 32 parts water. Some labels use X:1 (water:concentrate), reversing the order with identical maths. Others express the rate as "X oz per gallon" — use the Oz Per Gallon Calculator if your label uses that format, or see the full Oz Per Gallon reference guide for every common rate. For help interpreting your specific label's language, see the Label Dilution Guide.

Frequently asked questions

What does a 1:32 mixing ratio mean?

A 1:32 ratio means 1 part concentrate to 32 parts water — 33 parts total finished solution. For a 1-gallon tank (128 fl oz): 128 ÷ 33 = 3.88 fl oz of concentrate, then fill the rest with water. This is one of the most common herbicide and pesticide rates.

How do I convert a mixing ratio to ounces per gallon?

Divide 128 by (ratio + 1). For 1:32: 128 ÷ 33 = 3.88 fl oz/gal. For 1:64: 128 ÷ 65 = 1.97 fl oz/gal. For 1:128: 128 ÷ 129 ≈ 1 fl oz/gal. The Mix Calculator tab handles any ratio and any container size without any manual maths.

What is the difference between 1:32 and 1:64?

A 1:32 mix is twice as concentrated as 1:64. At 1:32 the solution is about 3% concentrate; at 1:64 it's about 1.5%. If your product label gives a range (e.g., 1:32 to 1:64), use the stronger end for heavy infestations and the weaker end for maintenance applications.

How do I scale a mix to a different tank size?

Use the Batch Scaler tab above. Enter your ratio, the original recipe volume, and your actual tank size. The calculator shows the new concentrate and water amounts proportionally — no manual cross-multiplication needed.

How do I find my ratio from a known amount of concentrate?

Use the Ratio Finder tab. Enter how much concentrate you used (in fl oz, tbsp, or tsp) and the total finished volume. The result shows the exact 1:X ratio, the nearest standard ratio, and the percentage concentration.

What mixing ratios are common for herbicides and pesticides?

Most spray applications fall between 1:16 and 1:128. Generic glyphosate typically uses 1:16 to 1:32. Many insecticide concentrates use 1:64 to 1:128. Cleaning concentrates vary widely — from 1:4 for heavy-duty jobs to 1:256 for light sanitizing. Always follow your product label — the label rate overrides any general guideline.

Does it matter whether I add concentrate or water first?

Yes — always add concentrate to the tank first, then fill with water. Pouring water onto concentrate causes excessive foaming and uneven mixing. Add concentrate to a partially filled tank, stir or agitate, then top up to your target volume.