What this calculator does
It converts the label ratio to a common base unit and scales it to the amount of water you want to prepare.
The result tells you how much concentrate to use without changing the label concentration.
Practical / United States
How to use the mixing ratio calculator
Learn how to scale product-label instructions like 2 fl oz per gallon into the amount of concentrate you need for a different batch size.
Who should use it
This is useful for people mixing fertilizer, cleaning concentrate, soap, or car-wash solutions.
It is especially helpful when product labels use US units but you prefer metric amounts.
Inputs
- Concentrate amount: how much concentrate the label uses
- Concentrate unit: ml, liter, teaspoon, tablespoon, fl oz, cup, pint, quart, or gallon
- Water amount: how much water the label uses
- Water unit: the unit used for the label water amount
- Desired water amount: how much water you want to mix
- Output unit: the unit you want for the final concentrate amount
Formula
Concentrate per water = label concentrate amount ÷ label water amount
Needed concentrate = desired water amount × concentrate per water
Then convert the result into your preferred output unit.
Illustration
Example
Label says 2 fl oz of concentrate per 1 gallon of water.
You want to mix 1 liter of water.
The calculator shows about 15.6 ml of concentrate.
Common mistakes
- Mixing up fluid ounces and weight ounces
- Changing the concentration instead of scaling the ratio
- Ignoring the product label or safety instructions
FAQ
- Can I use this for fertilizer? Yes, if you are only scaling the label ratio.
- Can I use this for pesticides? Use extra caution and follow the label exactly.
- Does it support metric units? Yes. You can mix metric and US liquid units.
Safety
- Always follow the product label.
- Do not exceed the label concentration.
- Use proper protective equipment when required.
- Do not use this calculator for medicine, food, or hazardous chemicals.