mixing calculator

What this mixing calculator does

This calculator solves a common problem: you have two liquids with different concentrations and want to mix them to hit a specific target concentration. It works for cleaning solutions, lab prep, hydroponics, nutrient mixes, alcohol dilution, and many other everyday mixing tasks.

You can use any volume unit you like (mL, L, gallons, cups), as long as you use the same unit consistently. The output will match your chosen unit.

How the math works

Mass balance principle

The calculator uses a straightforward concentration balance:

• Total volume: A + B = Final Volume
• Total active content: (A × ConcA) + (B × ConcB) = Final Volume × TargetConc

Solving those equations gives the exact amount of each liquid to combine.

When results are possible (and when they are not)

Your target concentration must sit between the two stock concentrations. For example, if you mix 70% and 0%, you can create anything from 0% to 70%, but not 80%.

• If target is outside the range, no physical mix exists with only those two inputs.
• If both stocks have the same concentration, either every ratio works (if target is identical) or none do.

Practical example

Suppose you need 1000 mL of a 30% solution using 70% stock and 0% diluent:

• Solution A (70%): 428.571 mL
• Solution B (0%): 571.429 mL

Mix those volumes and you’ll land on 1000 mL at 30%.

Tips for accurate mixing

• Measure by weight when possible for higher precision.
• Use clean containers to avoid contamination.
• Mix thoroughly before final use.
• Label concentration and date on prepared solutions.
• For safety-critical chemicals, always verify with official SOPs.

Common use cases

Cleaning and disinfecting

Dilute concentrated cleaners safely to a working strength without guesswork.

Lab and classroom experiments

Prepare repeatable concentrations for titrations, standards, and demonstrations.

DIY and home projects

From nutrient solutions to hobby chemistry, this tool helps reduce waste and improve consistency.