Laboratory calculator • Two-solution mixing & dilution

Universal Two-Solution Mixing and Dilution Calculator

Provide any 4 of the 6 variables; the remaining 2 will be computed. Use any consistent unit system (M, mM, %, mass fraction; volumes in L/mL/µL).

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How it works

  • Leave unknown fields empty (empty means "unknown").
  • 0 is a valid numeric input (e.g., solvent concentration = 0 for water/buffer).
  • For pH, the result uses a linear approximation (educational/rough estimates only).
Worked example
Mix 400 mL of 25% with 100 mL of 15%. Leave Final concentration empty and click Calculate.

Inputs

Solution 1 (Stock)
Use any consistent units (M, %, pH; volumes in L/mL/µL).
Solution 2 (Solvent)
For dilution with solvent, set concentration to 0.

Target (final solution)

Examples

Example 1
Final concentration after mixing 400 mL of 25% with 100 mL of 15%.
Example 2
Mix pH 9.0 with pH 7.0 to reach pH 7.6 (linear approximation).
Example 3
Prepare solution by mixing 100 mL of 0.5 M stock with 200 mL of water.
Example 4
Blend 10% and 5% solutions to obtain 30 gallons of 7% solution.
Example 5
Add 10% solution to 40 gallons of 35% to obtain a 20% solution.
Example 6
Mix 60% and 20% alcohol to produce 20 gallons of 30% alcohol.
Example 7
Mix a 90% gold alloy with an unknown alloy to obtain 30 ounces of 80% gold.
Notes: Concentration units are user-defined but must be consistent. For dilution with solvent, set Solution 2 concentration to 0. For pH, the calculation follows a linear approximation and is intended for educational or rough estimates only.