Chemistry

Instant, private, and free

Alligation Calculator.

Blend low- and high-concentration sources to reach a target concentration.

On-device calculationNo signup
01

Set your values

Results update as you type.

Low-source parts: 15 parts

Low-source parts

15.000000parts
High-source parts: 15 parts

High-source parts

15.000000parts
Low-source amount: 50 units

Low-source amount

50.000000units
High-source amount: 50 units

High-source amount

50.000000units

Educational formula calculator. Keep units consistent; chemistry procedures, concentrations, and safety decisions require qualified laboratory guidance. Never mix cleaning products.

Use Cases

Formulating products with desired strength

In industries like food, beverage, or cosmetics, you may need to blend two batches with different concentrations to achieve a final product with a target concentration.

Example: Combine a 5% and 15% syrup to make 2 liters of a 10% syrup.

Frequently Asked Questions

Can I use this calculator for any type of solution?
Yes, as long as the concentrations are expressed in the same unit (percent) and the total blend amount is in a consistent unit (e.g., mL, L, grams). The calculator works for any two-component mixture where you know the low and high concentrations and the desired target concentration.
What if my target concentration is outside the range of the low and high concentrations?
The alligation method requires the target concentration to be between the low and high concentrations. If your target is outside this range, the calculator will not produce a valid result. You would need to adjust your source concentrations or choose a different approach.

Tips & Common Mistakes

Tips

  • Ensure the target concentration is between the low and high concentrations; otherwise, the calculation is not valid.
  • Use the same unit for all concentrations (percent) and the same unit for the total blend amount (e.g., mL, L, g) to get correct results.
  • Double-check your inputs: the low concentration must be lower than the high concentration, and the target must be in between.
  • The result gives you the amount of each solution to mix; always mix thoroughly to achieve a uniform concentration.

Common Mistakes to Avoid

  • Entering the low and high concentrations in the wrong order, which can lead to incorrect ratios.
  • Setting the target concentration equal to the low or high concentration, which would require only one component and the other amount becomes zero.
  • Using inconsistent units for the total blend amount (e.g., mixing mL and L) without converting, leading to wrong quantities.

Last updated: August 13, 2026