Alligation Calculator (All in One)

Alligation Calculator - Compounding Calculator)

Alligation Calculator for Compounding

🔹 higher concentration

Strength

📦 quantity available g

(leave blank if unlimited)

🔸 lower concentration

Strength

📦 quantity available g

(optional)

🎯 desired concentration

⚖️ type:

🧪 total amount to make

📊 alligation parts —

🧴 higher : 0 💧 lower : 0

higher concentrate

0 g

0 mg

lower concentrate

0 g

0 mg

final mixture

0 g

ⓘ professional use: Alligation works when desired strength is between higher & lower. w/v = weight/volume (g/mL), v/v = volume/volume. mg/g automatically converted to %. Available quantities optional – if insufficient, tool warns. 1 g ≈ 1 mL assumed for w/v liquids. Verify independently.

✔ Verified by Adesh Pundir, RPh – Licensed Pharmacist since 2013
Reviewed for medical accuracy | Updated April 2026

What is alligation method?

The alligation method is a quick math trick used in compounding pharmacies to figure out how to mix two ingredients to get a specific strength. It is a big time-saver when you need to calculate proportions, especially for creams or solutions.

So, you have two strengths of the same cream, right? One is super strong and one is weak. But you need a medium-strength cream. The alligation method is just a super easy trick to figure out how much of each to mix together.

Imagine a simple tic-tac-toe grid. You put the strong number in the top left, the weak number on the bottom left. Your target strength goes in the middle. Then you just subtract on the diagonal. The answers you get are the exact number of “parts” of each cream you need to mix. It makes compounding math way less of a headache.