How to Use the Dilution Calculator

This calculator helps you mix alcohol solutions to any target concentration — whether you're diluting 91% isopropyl down to 70% for lab work or cutting high-proof ethanol for tinctures.

Choose a mode

• Find water to add — enter your alcohol volume and target ABV, get the water needed.

• Find alcohol to add — enter your water volume and target ABV, get the alcohol needed.

• Find final ABV — enter both volumes and get the resulting concentration.

Enter your concentrations

Enter the ABV of your starting solution and diluent. Pure water stays at 0%. Use the Proof button to switch between ABV and proof — it works independently on each field.

Select your units

Each field has its own unit selector. Mix and match freely.

Reading the results

Results update as you type. The highlighted row is your answer. Toggle contraction on or off at the bottom — this accounts for the small volume loss that occurs when ethanol and water are combined.