Calculator Input
Example Data Table
These sample rows show common dilution targets for chemistry and formulation work.
| Sample | Start Volume | Source Proof | Target Proof | Theoretical Water Added | Theoretical Final Volume |
|---|---|---|---|---|---|
| Lab Blend A | 1.000 L | 190 | 80 | 1.375 L | 2.375 L |
| Lab Blend B | 500 mL | 160 | 100 | 300 mL | 800 mL |
| Extract Prep C | 750 mL | 120 | 70 | 535.71 mL | 1285.71 mL |
| Pilot Batch D | 2.000 L | 151 | 90 | 1.3556 L | 3.3556 L |
Formula Used
The main dilution model uses conservation of ethanol:
C1 × V1 = C2 × V2
- C1 = starting alcohol concentration as ABV fraction.
- V1 = starting liquid volume.
- C2 = target alcohol concentration as ABV fraction.
- V2 = final theoretical volume after dilution.
From that relation:
Final Volume = (Starting Volume × Source ABV) ÷ Target ABV
Water To Add = Final Volume − Starting Volume
US proof is converted with Proof = 2 × ABV, so ABV = Proof ÷ 2. The practical volume estimate reduces theoretical volume by the chosen contraction percentage.
How to Use This Calculator
- Enter a batch name for identification.
- Choose the starting volume and the matching measurement unit.
- Enter the source alcohol strength in proof or ABV.
- Enter the lower target strength you want after dilution.
- Add an optional contraction estimate for more realistic volume results.
- Enter a reference temperature if you want a documented batch note.
- Press Calculate Dilution to show the result block above the form.
- Use the CSV or PDF buttons to export the example table or the current result summary.
Frequently Asked Questions
1. What does alcohol proof mean here?
In this calculator, US proof equals twice the ABV percentage. A liquid at 40% ABV is 80 proof.
2. Why must the target strength be lower?
Dilution means adding water to reduce concentration. If your target is equal to or higher than the source, no valid dilution exists.
3. Why are theoretical and practical volumes different?
Alcohol and water can contract slightly when mixed. The practical figure subtracts an estimated contraction loss to reflect that behavior.
4. Can I use ABV instead of proof?
Yes. You can enter both source and target strengths as ABV or proof. The calculator converts each value automatically.
5. Which volume units are supported?
The calculator supports milliliters, liters, fluid ounces, and gallons. Internally, it converts values through liters for consistency.
6. Does temperature change the exact result?
Yes, temperature can influence density and measured volume. This version records temperature as a reference note, not as a density correction.
7. Can this help with lab documentation?
Yes. It stores the batch name, notes, calculated outputs, and exportable summaries, which helps organize repeatable preparation records.
8. Is this suitable for every formulation standard?
It is useful for planning and estimation. For regulated or high-precision work, confirm results with calibrated measurements and applicable standards.