Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Approximation: ethanol–water volumes contract on mixing and ABV is temperature-dependent. Not a laboratory alcoholometry method.
Example Calculation
- Initial beverage volume: 500 mL
- Initial ABV: 40 %
- Target ABV: 20 %
500 mL at 40% diluted to 20% requires approximately 500 mL water under the additive-volume model.
Frequently asked questions
How do I use this calculator?
Enter initial beverage volume, initial abv, target abv. The result updates automatically. Use Reset to restore the example values.
What method does it use?
approximate final volume=initial volume × initial ABV/target ABV; water=final−initial.. Approximation: ethanol–water volumes contract on mixing and ABV is temperature-dependent. Not a laboratory alcoholometry method.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.