How to count alcohol units
Combine serving size, strength and the local standard drink.
1
Measure the serving
Use the bottle or glass volume in millilitres.
2
Enter the ABV
Use the strength printed on the label.
3
Pick the system
Choose the country standard that matches the guidance you follow.
What does this tool do?
Countries define a standard drink differently, so the same bottle can show different unit counts. This calculator converts ethanol volume using the US 14 g, UK 8 g and Australian 10 g references.
The Formula
Ethanol (ml) = volume × ABV ÷ 100; standard drinks = ethanol ml ÷ reference volume (US 17.75 ml, UK 10 ml, AU 12.67 ml)Frequently Asked Questions
What is a standard drink?
Definitions vary: the US uses 14 g of pure alcohol, the UK uses 8 g per unit, and Australia uses 10 g. This tool follows the system you select.
Why is the unit count different from the label?
Breweries and bars vary in strength and pour size. Use measured volume and the actual ABV for a better estimate.