Alcohol Units in a 25 ml Shot of Spirits (40% ABV)
A single 25 ml measure of spirits at 40% ABV equals exactly 1.0 alcohol unit.
How to use this tool
- Enter volume and abv in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your alcohol units and the full breakdown beneath it.
A standard pub measure of spirits is designed to equal one unit — confirm this with the calculator and see how doubles stack up.
Frequently asked questions
- What is a UK alcohol unit?
- One unit contains 10 ml (8 g) of pure ethanol. A pint of 5% lager = 2.84 units; a 175 ml glass of 13% wine ≈ 2.3 units.
- What is the NHS weekly guideline?
- The NHS recommends not regularly drinking more than 14 units per week, spread over 3 or more days with some alcohol-free days.