> The minimum price of alcohol is to be calculated according to the following formula—

> MPU × S × V × 100

> where—

> MPU is the minimum price per unit,

> S is the strength of the alcohol, and

> V is the volume of the alcohol in litres.

It's hard to figure out, but I think "alcohol" actually means "alcoholic beverage" and "strength" means "percentage of alcohol in the alcoholic beverage". So with a MPU of £0.50 and pint (0.56 litres) of 3% alcohol cider, you'd have £.5 × .03 × .56L × 100 = £0.84. So it looks like the "unit" in "minimum price per unit" is "centiliters", although this unit is mentioned literally nowhere in the law.

It's a minimum price per centiliter of pure alcohol in the beverage. That's it.

https://www.nhs.uk/live-well/alcohol-support/calculating-alc...

Units aren't the only confusing thing here.

You need to read it in context. "Alcohol" is quite adequately defined at Licensing Act (Scotland) 2005 s.2: http://www.legislation.gov.uk/asp/2005/16/section/2

s.147 defines strength: "strength", in relation to alcohol, is to be determined in accordance with section 2 of the Alcoholic Liquor Duties Act 1979 (c. 4), thus "the alcoholic strength of any liquor is the ratio of the volume of the alcohol contained in the liquor to the volume of the liquor (inclusive of the alcohol contained in it)".

It's defined in such terms as that makes it easy to calculate - both strength and volume can be looked up from the label of the alcohol. The average person wouldn't know where to start with centiliters of pure alcohol in the beverage. You don't actually need to know what a unit is to calculate it, but it's 10ml of pure alcohol, or 25ml of a 40% spirit (standard sales amount). It'll be familiar to most UK drinkers.

This phrasing frustrates me quite a bit. I assume they're referring to "% concentration of ethanol by volume", but they chose to express it in this obtuse "units" and "strength" nomenclature. (Or is this referring to the "proof" as the strength in their formula? Is that metric used in Scotland?)

If the intent is to communicate to the public, this is not an effective way to do it.

"Units" reduce the complexity to a single number. For most drinks it will be 1, 2 or 3 units. Simple numbers, single digits.

General health advice will state that n units are the maximum recommended per week or day for men or for women. It's a single number to remember. Make sure the drinks you have total less than that maximum number, and you'll be following the recommendations.

The aim here isn't to be scientifically accurate. It's to reduce the problem to its essentials so that the message is clear and simple, and everyone in the entire population can understand it and follow it. By that measure, it's wildly successful.

Units are an unit of measure. It's literally a different name for a centilitre.

> "Units" reduce the complexity to a single number. For most drinks it will be 1, 2 or 3 units. Simple numbers, single digits.

Centilitres reduce the complexity to a single number. For most drinks it would be 1, 2, or 3 centilitres. Simple numbers, single digits.

> General health advice will state that n units are the maximum recommended per week or day for men or for women. It's a single number to remember. Make sure the drinks you have total less than that maximum number, and you'll be following the recommendations.

General health advice will state that n centilitres are the maximum recommended per week or day for men or for women. It's a single number to remember. Make sure the drinks you have total less than that maximum number, and you'll be following the recommendations.

One shot is one unit.

One beer is 2-3 units.

One glass of wine is 2-3 units.

It is very simple maths. The kind you find hard to mess up when drinking.

One shot is one centilitre.

One beer is 2-3 centilitres.

One glass of wine is 2-3 centilitres.

It's not maths at all, it's just communication. There's nothing "simpler" about "unit" than "centilitre", it's just less clear.

It would be like a continental European going to America and going, "What are all these MILES things? It's confusing!".