The drink-driving limit changes at every border you cross, and in most countries a lower figure applies to anyone who passed their test recently. Here are the limits in 31 European countries and the USA, country by country and with sources.
You wake up rested and feel completely normal — and still have alcohol in your blood. Here is how to work out how long alcohol stays in your system after a night out, why neither coffee nor sleep speeds it up, and what the law says the morning after.
A standard drink is a fixed amount of pure alcohol, but the amount depends on where you are: 14 g in the USA, 10 g in Australia, 12 g in Sweden, 8 g for a UK unit. Here are the sizes by country, the formula for any drink, and what a beer, a glass of wine or a shot actually adds up to.
Your blood alcohol level can be estimated from four things: how much alcohol you drank, your weight, your sex and the time since you started. Here is the Widmark formula that does it, worked through step by step, and how Mypromille uses it.