You’ve been to a work do or a birthday party and had a few beers or a few glasses of wine. You’re a bit unsteady on your feet, and not really sure whether you’re OK to drive.

This amazing tool allows you to check your blood-alcohol levels yourself – instead of waiting for the traffic police to do so.

(And don’t be shy to call a taxi if you’re over the limit – it’s a lot less hassle than spending the night in a cell.)

The legal blood alcohol limit in South Africa is 0.05g per 100ml of blood.

number of beers
Glasses of wine
number of cocktails or spirits
Your gender	Female Male
Your weight (kg)
Drinking duration (hrs)
Blood alcohol content	g per 100 ml