Units:

Men: 3-4 per day

Women: 2-3 per day

You need 2 alcohol free days a week

Strength (%) x Volume (ml)/1000 = Number of units

1 unit is equal to:

½ pint of beer/lager/cider (3.5% abv)

125ml wine (8% abv)

25ml spirits (40% abv)