The charity has produced an online alcohol-calorie counter which equates drinks to an easily understandable comparison. For example, a pint of lager has the same calorie count as three chocolate digestive biscuits.
WCRF's Kate Mendoza said: "The calories in alcoholic drinks account for a significant proportion of a drinker's calorie consumption.
"Recent reports have shown that people are unaware of calories in drinks and don't include them when calculating their daily consumption. This is important from a cancer perspective because after smoking, being overweight or obese is the biggest risk factor.
"There is also strong scientific evidence that alcohol itself is a cancer risk factor, possibly through damaging our DNA."