It varies from drink to drink. In all, however it is one of the biggest ingredients. Remember that the labels on foods tend to list ingredients in order of weight ... typically on blackcurrant drinks the list goes: water, sugar blackcurrants (if you are lucky). Sometimes sugar is the largest ingredient. One brand, I seem to remember, had the equivalent of 10 teaspoons of sugar per half pint of diluted drink. Many are not this high, but all are very sugary unless they are low-sugar brands, which contain less. Either way tend to be bad news for teeth.