How many grams of sugar are in cotton candy?

There is about one oz, or 30g, of sugar in one serve of cotton candy. That's around 6 teaspoons US, or 8 teaspoons UK.

Cotton candy (or candy floss, or fairy floss, depending on where in the world you are) is 100 per cent sugar, sometimes with added coloring. One serve contains about 100 calories or .42 kilojoules.