How many calories does one skittle have?

weigh one on very accurate digital kitchen scales (if not so accurate to small measures weigh a higher number eg10 then divide by that number eg10) then check packet eg skittles fruits have 403 kcal/100g. if skittle say weighed 2g multiply by 0.02 or 1.7g, 403 x 0.017. If it is easier divide 403 by 100 first then multiply by 2 or 1.7 or whatever can use this method for any food :)