4 grams of sugar equals 1 teaspoon. There are 3  teaspoons in one tablespoon. 40 grams of sugar equals 10 teaspoons  of sugar. 10 teaspoons of sugar would equal 3 1/3 tables … poons.. gram of sugar is a fraction of a tsp.   One gram of sugar is less than a teaspoonful. It would take four grams of sugar to equal one teaspoon (tsp). 64 people found this useful.