0 calories* *0 kcal per teaspoon (g) Splenda® Stevia gets its unique sweetness, without bitter aftertaste, from the delicious Reb D extract from the Stevia leaf. 1 teaspoon Sugar (5 g) 19 calories = 1 teaspoon Splenda® Stevia (5 g) 0 calories Did you know that Stevia is 200 times sweeter than sugar? So a small % of stevia is sufficient to give you the same sweetness as sugar.