How many teaspoons is 20ml? Leave a Comment / General Greatest Reply One teaspoon is 5ml. There are 4 teaspoons in 20 ml. Read More: What tims is 9pm PST in Central time? How many linear ft in 1 acre? Related posts: Does post mean before or after? How much is one third of 3000? Is coco moco coco lipstick real? How much is one half of a teaspoon in milliliters? What is half of 76? READ: How much is a hundred 20 dollar bills?