1 teaspoon of baking powder is a small amount that looks like about half the size of a cherry. When poured into a loose pile, it measures 1.4 in (3.55 cm) wide and 0.587 in (1.49 cm) tall.

In kitchen measures
1 teaspoons
1 tsp · 0.333 tbsp · 0.021 cups
about half the size of a cherry
Baking powder typically ranges 0.85–1.05 g/mL depending on how it's packed. A firmly packed scoop weighs more.