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How many grams is a teaspoon of baking powder?

1 teaspoon of baking powder weighs 4 grams (0.14 oz), according to King Arthur Baking — Ingredient Weight Chart.

Baking powder: cups to grams

AmountGramsOunces
1/4 cup48 g1.7 oz
1/3 cup64 g2.3 oz
1/2 cup96 g3.4 oz
2/3 cup128 g4.5 oz
3/4 cup144 g5.1 oz
1 cup192 g6.8 oz
1 tablespoon12 g0.42 oz
1 teaspoon4 g0.14 oz

US cup = 236.6 ml. Measured level.

FAQ

How many grams is 1/2 cup of baking powder?

1/2 cup of baking powder is about 96 grams, based on 192 g per US cup (King Arthur Baking — Ingredient Weight Chart).

How many grams is 1/4 cup of baking powder?

1/4 cup of baking powder is about 48 grams.

How many ounces is a cup of baking powder?

A US cup of baking powder weighs about 6.8 oz (192 g).

Why weigh instead of using cups?

Cups measure volume, so how you fill them changes how much you get. A kitchen scale gives the same amount every time, which is why bakers weigh.

Source: King Arthur Baking — Ingredient Weight Chart (192 g per US cup). Other amounts are calculated from that figure.