how many grams in a teaspoon of baking powder?

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things people ask

• How many grams in a teaspoon of baking powder?
  About 4 g for a level teaspoon. Heaped, you can hit 5-6 g, which is enough to push a delicate cake into over-rising and then sinking. The standard rule of thumb — 1 teaspoon per cup of flour — assumes a level measurement, so drag a straight edge across the spoon before tipping it in.
• How do I test if a teaspoon of baking powder is still active?
  Drop 1 teaspoon (4 g) into about 1/3 cup of hot water. Fresh baking powder fizzes vigorously and immediately. Weak or expired powder sputters or barely reacts, and your cakes will come out flat. The test takes ten seconds and is worth doing on any tin that's been open longer than six months.
• Can I substitute baking soda teaspoon-for-teaspoon for baking powder?
  No. Baking soda is roughly three to four times stronger and needs an acid (buttermilk, yogurt, lemon juice) to activate. To replace 1 teaspoon of baking powder, use about 1/4 teaspoon baking soda plus 1/2 teaspoon cream of tartar — or keep the powder and adjust the recipe's acid balance instead.

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